Elastic properties of calcium oxide perovskites

Nancy L. Ross, Ross J. Angel, Jennifer Kung, Tracey D. Chaplin

Research output: Contribution to journalConference articlepeer-review

5 Citations (Scopus)

Abstract

The equations of state and axial moduli of the CaBO3 perovskites (B=Zr,Sn,Ti,Ge) and CaFeO2.5 with the brownmillerite structure have been determined using high-pressure, single-crystal X-ray diffraction. The bulk modulus-specific volume relationship for the Ca-perovskites is nonlinear, with CaSnO3 and CaZrO3 displaying anomalous stiffening (higher bulk moduli) than previously reported and predicted [1,2]. The axial moduli of the a- and c-axes decrease steadily by ∼30% from the least-distorted of the Pbnm perovskites, CaGeO3, to the most distorted, CaZrO3, while the b-axis shows little change. The net result is a threefold increase in the anisotropy of the axial moduli of CaSnO3 and CaZrO3 (∼21%) relative to CaGeO3 and CaTiO3 (∼ 4-8%). The bulk modulus of CaFeO2.5 falls significantly below the trend for the stoichiometric perovskites. The introduction of 1/6 vacancies, on the oxygen positions softens the perovskite structure by 25%.

Original languageEnglish
Pages (from-to)115-119
Number of pages5
JournalMaterials Research Society Symposium - Proceedings
Volume718
DOIs
Publication statusPublished - 2002 Jan 1
EventPerovskite Materials - San Francisco, CA, United States
Duration: 2002 Apr 12002 Apr 5

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Fingerprint Dive into the research topics of 'Elastic properties of calcium oxide perovskites'. Together they form a unique fingerprint.

Cite this