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Elastic constants and Debye temperature of polycrystalline Y1Ba2Cu3O7−x

Published online by Cambridge University Press:  31 January 2011

H. M. Ledbetter ,
M. W. Austin ,
S. A. Kim  and
Ming Lei
H. M. Ledbetter
Affiliation:
Fracture and Deformation Division, Institute for Materials Science and Engineering, National Bureau of Standards, Boulder, Colorado 80303
M. W. Austin
Affiliation:
Fracture and Deformation Division, Institute for Materials Science and Engineering, National Bureau of Standards, Boulder, Colorado 80303
S. A. Kim
Affiliation:
Fracture and Deformation Division, Institute for Materials Science and Engineering, National Bureau of Standards, Boulder, Colorado 80303
Ming Lei
Affiliation:
Fracture and Deformation Division, Institute for Materials Science and Engineering, National Bureau of Standards, Boulder, Colorado 80303
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Abstract

Using ultrasonic methods, the quasi-isotropic elastic stiffnesses of void-containing Y1Ba2Cu3O7−x were determined By a composite-material model, these were corrected to the void-free state. From these, the Debye characteristic temperature was calculated. All the elastic stiffnesses fall well below those of polycrystalline BaTiO3, an approximate crystalstructural building block of Y1Ba2Cu3O7−x. The low apparent stiffness may result from oxygen vacancies, which soften interionic forces. Also, it may result from microcracks, which reduce elastic stiffness without lowering mass density.

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Type
Articles
Information
Journal of Materials Research , Volume 2 , Issue 6 , December 1987 , pp. 786 - 789
Copyright
Copyright © Materials Research Society 1987

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