Random electric field strength distribution in lead-free relaxor ferroelectrics caused by barium content

Abstract

Curie temperature behavior of BaxSr[Formula: see text]TiO3 ferroelectrics ceramic ([Formula: see text]) in dependence on bias field is detected by means of acoustic emission. Curie temperature exhibits nontrivial V-shape effect with threshold field of 0.3[Formula: see text]kV/cm, equivalent to random electric fields strength. This random field strength is compared with those in BaxSr[Formula: see text]TiO3 relaxor ferroelectrics ([Formula: see text], 0.7, 0.8) obtained previously, as well as with those determined from mean domain sizes in BaxSr[Formula: see text]Nb2O6 relaxor ferroelectrics ([Formula: see text], 0.39, 0.6). It is estimated that the random field strength of Ba[Formula: see text]Sr[Formula: see text]TiO3 is 30 times stronger than those of Ba[Formula: see text]Sr[Formula: see text]Nb2O6 and it is shown that the random field strengths of both BaxSr[Formula: see text]TiO3 and BaxSr[Formula: see text]Nb2O6 obey the same exponential law in dependence on barium content.