Numéro |
J. Phys. IV France
Volume 06, Numéro C8, Décembre 1996
ICIFUAS 11Eleventh International Conference on Internal Friction and Ultrasonic Attenuation in Solids |
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Page(s) | C8-687 - C8-690 | |
DOI | https://doi.org/10.1051/jp4:19968149 |
Eleventh International Conference on Internal Friction and Ultrasonic Attenuation in Solids
J. Phys. IV France 06 (1996) C8-687-C8-690
DOI: 10.1051/jp4:19968149
Mechanical Loss and Elastic Modulus Associated with Phase Transitions in PLZT Ceramics
B.L. Cheng1, M. Gabbay2, M. Gimenez3 and G. Fantozzi21 Department of Physics, South China University of Technology, Guangzhou 510641, China
2 GEMPPM, UMR 5510 du CNRS, INSA Lyon, Bât. 502, 69621 Villeurbanne, France
3 Depto. Fisica de Los Materiales, UNED, Ciudad Universitaria, 28040 Madrid, Spain
Abstract
The phase transition in lanthanum modified lead zirconate-titanate ceramic of 6/60/40 is studied by mechanical loss Q-1 and elastic modulus measurements. The shear elastic modulus measured from 50°C to 250°C shows that the Curie temperature is located at 180°C for the transition from cubic to rhombohedral phase. The Q-1 curves at low frequencies show clearly a peak corresponding to such phase transition. This phase transition is confirmed by measurements of Young's modulus and Q-1 using resonance curve technique from -100°C to 300°C at kilohertz. Moreover, between 50°C and 90°C, the resonance curve recorded at kHz frequency shows two resonance peaks. Such existence of double peaks means that a phase transition takes place between two rhombohedral phases FE2 and FE1 in the ferroelectric state. These phase transitions are also studied by DSC measurement.
© EDP Sciences 1996