Author(s) Yuan, H.; Rodriguez-Hernandez, P.; Muñoz, A.; Errandonea, D.
Journal J Phys Chem Lett
Date Published 2019 Aug 15

We have studied by means of X-ray diffraction and Raman spectroscopy the high-pressure behavior of PbCrO nanorods. We have found that these nanorods follow a distinctive structural sequence that differs from that of bulk PbCrO. In particular, a phase transition from a monoclinic monazite-type PbCrO to a novel monoclinic AgMnO-type polymorph has been discovered at 8.5 GPa. The crystal structure, Raman-active phonons, and compressibility of this novel high-pressure phase are reported for the first time. The experimental findings are supported by ab initio calculations that provide information not only on structural and vibrational properties of AgMnO-type PbCrO but also on the electronic properties. The discovered phase transition triggers a band gap collapse and a subsequent metallization at 44.2 GPa, which has not been observed in bulk PbCrO. This suggests that nanoengineering can be a useful strategy to drive metallization under compression.

DOI 10.1021/acs.jpclett.9b01978
ISSN 1948-7185
Citation J Phys Chem Lett. 2019;10(16):47444751.

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