Elastic properties of calcium oxide perovskites

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

doi:10.1557/proc-718-d2.4

Elastic properties of calcium oxide perovskites

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

Department of Earth Sciences

Research output: Contribution to journal › Conference article › peer-review

5 Citations (Scopus)

Abstract

The equations of state and axial moduli of the CaBO₃ perovskites (B=Zr,Sn,Ti,Ge) and CaFeO_2.5 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 CaFeO_2.5 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 language	English
Pages (from-to)	115-119
Number of pages	5
Journal	Materials Research Society Symposium - Proceedings
Volume	718
DOIs	https://doi.org/10.1557/proc-718-d2.4
Publication status	Published - 2002
Event	Perovskite Materials - San Francisco, CA, United States Duration: 2002 Apr 1 → 2002 Apr 5

All Science Journal Classification (ASJC) codes

General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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10.1557/proc-718-d2.4

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@article{34b05068ee2447919015b8afb8856f28,

title = "Elastic properties of calcium oxide perovskites",

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%.",

author = "Ross, {Nancy L.} and Angel, {Ross J.} and Jennifer Kung and Chaplin, {Tracey D.}",

year = "2002",

doi = "10.1557/proc-718-d2.4",

language = "English",

volume = "718",

pages = "115--119",

journal = "Materials Research Society Symposium - Proceedings",

issn = "0272-9172",

publisher = "Materials Research Society",

note = "Perovskite Materials ; Conference date: 01-04-2002 Through 05-04-2002",

}

TY - JOUR

T1 - Elastic properties of calcium oxide perovskites

AU - Ross, Nancy L.

AU - Angel, Ross J.

AU - Kung, Jennifer

AU - Chaplin, Tracey D.

PY - 2002

Y1 - 2002

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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U2 - 10.1557/proc-718-d2.4

DO - 10.1557/proc-718-d2.4

M3 - Conference article

AN - SCOPUS:0036452614

SN - 0272-9172

VL - 718

SP - 115

EP - 119

JO - Materials Research Society Symposium - Proceedings

JF - Materials Research Society Symposium - Proceedings

T2 - Perovskite Materials

Y2 - 1 April 2002 through 5 April 2002

ER -

Elastic properties of calcium oxide perovskites

Abstract

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