GeSbTeis a crystalline solid used as a semiconductor and in photo optic applications.American Elements produces to many standard grades when applicable, including Mil Spec (military grade); ACS, Reagent and Technical Grade; Food, Agricultural and Pharmaceutical Grade; Optical Grade, USP and EP/BP (European Pharmacopoeia/British Pharmacopoeia)and follows applicable ASTM testing standards.Typical and custom packaging is available. Additional technical, research and safety (MSDS) information is available as is a Reference Calculator for converting relevant units of measurement.
Germanium is a Block P, Group 14, Period 4 element. The number of electrons in each of Germanium's shells is 2, 8, 18, 4 and its electronic configuration is [Ar] 3d10 4s2 4p2. In its elemental form germanium's CAS number is 7440-56-4. The germanium atom has a radius of 122.5.pm and it's Van der Waals radius is 200.pm. Germanium is not toxic. Germanium is a very important semiconductor. Zone-refining techniques have led to production of crystalline germanium for semiconductor use with extremely high purities. When germanium is doped with arsenic, gallium, or other elements, it is used as a transistor element in thousands of electronic applications. The most common use of germanium is as a semiconductor. Germanium is also finding many other applications including use as an alloying agent, as a phosphor in fluorescent lamps, and as a catalyst. Germanium and germanium oxide are transparent to the infrared and are used in infrared spectroscopes and other optical equipment, including extremely sensitive infrared detectors. The high refractive index and dispersion properties of its oxide's have made germanium useful as a component of wide-angle camera lenses and microscope objectives. The field of organo-germanium chemistry is becoming increasingly important. Germanium was first discovered by Clemens Winkler in 1886. See Germanium research below.
Antimony is a Block P, Group 15, Period 5 element. The number of electrons in each of Antimony's shells is 2, 8, 18, 18, 5 and its electronic configuration is [Kr] 4d10 5s2 5p3. In its elemental form antimony's CAS number is 7440-36-0. The antimony atom has a radius of 145.pm and it's Van der Waals radius is 200.pm. The chemical state of antimony affects the toxicity of the element and its compounds. Antimony is finding use in semiconductor technology for making infrared detectors, diodes and Hall-effect devices in crystalline structures, such as antimony telluride and gallium antimonide. Antimony is however a poor conductor of heat and electricity. It greatly increases the hardness and mechanical strength of lead. This has found applications in batteries, antifriction alloys, small arms and tracer bullets and cable sheathing. Antimony compounds are used in manufacturing flame-proofing compounds, paints, ceramic enamels, glass, and pottery glazes. Antimony is available as metal and compounds with purities from 99% to 99.9999% (ACS grade to ultra-high purity); metals in the form of foil, sputtering target, and rod, and compounds as submicron and nanopowder. See Antimony research below.
Tellurium is a Block P, Group 16, Period 5 element. The number of electrons in each of Tellurium's shells is 2, 8, 18, 18, 6 and its electronic configuration is [Kr] 4d10 5s2 5p4. In its elemental form tellurium's CAS number is 13494-80-9. Tellurium is very toxic and can cause birth defects. The tellurium atom has a radius of 143.2.pm and it's Van der Waals radius is 206.pm. Tellurium is a p-type semiconductor, and shows greater conductivity in certain directions, depending on alignment of the atoms. It is grown in crystalline form with other elements such as indium telluride. Its conductivity increases slightly with exposure to light which makes many tellurides candidates for solar energyapplications. Tellurium improves the machinability of copper and stainless steel, and its addition to lead decreases the corrosive action of sulfuric acid on lead and improves its strength and hardness. Tellurium is used as a basic ingredient in blasting caps, and is added to cast iron for chill control. Tellurium is used in ceramics. Bismuth telluride has been used in thermoelectric devices. Iron is available as metal and compounds with purities from 99% to 99.999% (ACS grade to ultra-high purity); metals in the form of foil, sputtering target, and rod, and compounds as submicron and nanopowder. Tellurium was first discovered by Franz Muller von Reichenstein in 1782. The name Tellurium originates from the Greek word 'Tellus' meaning Earth. See Tellurium research below.
