Skip to main content
Kent Academic Repository

Negative thermal expansion in high pressure layered perovskite Ca2GeO4

Chen, Wei-Tin, Ablitt, Chris, Bristowe, Nicholas C., Mostof, Arash A., Saito, Takashi, Shimakawa, Yuichi, Senn, Mark S. (2019) Negative thermal expansion in high pressure layered perovskite Ca2GeO4. Chemical Communications, 55 (20). pp. 2984-2987. ISSN 1359-7345. E-ISSN 1364-548X. (doi:10.1039/c8cc09614g) (KAR id:71785)

PDF Publisher pdf
Language: English

Download this file
[thumbnail of c8cc09614g.pdf]
Request a format suitable for use with assistive technology e.g. a screenreader
PDF Author's Accepted Manuscript
Language: English

Restricted to Repository staff only
Contact us about this Publication
[thumbnail of Ca2GeO4_accepted.pdf]
Official URL:


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 Computational Materials, 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: Article
DOI/Identification number: 10.1039/c8cc09614g
Subjects: Q Science > QD Chemistry
Divisions: Divisions > Division of Natural Sciences > Physics and Astronomy
Depositing User: Nicholas Bristowe
Date Deposited: 23 Jan 2019 13:03 UTC
Last Modified: 04 Jul 2023 10:46 UTC
Resource URI: (The current URI for this page, for reference purposes)

University of Kent Author Information

Bristowe, Nicholas C..

Creator's ORCID:
CReDIT Contributor Roles:
  • Depositors only (login required):

Total unique views for this document in KAR since July 2020. For more details click on the image.