Rare-Earth Zirconate LnZrO (Ln: La, Nd, Gd, and Dy) Powders, Xerogels, and Aerogels: Preparation, Structure, and Properties.

Author(s) Torres-Rodriguez, J.; Gutierrez-Cano, V.; Menelaou, M.; Kaštyl, J.; Cihlář, J.; Tkachenko, S.; González, J.A.; Kalmár, J.; Fábián, I.; Lázár, I.; Čelko, L.; Kaiser, J.
Journal Inorg Chem
Date Published 2019 Nov 04

The physicochemical properties of rare-earth zirconates can be tuned by the rational modification of their structures and phase compositions. In the present work, La-, Nd-, Gd-, and Dy-zirconate nanostructured materials were prepared by different synthetic protocols, leading to powders, xerogels, and, for the first time, monolithic aerogels. Powders were synthesized by the co-precipitation method, while xerogels and aerogels were synthesized by the sol-gel technique, followed by ambient and supercritical drying, respectively. Their microstructures, thermogravimetric profiles, textural properties, and crystallographic structures are reported. The co-precipitation method led to dense powders ( < 1 m g), while the sol-gel technique resulted in large surface area xerogels ( = 144 m g) and aerogels ( = 168 m g). In addition, the incorporation of lanthanide ions into the zirconia lattice altered the crystal structures of the powders, xerogels, and aerogels. Single-phase pyrochlores were obtained for LaZrO and NdZrO powders and xerogels, while defect fluorite structures formed in the case of GdZrO and DyZrO. All aerogels contain a mixture of cubic and tetragonal ZrO phases. Thus, a direct effect is shown between the drying conditions and the resulting crystalline phases of the nanostructured rare-earth zirconates.

DOI 10.1021/acs.inorgchem.9b01965
ISSN 1520-510X
Citation Inorg Chem. 2019;58(21):1446714477.

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