Title :
The temperature dependence of sound velocities, elastic constants and acoustic attenuation of lead lanthanum zirconate titanate (Pb,La)(Zr,Ti)O3
Author :
Wu, A.Y. ; Nicolaides, G. ; Hwang, D.M.
Author_Institution :
Dept. of Phys., Illinois Univ., Chicago, IL, USA
fDate :
30 Aug-2 Sep 1992
Abstract :
Sound velocities, elastic constants, and acoustic attenuation in PLZT (lead lanthanum zirconate titanate) 9/65/35 bulk ceramic material have been determined by ultrasonic techniques between 1.2 and 470 K. Anomalous elastic behavior, including a broad dip in sound velocity and a sharp cusp in attenuation, was observed around the diffuse phase transition at 330 K. The sound velocity increases strongly and linearly with decreasing temperature at low temperatures. This behavior is different from that predicted by the Debye lattice model. An unusually large (42%) discrepancy between the elastic Debye temperature and the calorimetric Debye temperature was found and can be attributed to the nature of the disorderness in this ceramic material
Keywords :
Debye temperature; ceramics; elastic constants; ferroelectric materials; lanthanum compounds; lattice dynamics of ferroelectric crystals; lead compounds; ultrasonic absorption; 1.2 to 470 K; Debye lattice model; PLZT; PbLaZrO3TiO3; acoustic attenuation; calorimetric Debye temperature; diffuse phase transition; disorderness; elastic Debye temperature; elastic constants; ferroelectric material; sound velocities; temperature dependence; Attenuation; Bonding; Ceramics; Ferroelectric materials; Lanthanum; Lead; Temperature dependence; Titanium compounds; Ultrasonic transducers; Velocity measurement;
Conference_Titel :
Applications of Ferroelectrics, 1992. ISAF '92., Proceedings of the Eighth IEEE International Symposium on
Conference_Location :
Greenville, SC
Print_ISBN :
0-7803-0465-9
DOI :
10.1109/ISAF.1992.300719
