Journal
CHEMICAL COMMUNICATIONS
Volume 55, Issue 20, Pages 2984-2987Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8cc09614g
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Funding
- Ministry of Science and Technology (Taiwan) [MOST-106-2112-M-002-021-MY3]
- Collaborative Research Program of Institute for Chemical Research, Kyoto University [2017-88]
- Japan Society for the Promotion of Science (JSPS) Core-to-Core Program (A) Advanced Research Networks
- National Synchrotron Radiation Research Center (NSRRC, Taiwan) [2017-3-298]
- Royal Society University Research Fellowship [UF160265]
- EPSRC [EP/L015579/1, EP/P020194/1]
- EPSRC [EP/P020194/1] Funding Source: UKRI
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We report the high pressure synthesis of a layered perovskite Ca2GeO4 which is found to have the Ruddlesden-Popper structure with I4(1)/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.
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