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Ultrasonic Attenuation Peaks Near the Diffuse Transition Temperature in Solid Electrolytes with Fluorite Structure

Published online by Cambridge University Press:  21 February 2011

M. O. Manasreh,
D. O. Pederson and
T. S. Aurora
M. O. Manasreh
Affiliation:
Air Force Wright Aeronautical Laboratories, Materials Laboratory (AFWAL/MLPO), Wright-Patterson Air Force Base, Ohio 45433-6533
D. O. Pederson
Affiliation:
Department of Physics, University of Arkansas, Fayetteville, Arkansas 72701
T. S. Aurora
Affiliation:
Department of Mathematics and Physics, Philadelphia College of Pharmacy and Science, Philadelphia, PA 19104
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Abstract

Measurements of the ultrasonic attenuation and velocity have been made in solid electrolytes with fluorite structure, PbF2, BaF2, and CdF2, from room temperature to temperature at or above the diffuse solid electrolyte transition temperature, Tc. The ultrasonic attenuation peaks observed in this class of materials are associated only with the ionic conductivity saturation rather than in combination with crystallographic phase transition found in many other solid electrolytes. The relaxation rates and Arrhenius activation energies for anion motion above the transition temperature were obtained from the temperature dependence of the ultrasonic attenuation and the theory of local site fluctuations. The ultrasonic attenuation peaks observed for the first time in CdF2was used to define the diffuse transition temperature in this material. An Anomalous peak is also observed in the linear thermal expansion coefficient of PbF2.

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Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 135: Symposium M – Solid State Ionics I , 1988, 309
Copyright
Copyright © Materials Research Society 1989

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