Oxide perovskites: pressure derivatives of the bulk and shear moduli

Abstract The pressure derivatives of elastic moduli (∂M/∂P; M=KS and G) for a suite of polycrystalline oxide perovskites (2 titanates, 1 stannate and 2 aluminates) have been measured up to 3 GPa using the ultrasonic interferometry method combined with a buffer rod technique. Two empirical systematic...

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Bibliographic Details
Published inPhysics and chemistry of minerals Vol. 26; no. 3; pp. 234 - 241
Main Authors Kung, J., Rigden, S.
Format Journal Article
LanguageEnglish
Published Heidelberg Springer Nature B.V 01.02.1999
Subjects
Aluminates
Derivatives
Enstatite
Interferometry
Modulus of elasticity
Perovskites
Shear modulus
Systematics
Titanates
Trends
Ultrasonic testing
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Summary:Abstract The pressure derivatives of elastic moduli (∂M/∂P; M=KS and G) for a suite of polycrystalline oxide perovskites (2 titanates, 1 stannate and 2 aluminates) have been measured up to 3 GPa using the ultrasonic interferometry method combined with a buffer rod technique. Two empirical systematic relationships (∂G/∂P vs KS/G and ∂KS/∂P vs KS (/ρ)1/3) have been used to investigate the elasticity systematics of this suite of perovskites and to estimate ∂M/∂P of MgSiO3 perovskite. The pressure derivatives ∂G/∂P and ∂KS/∂P for this suite of perovskites scatter between well-defined linear trends for the rutile, rocksalt and spinel structures. The more diffuse trends observed for the perovskites might reflect greater flexibility in the response of its corner-connected octahedral framework structure to changing pressure. The pressure derivatives of the elastic moduli for MgSiO3 perovskite estimated by the “perovskite bands” are ∂G/∂P=1.6–2.2 and ∂KS/∂P=3.9–4.2.
ISSN:0342-1791
1432-2021
DOI:10.1007/s002690050182