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Issue 20, 2019
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Negative thermal expansion in high pressure layered perovskite Ca2GeO4

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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.

Graphical abstract: Negative thermal expansion in high pressure layered perovskite Ca2GeO4

  • This article is part of the themed collection: Perovskites
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Article information


Submitted
03 Dec 2018
Accepted
23 Jan 2019
First published
20 Feb 2019

This article is Open Access

Chem. Commun., 2019,55, 2984-2987
Article type
Communication

Negative thermal expansion in high pressure layered perovskite Ca2GeO4

W. Chen, C. Ablitt, N. C. Bristowe, A. A. Mostofi, T. Saito, Y. Shimakawa and M. S. Senn, Chem. Commun., 2019, 55, 2984
DOI: 10.1039/C8CC09614G

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