Elastic properties of calcium oxide perovskites

Nancy L. Ross, Ross J. Angel, Hui-Chen Kung, Tracey D. Chaplin

Research output: Contribution to journalConference article

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
Publication statusPublished - 2002 Jan 1
EventPerovskite Materials - San Francisco, CA, United States
Duration: 2002 Apr 12002 Apr 5

Fingerprint

calcium oxides
perovskites
Lime
elastic properties
Elastic moduli
bulk modulus
Equations of state
Density (specific gravity)
Perovskite
stiffening
Vacancies
Anisotropy
Single crystals
Oxygen
X ray diffraction
equations of state
trends
anisotropy
lime
single crystals

All Science Journal Classification (ASJC) codes

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

Cite this

Ross, Nancy L. ; Angel, Ross J. ; Kung, Hui-Chen ; Chaplin, Tracey D. / Elastic properties of calcium oxide perovskites. In: Materials Research Society Symposium - Proceedings. 2002 ; Vol. 718. pp. 115-119.
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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{\%}.",
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Elastic properties of calcium oxide perovskites. / Ross, Nancy L.; Angel, Ross J.; Kung, Hui-Chen; Chaplin, Tracey D.

In: Materials Research Society Symposium - Proceedings, Vol. 718, 01.01.2002, p. 115-119.

Research output: Contribution to journalConference article

TY - JOUR

T1 - Elastic properties of calcium oxide perovskites

AU - Ross, Nancy L.

AU - Angel, Ross J.

AU - Kung, Hui-Chen

AU - Chaplin, Tracey D.

PY - 2002/1/1

Y1 - 2002/1/1

N2 - 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%.

AB - 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%.

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