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@article{Mostofi:2019:10.1039/c8cc09614g,
author = {Mostofi, A and Ablitt, C and Bristowe, N and Senn, M and Saito, T and Shimakawa, Y and Chen, W-T},
doi = {10.1039/c8cc09614g},
journal = {Chemical Communications},
pages = {2984--2987},
title = {Negative thermal expansion in high pressure layered perovskite Ca2GeO4},
url = {http://dx.doi.org/10.1039/c8cc09614g},
volume = {55},
year = {2019}
}

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TY  - JOUR
AB  - 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.
AU  - Mostofi,A
AU  - Ablitt,C
AU  - Bristowe,N
AU  - Senn,M
AU  - Saito,T
AU  - Shimakawa,Y
AU  - Chen,W-T
DO  - 10.1039/c8cc09614g
EP  - 2987
PY  - 2019///
SN  - 1359-7345
SP  - 2984
TI  - Negative thermal expansion in high pressure layered perovskite Ca2GeO4
T2  - Chemical Communications
UR  - http://dx.doi.org/10.1039/c8cc09614g
UR  - http://hdl.handle.net/10044/1/67223
VL  - 55
ER  -

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