American Elements semi conducting materials are crystal structures produced from ultra high purity starting materials synthesized by our high purity production facility which includes several large electric muffle furnaces, a tube furnace for hydrogen reduction, 50 gallon glass-lined Pfaudler reactors supported by our analytical laboratory containing X-ray diffraction, SEM, AA, BET surface area, and ICP Spectrometry for trace metals analysis. See a discussion of American Elements Ultra High Purity and Analytical capabilities. See Crystal Growth for processes used to fabricate semiconductor materials, which include:
Crystal "pulling" by the Czochaiski method for production of semiconductor materials
Flux growth and gradient freeze
Directional solidification of fluorites using both the Bridgman-Stockbarger and float zoning techniques
Synthesis of Mixed Tin-Ruthenium and Tin-Germanium-Ruthenium Carbonyl Clusters from [Ru(3)(CO)(12)] and Diaminometalenes (M = Sn, Ge).
Cabeza JA, García-Álvarez P, Polo D.
Inorg Chem. 2012 Jan 11. [Epub ahead of print]
PMID:
22235838
[PubMed - as supplied by publisher]
RADIOACTIVITY RISK ASSOCIATED WITH THE HANDLING OF COMPACT FLUORESCENT LAMPS.
Medhat ME, Eissa HS, Elmaghraby EK, Abu Khadra SA.
Radiat Prot Dosimetry. 2012 Jan 9. [Epub ahead of print]
PMID:
22232775
[PubMed - as supplied by publisher]
Synthesis of Nanoamorphous Germanium and Its Transformation to Nanocrystalline Germanium.
Dag O, Henderson EJ, Ozin GA.
Small. 2012 Jan 9. doi: 10.1002/smll.201101993. [Epub ahead of print]
PMID:
22228493
[PubMed - as supplied by publisher]
Synthesis and structural characterization of two-coordinate low-valent 14-group metal complexes bearing bulky bis(amido)silane ligands.
Yang D, Guo J, Wu H, Ding Y, Zheng W.
Dalton Trans. 2012 Jan 5. [Epub ahead of print]
PMID:
22218706
[PubMed - as supplied by publisher]
Compositional Differences between Size Classes of Dissolved Organic Matter from Freshwater and Seawater Revealed by an HPLC-FTIR System.
Tremblay L, Landry C.
Environ Sci Technol. 2012 Jan 4. [Epub ahead of print]
PMID:
22216934
[PubMed - as supplied by publisher]
Soft Lithographic Functionalization and Patterning Oxide-free Silicon and Germanium.
Bowers CM, Toone EJ, Clark RL, Shestopalov AA.
J Vis Exp. 2011 Dec 16;(58). pii: 3478. doi: 10.3791/3478.
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The ARRONAX Project.
Haddad F, Barbet J, Chatal JF.
Curr Radiopharm. 2011 Jul 1;4(3):186-96.
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22201708
[PubMed - in process]
Metastable Ge1-xCx Alloy Nanowires.
Kim BS, Lee JH, Son K, Hwang SW, Choi BL, Lee EK, Kim JM, Whang D.
ACS Appl Mater Interfaces. 2011 Dec 27. [Epub ahead of print]
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22201458
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Reactivity of Digermylenes toward Potassium Graphite: Synthesis and Characterization of Germylidenide Anions.
Chia SP, Yeong HX, So CW.
Inorg Chem. 2012 Jan 16;51(2):1002-10. Epub 2011 Dec 21.
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22188525
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Optics of semiconductors from meta-generalized-gradient-approximation-based time-dependent density-functional theory.
Nazarov VU, Vignale G.
Phys Rev Lett. 2011 Nov 18;107(21):216402. Epub 2011 Nov 15.
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22181900
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Active microwave negative-index metamaterial transmission line with gain.
Jiang T, Chang K, Si LM, Ran L, Xin H.
Phys Rev Lett. 2011 Nov 11;107(20):205503. Epub 2011 Nov 11.
PMID:
22181744
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Mesoporous zinc germanium oxynitride for CO(2) photoreduction under visible light.
Zhang N, Ouyang S, Kako T, Ye J.
Chem Commun (Camb). 2012 Jan 9;48(9):1269-71. Epub 2011 Dec 16.
