Relaxor behavior of ferroelectric Ca_(0.22)Sr_(0.12)Ba_(0.66)Nb_2O_6

摘要

The relaxor behavior of tetragonal tungsten bronze uniaxial relaxor ferroelectric calcium strontium barium niobate (Ca_(0.22)Sr_(0.12)Ba_(0.66)Nb_2O_6 or CSBN-22) single crystal was studied by measuring elastic constants and thermal expansion with the aid of resonant ultrasound spectroscopy and dilatometry, respectively, in the temperature range 300K-1503K. Thermal expansion yields evidence of the Burns temperature T_B and the intermediate characteristic temperature T*, which was also supported by the temperature evolutions of the elastic constants c_(ij). CSBN-22 was found to be ～2%~3% elastically stiffer than CBN-28. The presented results open the perspective to understand the relaxor behavior of CSBN.