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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

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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
Subjects: Q Science > QC Physics
Q Science > QE Geology
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
Dates:
DateEvent
20 February 2019Available
23 January 2019Accepted
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:
Project/Grant IDRIOXX Funder NameFunder ID
MOST-106-2112-M-002-021-MY3Ministry of Science and Technology of Thailandhttp://dx.doi.org/10.13039/501100007275
2017-88Institute for Chemical Research, Kyoto Universityhttp://dx.doi.org/10.13039/501100010697
Core-to-Core Program (A) Advanced Research Networks[JSPS] Japan Society for the Promotion of Sciencehttp://dx.doi.org/10.13039/501100001691
2017-3-298National Synchrotron Radiation Research Center (NSRRC, Taiwan)UNSPECIFIED
UF160265[RS] Royal Societyhttp://dx.doi.org/10.13039/501100000288
EP/L015579/1[EPSRC] Engineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266
EP/P020194/1[EPSRC] Engineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266

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