PMID:
22179125
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In Situ X-ray Absorption Spectroscopy Study of Si(1-x)Ge(x)O(2) Dissolution and Germanium Aqueous Speciation under Hydrothermal Conditions.
Ranieri V, Haines J, Cambon O, Levelut C, Le Parc R, Cambon M, Hazemann JL.
Inorg Chem. 2012 Jan 2;51(1):414-9. Epub 2011 Dec 16.
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22175278
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Open-shell complexes containing metal-germanium triple bonds.
Filippou AC, Barandov A, Schnakenburg G, Lewall B, van Gastel M, Marchanka A.
Angew Chem Int Ed Engl. 2012 Jan 16;51(3):789-93. doi: 10.1002/anie.201107120. Epub 2011 Dec 15.
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22173926
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A review of recent developments in the speciation and location of arsenic and selenium in rice grain.
Carey AM, Lombi E, Donner E, de Jonge MD, Punshon T, Jackson BP, Guerinot ML, Price AH, Meharg AA.
Anal Bioanal Chem. 2011 Dec 8. [Epub ahead of print]
PMID:
22159463
[PubMed - as supplied by publisher]
Electrodeposition of germanium from supercritical fluids.
Ke J, Bartlett PN, Cook D, Easun TL, George MW, Levason W, Reid G, Smith D, Su W, Zhang W.
Phys Chem Chem Phys. 2012 Jan 4;14(4):1517-28. Epub 2011 Dec 12.
PMID:
22158943
[PubMed - in process]
Gamma-ray fast-timing coincidence measurements from the (18)O+(18)O fusion-evaporation reaction using a mixed LaBr(3)-HPGe array.
Alharbi T, Mason PJ, Regan PH, Podolyák Z, Marginean N, Nakhostin M, Bowry M, Bucurescu D, Cata-Danil G, Cata-Danil I, Deleanu D, Filipescu D, Glodariu T, Ghita D, Marginean R, Mihai C, Negret A, Pascu S, Sava T, Stroe L, Suliman G, Zamfir NV, Bruce AM, Rodriguez Triguero C, Bender PC, Garg U, Erduran MN, Kusoglu A, Bostan M, Detistov P, Alkhomashi N, Sinha AK, Chakrabarti R, Ghugre SS.
Appl Radiat Isot. 2011 Dec 3. [Epub ahead of print]
PMID:
22154387
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Mesoporous Nitrogen-Doped Carbon-Glass Ceramic Cathodes for Solid-State Lithium-Oxygen Batteries.
Kichambare P, Rodrigues S, Kumar J.
ACS Appl Mater Interfaces. 2011 Dec 14. [Epub ahead of print]
PMID:
22148159
[PubMed - as supplied by publisher]
Synthesis, Structure, Chemical Bonding, and Magnetism of the Series RELiGe(2) (RE = La-Nd, Sm, Eu).
Bobev S, You TS, Suen NT, Saha S, Greene R, Paglione J.
Inorg Chem. 2012 Jan 2;51(1):620-8. Epub 2011 Dec 6.
PMID:
22145852
[PubMed - in process]
Inducing novel electronic properties in <112> Ge nanowires by means of variations in their size, shape and strain: a first-principles computational study.
Zhang C, De Sarkar A, Zhang RQ.
J Phys Condens Matter. 2012 Jan 11;24(1):015301. Epub 2011 Dec 2.
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22133518
[PubMed - in process]
Synthesis of four different antimony(III) O,O'-dialkyldithiophosphates: Characterization by (31)P CP/MAS NMR, single-crystal X-ray diffraction, and adsorption at a stibnite surface (Sb(2)S(3)).
Larsson AC, Ivanov MA, Gerasimenko AV, Ivanov AV.
J Colloid Interface Sci. 2011 Nov 6. [Epub ahead of print]
PMID:
22115160
[PubMed - as supplied by publisher]
Sensing of Aqueous Fluoride Anions by Cationic Stibine-Palladium Complexes.
Wade CR, Ke IS, Gabbaď FP.
