Jump to main content
Jump to site search
PLANNED MAINTENANCE Close the message box

Scheduled maintenance work on Wednesday 27th March 2019 from 11:00 AM to 1:00 PM (GMT).

During this time our website performance may be temporarily affected. We apologise for any inconvenience this might cause and thank you for your patience.


Issue 20, 2019
Previous Article Next Article

Negative thermal expansion in high pressure layered perovskite Ca2GeO4

Author affiliations

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
Back to tab navigation

Supplementary files

Publication details

The article was received on 03 Dec 2018, accepted on 23 Jan 2019 and first published on 20 Feb 2019


Article type: Communication
DOI: 10.1039/C8CC09614G
Citation: Chem. Commun., 2019,55, 2984-2987
  • Open access: Creative Commons BY license
  •   Request permissions

    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

    This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. Material from this article can be used in other publications provided that the correct acknowledgement is given with the reproduced material.

    Reproduced material should be attributed as follows:

    • For reproduction of material from NJC:
      [Original citation] - Published by The Royal Society of Chemistry (RSC) on behalf of the Centre National de la Recherche Scientifique (CNRS) and the RSC.
    • For reproduction of material from PCCP:
      [Original citation] - Published by the PCCP Owner Societies.
    • For reproduction of material from PPS:
      [Original citation] - Published by The Royal Society of Chemistry (RSC) on behalf of the European Society for Photobiology, the European Photochemistry Association, and RSC.
    • For reproduction of material from all other RSC journals:
      [Original citation] - Published by The Royal Society of Chemistry.

    Information about reproducing material from RSC articles with different licences is available on our Permission Requests page.

Search articles by author

Spotlight

Advertisements