Title :
Elastic properties of relaxors with magnetic ordering
Author :
Smirnova, E. ; Sotnikov, A. ; Ktitorov, S. ; Zaitseva, N. ; Schmidt, Heidemarie ; Weihnacht, M.
Author_Institution :
Ioffe Phys.-Tech. Inst., St. Petersburg, Russia
Abstract :
The longitudinal and transverse acoustic wave velocities in PbFexB1-xO3 (B = Ta, Nb, W) ceramics have been measured by the ultrasonic pulse-echo technique at a frequency of 10 MHz in a wide temperature range from 4.2 K to 500 K. Temperature dependences of the longitudinal and transverse elastic constants were obtained. The softening of the elastic coefficients at phase transitions is discussed within the framework of the phenomenological theory taking into account electrostrictive and magnetostrictive couplings.
Keywords :
acoustic pulses; acoustic wave velocity; ceramics; elastic constants; electrostriction; iron compounds; lead compounds; magnetostriction; relaxor ferroelectrics; ultrasonic materials testing; ultrasonic measurement; PbFexB1-xO3 ceramics; PbFexNb1-xO3; PbFexTa1-xO3; PbFexW1-xO3; elastic coefficient softening; elastic properties; electrostrictive couplings; frequency 10 MHz; longitudinal acoustic wave velocity; longitudinal elastic constants; magnetic ordering; magnetostrictive couplings; phase transitions; phenomenological theory; relaxors; temperature 4.2 K to 500 K; transverse acoustic wave velocity; transverse elastic constants; ultrasonic pulse-echo technique; Acoustics; Magnetoacoustic effects; Magnetostriction; Temperature dependence; Temperature distribution; Temperature measurement;
Conference_Titel :
Ultrasonics Symposium (IUS), 2012 IEEE International
Conference_Location :
Dresden
Print_ISBN :
978-1-4673-4561-3
DOI :
10.1109/ULTSYM.2012.0373