Angew Chem Int Ed Engl. 2011 Nov 24. doi: 10.1002/anie.201106242. [Epub ahead of print]
PMID:
22113959
[PubMed - as supplied by publisher]
Electrical characterization of n/p-type nickel silicide/silicon junctions by Sb segregation.
Jun M, Park Y, Hyun Y, Choi SJ, Zyung T, Jang M.
J Nanosci Nanotechnol. 2011 Aug;11(8):7339-42.
PMID:
22103191
[PubMed - in process]
Hydride generation in-atomizer collection atomic absorption spectrometry for the determination of antimony in acetic acid leachates from pewter cups.
Dessuy MB, Kratzer J, Vale MG, Welz B, Dedina J.
Talanta. 2011 Dec 15;87:255-61. Epub 2011 Oct 17.
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22099676
[PubMed - in process]
Electrical and optical performance of transparent conducting oxide films deposited by electrostatic spray assisted vapour deposition.
Hou X, Choy KL, Liu JP.
J Nanosci Nanotechnol. 2011 Sep;11(9):8114-9.
PMID:
22097539
[PubMed - in process]
Biomolecule-assisted green route to Sb2S3 crystals with three-dimensional dandelionlike patterns.
Xiang W, Ji G, Wei J, Yang Y, Yuan H, Liu X.
J Nanosci Nanotechnol. 2011 Sep;11(9):7820-32.
PMID:
22097493
[PubMed - in process]
Use of antimony in the treatment of leishmaniasis: current status and future directions.
Haldar AK, Sen P, Roy S.
Mol Biol Int. 2011;2011:571242. Epub 2011 Jun 8.
PMID:
22091408
[PubMed - in process]
Comparison between one day and two days protocols for sentinel node mapping of breast cancer patients.
Ali J, Alireza R, Mostafa M, Naser FM, Bahram M, Ramin S.
Hell J Nucl Med. 2011 Sep;14(3):313-5.
PMID:
22087458
[PubMed - in process]
Identification of Gunshot Residues in Fabric Targets Using Sector Field Inductively Coupled Plasma Mass Spectrometry Technique and Ternary Graphs*
Freitas JC, Sarkis JE, Neto ON, Viebig SB.
J Forensic Sci. 2011 Nov 10. doi: 10.1111/j.1556-4029.2011.01956.x. [Epub ahead of print]
PMID:
22074259
[PubMed - as supplied by publisher]
MAP Kinase1 of Leishmania Donovani: Down Regulation Associates With Antimony Resistance in Field Isolates.
Ashutosh, Garg M, Sundar S, Duncan R, Nakhasi HL, Goyal N.
Antimicrob Agents Chemother. 2011 Nov 7. [Epub ahead of print]
PMID:
22064540
[PubMed - as supplied by publisher]
Use of carbon nanotubes and electrothermal atomic absorption spectrometry for the speciation of very low amounts of arsenic and antimony in waters.
López-García I, Rivas RE, Hernández-Córdoba M.
Talanta. 2011 Oct 30;86:52-7. Epub 2011 Aug 27.
PMID:
22063510
[PubMed - in process]
Frequency of use controls chemical leaching from drinking-water containers subject to disinfection.
Andra SS, Makris KC, Shine JP.
Water Res. 2011 Dec 15;45(20):6677-87. Epub 2011 Oct 12.
PMID:
22040714
[PubMed - in process]
Antimony leaching from MSWI bottom ash: Modelling of the effect of pH and carbonation.
Cornelis G, Gerven TV, Vandecasteele C.
Waste Manag. 2011 Oct 27. [Epub ahead of print]
PMID:
22035902
[PubMed - as supplied by publisher]
Discovery of Safe and Orally Effective 4-Aminoquinaldine Analogues as Apoptotic Inducers with Activity against Experimental Visceral Leishmaniasis.
Palit P, Hazra A, Maity A, Vijayan RS, Manoharan P, Banerjee S, Mondal NB, Ghoshal N, Ali N.
Antimicrob Agents Chemother. 2011 Oct 24. [Epub ahead of print]
PMID:
22024817
[PubMed - as supplied by publisher]
Bone marrow leishmaniasis: a review of situation in Thailand.
Wiwanitkit V.
Asian Pac J Trop Med. 2011 Oct;4(10):757-9.
