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Negative thermal expansion in high pressure layered perovskite Ca2GeO4
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Chen, Wei-Tin, Ablitt, Chris, Bristowe, Nicholas C., Mostofi, Arash A., Saito, Takashi, Shimakawa, Yuichi and Senn, Mark S. (2019) Negative thermal expansion in high pressure layered perovskite Ca2GeO4. Chemical Communications, 55 (20). pp. 2984-2987. doi:10.1039/C8CC09614G
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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 Comput. Mater., 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: | Journal Article | ||||||||||||||||||||||||
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| Subjects: | Q Science > QC Physics Q Science > QE Geology |
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| Divisions: | Faculty of Science > Chemistry | ||||||||||||||||||||||||
| Library of Congress Subject Headings (LCSH): | Perovskite -- Thermal properties, Expansion (Heat) | ||||||||||||||||||||||||
| Journal or Publication Title: | Chemical Communications | ||||||||||||||||||||||||
| Publisher: | Royal Society of Chemistry | ||||||||||||||||||||||||
| ISSN: | 1359-7345 | ||||||||||||||||||||||||
| Official Date: | 20 February 2019 | ||||||||||||||||||||||||
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| Date of first compliant deposit: | 26 April 2019 | ||||||||||||||||||||||||
| Volume: | 55 | ||||||||||||||||||||||||
| Number: | 20 | ||||||||||||||||||||||||
| Page Range: | pp. 2984-2987 | ||||||||||||||||||||||||
| DOI: | 10.1039/C8CC09614G | ||||||||||||||||||||||||
| Status: | Peer Reviewed | ||||||||||||||||||||||||
| Publication Status: | Published | ||||||||||||||||||||||||
| Access rights to Published version: | Open Access | ||||||||||||||||||||||||
| RIOXX Funder/Project Grant: |
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