Chen, Wei-Tin, Ablitt, Chris, Bristowe, Nicholas C., Mostof, Arash A., Saito, Takashi, Shimakawa, Yuichi, Senn, Mark S. (2019) Negative thermal expansion in high pressure layered perovskite Ca2GeO4. Chemical Communications, 55 (20). pp. 2984-2987. ISSN 1359-7345. E-ISSN 1364-548X. (doi:10.1039/c8cc09614g) (KAR id:71785)
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Official URL: http://dx.doi.org/10.1039/c8cc09614g |
Abstract
We report the high pressure synthesis of a layered perovskite Ca2GeO4 which is found to have the Ruddlesden–Popper structure with I41/acd symmetry. Consonant with
our recent predictions [Ablitt et al., npj Computational Materials, 2017, 3, 44], the phase displays pronounced uniaxial negative thermal expansion over a large temperature range. Negative thermal expansion that persists over a large temperature range is very unusual in the perovskite structure, and its occurrence in this instance can be understood to arise due to both soft lattice vibrations associated with a phase competition and the unusually compliant nature of this structure, which effectively couples thermal expansion in the layer plane to lattice contractions perpendicular to the layering direction via a “corkscrew” mechanism.
Item Type: | Article |
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DOI/Identification number: | 10.1039/c8cc09614g |
Subjects: | Q Science > QD Chemistry |
Divisions: | Divisions > Division of Natural Sciences > Physics and Astronomy |
Depositing User: | Nicholas Bristowe |
Date Deposited: | 23 Jan 2019 13:03 UTC |
Last Modified: | 04 Jul 2023 10:46 UTC |
Resource URI: | https://kar.kent.ac.uk/id/eprint/71785 (The current URI for this page, for reference purposes) |
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