PMID:
22014727
[PubMed - in process]
Spectroelectrochemistry of cytochrome c and azurin immobilized in nanoporous antimony-doped tin oxide.
Kwan P, Schmitt D, Volosin AM, McIntosh CL, Seo DK, Jones AK.
Chem Commun (Camb). 2011 Dec 7;47(45):12367-9. Epub 2011 Oct 20.
PMID:
22011849
[PubMed - in process]
Structural diversity for phosphine complexes of stibenium and stibinidenium cations.
Chitnis SS, Peters B, Conrad E, Burford N, McDonald R, Ferguson MJ.
Chem Commun (Camb). 2011 Nov 8;47(45):12331-3. Epub 2011 Oct 20.
PMID:
22011846
[PubMed - in process]
Pressure-induced disordered substitution alloy in sb(2)te(3).
Zhao J, Liu H, Ehm L, Chen Z, Sinogeikin S, Zhao Y, Gu G.
Inorg Chem. 2011 Nov 21;50(22):11291-3. Epub 2011 Oct 18.
PMID:
22007692
[PubMed - in process]
Electrospun antimony doped tin oxide (ATO) nanofibers as a versatile conducting matrix.
Ostermann R, Zieba R, Rudolph M, Schlettwein D, Smarsly BM.
Chem Commun (Camb). 2011 Nov 28;47(44):12119-21. Epub 2011 Oct 14.
PMID:
22003493
[PubMed - in process]
Multi-metal(loid) methylation in methanoarchaea is linked to central intermediates of methanogenesis.
Thomas F, Diaz-Bone RA, Wuerfel O, Huber B, Weidenbach K, Schmitz RA, Hensel R.
Appl Environ Microbiol. 2011 Oct 14. [Epub ahead of print]
PMID:
22003009
[PubMed - as supplied by publisher]
Multi-metal(loid) methylation in methanoarchaea is linked to central intermediates of methanogenesis.
Thomas F, Diaz-Bone RA, Wuerfel O, Huber B, Weidenbach K, Schmitz RA, Hensel R.
Appl Environ Microbiol. 2011 Oct 14. [Epub ahead of print]
PMID:
22003009
[PubMed - as supplied by publisher]
Synthesis, structure, and bonding of orthorhombic r(5)au(2)te(2) (R = lu, ho, dy, y). Electronic structure of the binary parent valence compound eu(5)as(4).
Chai P, Corbett JD.
Inorg Chem. 2011 Nov 7;50(21):10949-55. Epub 2011 Oct 12.
PMID:
21991925
[PubMed - in process]
Glucose-6-Phosphate Dehydrogenase Protects Escherichia coli from Tellurite-Mediated Oxidative Stress.
Sandoval JM, Arenas FA, Vásquez CC.
PLoS One. 2011;6(9):e25573. Epub 2011 Sep 30.
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21984934
[PubMed - in process]
Microbial processing of tellurium as a tool in biotechnology.
Turner RJ, Borghese R, Zannoni D.
Biotechnol Adv. 2011 Sep 1. [Epub ahead of print]
PMID:
21907273
[PubMed - as supplied by publisher]
Measurement of the ?? Decay Half-Life of ^{130}Te with the NEMO-3 Detector.
Arnold R, Augier C, Baker J, Barabash AS, Basharina-Freshville A, Blondel S, Bongrand M, Broudin-Bay G, Brudanin V, Caffrey AJ, Chapon A, Chauveau E, Durand D, Egorov V, Flack R, Garrido X, Grozier J, Guillon B, Hubert P, Hugon C, Jackson CM, Jullian S, Kauer M, Klimenko A, Kochetov O, Konovalov SI, Kovalenko V, Lalanne D, Lamhamdi T, Lang K, Liptak Z, Lutter G, Mamedov F, Marquet Ch, Martin-Albo J, Mauger F, Mott J, Nachab A, Nemchenok I, Nguyen CH, Nova F, Novella P, Ohsumi H, Pahlka RB, Perrot F, Piquemal F, Reyss JL, Richards B, Ricol JS, Saakyan R, Sarazin X, Simard L, Simkovic F, Shitov Y, Smolnikov A, Söldner-Rembold S, Stekl I, Suhonen J, Sutton CS, Szklarz G, Thomas J, Timkin V, Torre S, Tretyak VI, Umatov V, Vála L, Vanyushin I, Vasiliev V, Vorobel V, Vylov Ts, Zukauskas A; NEMO-3 Collaboration.
