Inverse analysis of giant macroscopic negative thermal expansion of Ca2RuO4%y ceramics based on elasticity and structural topology optimization

Akihiro Takezawa, Koshi Takenaka, Xiaopeng Zhang

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

Ca2RuO4%y ceramics exhibit a large volumetric negative thermal expansions (NTE), although the crystallographic volume contraction on heating is much smaller than the NTE. Therefore, we examine the differences in the mechanisms underlying the volumetric thermal expansion for ruthenate ceramics and crystals in the context of the elasticity. We identify the possible microstructure of ruthenate ceramics composed of crystal grains and cavities using structural topology optimization. We conclude that the measured large volumetric NTE of ruthenate ceramics is certainly possible via anisotropic crystallographic thermal expansion through an elastic mechanism.

Original languageEnglish
Article number055801
JournalApplied Physics Express
Volume11
Issue number5
DOIs
Publication statusPublished - 2018 May
Externally publishedYes

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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