Phys Rev Lett. 2011 Aug 5;107(6):062504. Epub 2011 Aug 4.
PMID:
21902318
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Synthesis and characterization of wurtzite ZnTe nanorods with controllable aspect ratios.
Zhang J, Jin S, Fry HC, Peng S, Shevchenko E, Wiederrecht GP, Rajh T.
J Am Chem Soc. 2011 Oct 5;133(39):15324-7. Epub 2011 Sep 12.
PMID:
21899348
[PubMed - in process]
A homometallic tricapped cubane cluster: [(Cp*Mo)4B4H4(?4-BH)3] (Cp* = ?5-C5Me5).
Thakur A, Sahoo S, Ghosh S.
Inorg Chem. 2011 Sep 5;50(17):7940-2. Epub 2011 Aug 11.
PMID:
21834507
[PubMed - in process]
Selective antimicrobial activity associated with sulfur nanoparticles.
Schneider T, Baldauf A, Ba LA, Jamier V, Khairan K, Sarakbi MB, Reum N, Schneider M, Röseler A, Becker K, Burkholz T, Winyard PG, Kelkel M, Diederich M, Jacob C.
J Biomed Nanotechnol. 2011 Jun;7(3):395-405.
PMID:
21830480
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Bioactivity of the conjugation of green-emitting CdTe quantum dots with a carborane complex.
Wu C, Shi L, Li Q, Zhao J, Selke M, Yan H, Wang X.
J Nanosci Nanotechnol. 2011 Apr;11(4):3091-9.
PMID:
21776675
[PubMed - indexed for MEDLINE]
Isolation and characterization of an environmental cadmium- and tellurite-resistant Pseudomonas strain.
Chien CC, Jiang MH, Tsai MR, Chien CC.
Environ Toxicol Chem. 2011 Oct;30(10):2202-7. doi: 10.1002/etc.620. Epub 2011 Aug 10.
PMID:
21766319
[PubMed - in process]
An ultrasensitive hydrogen peroxide biosensor based on electrocatalytic synergy of graphene-gold nanocomposite, CdTe-CdS core-shell quantum dots and gold nanoparticles.
Gu Z, Yang S, Li Z, Sun X, Wang G, Fang Y, Liu J.
Anal Chim Acta. 2011 Sep 2;701(1):75-80. Epub 2011 Jul 4.
PMID:
21763811
[PubMed - indexed for MEDLINE]
Synchronous determination of mercury (II) and copper (II) based on quantum dots-multilayer film.
Ma Q, Ha E, Yang F, Su X.
Anal Chim Acta. 2011 Sep 2;701(1):60-5. Epub 2011 Jun 17.
PMID:
21763809
[PubMed - indexed for MEDLINE]
Procedure-Controlled Selective Synthesis of 5-Acyl-2-iminothiazolines and their Selenium and Tellurium Derivatives by Convergent Tandem Annulation.
Wang Y, Zhang WX, Wang Z, Xi Z.
Angew Chem Int Ed Engl. 2011 Jul 14. doi: 10.1002/anie.201101948. [Epub ahead of print] No abstract available.
PMID:
21761522
[PubMed - as supplied by publisher]
Synthesis, structures and ab initio studies of selenium and tellurium bis(carbodithioates and carbothioates).
Kato S, Tani K, Ishida M, Nonogaki J, Ebihara M, Hayashi S, Nakanishi W, Niyomura O, Ando F, Koketsu J.
Dalton Trans. 2011 Aug 28;40(32):8156-69. Epub 2011 Jul 13.
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Electrical bistability in self-assembled hybrid multilayers of phospholipid and nanoparticles.
Yuan B, Hu SX, Lu NY, Xu F, Zhou K, Ma YQ, Li M.
Nanotechnology. 2011 Aug 5;22(31):315303. Epub 2011 Jul 12.
PMID:
21747161
[PubMed - indexed for MEDLINE]
Organomercury(II) and tellurium(II) compounds with the "pincer" ligand 2,6-[O(CH2CH2)2NCH2]2C6H3--stabilization of an unusual organotellurium(II) cationic species.
Beleaga A, Bojan VR, Pöllnitz A, Rat CI, Silvestru C.
Dalton Trans. 2011 Sep 21;40(35):8830-8. Epub 2011 Jul 11.
PMID:
21743935
[PubMed - in process]
Differentiation between the motor and sensory fascicles of the peripheral nerves from adult rats using annexin V-CdTe-conjugated polymer.
Meng X, Lu L, Wang H, Liu B.
Neurol India. 2011 May-Jun;59(3):333-8.
PMID:
21743158
[PubMed - indexed for MEDLINE]
Tellurium tetrachloride and diphenyl ditelluride cause cytotoxicity in rat hippocampal astrocytes.
Roy S, Hardej D.
Food Chem Toxicol. 2011 Oct;49(10):2564-74. Epub 2011 Jul 1.
PMID:
21742007
[PubMed - in process]
Germanium is a Block P, Group 14, Period 4 element. The number of electrons in each of Germanium's shells is 2, 8, 18, 4 and its electronic configuration is [Ar] 3d10 4s2 4p2. In its elemental form germanium's CAS number is 7440-56-4. The germanium atom has a radius of 122.5.pm and it's Van der Waals radius is 200.pm. Germanium is not toxic. Germanium is a very important semiconductor. Zone-refining techniques have led to production of crystalline germanium for semiconductor use with extremely high purities. When germanium is doped with arsenic, gallium, or other elements, it is used as a transistor 
element in thousands of electronic 
Antimony is a Block P, Group 15, Period 5 element. The number of electrons in each of Antimony's shells is 2, 8, 18, 18, 5 and its electronic configuration is [Kr] 4d10 5s2 5p3. In its elemental form antimony's CAS number is 7440-36-0. The antimony atom has a radius of 145.pm and it's Van der Waals radius is 200.pm. The chemical state of antimony affects the toxicity of the element and its
compounds. Antimony is finding use in semiconductor technology for making infrared detectors, diodes and Hall-effect devices in crystalline structures, such as antimony telluride and gallium antimonide. Antimony is however a poor conductor of heat and electricity. It greatly increases the hardness and mechanical strength of lead.
This has found applications in batteries, antifriction alloys, small arms and tracer bullets and cable sheathing. Antimony compounds are used in manufacturing flame-proofing compounds, paints, ceramic enamels, glass, and pottery glazes. Antimony is available as metal and compounds with purities from 99% to 99.9999% (ACS grade to ultra-high purity); metals in the form of foil, sputtering target, and rod, and compounds as submicron and nanopowder. See Antimony research below.
Tellurium is a Block P, Group 16, Period 5 element. The number of electrons in each of Tellurium's shells is 2, 8, 18, 18, 6 and its electronic configuration is [Kr] 4d10 5s2 5p4. In its elemental form tellurium's CAS number is 13494-80-9. Tellurium is very toxic and can cause birth defects. The tellurium atom has a radius of 143.2.pm and it's Van der Waals radius is 206.pm. Tellurium is a p-type semiconductor, and shows greater conductivity in certain directions, depending on alignment of the atoms. It is grown in crystalline form with other elements such as indium telluride. Its conductivity increases slightly with exposure to light which makes many tellurides candidates for solar energyapplications. Tellurium improves the machinability of copper and stainless steel, and its addition to lead decreases the corrosive action of sulfuric acid on lead and improves its strength and hardness. Tellurium is used as 
a basic ingredient in blasting caps, and is added to cast iron for chill control. Tellurium is used in ceramics. Bismuth telluride has been used in thermoelectric devices. Iron is available as metal and compounds with purities from 99% to 99.999% (ACS grade to ultra-high purity); metals in the form of foil, sputtering target, and rod, and compounds as submicron and nanopowder. Tellurium was first discovered by Franz Muller von Reichenstein in 1782. The name Tellurium originates from the Greek word 'Tellus' meaning Earth. See Tellurium research below.
