Curie temperature behavior of BaxSr1-xTiO3 ferroelectrics ceramic (x=0.9) in dependence on bias field is detected by means of acoustic emission. Curie temperature exhibits nontrivial V-shape effect with threshold field of 0.3kV/cm, equivalent to random electric fields strength. This random field strength is compared with those in BaxSr1-xTiO3 relaxor ferroelectrics (x=0.6, 0.7, 0.8) obtained previously, as well as with those determined from mean domain sizes in BaxSr1-xNb2O6 relaxor ferroelectrics (x=0.25, 0.39, 0.6). It is estimated that the random field strength of Ba0.6Sr0.4TiO3 is 30 times stronger than those of Ba0.6Sr0.4Nb2O6 and it is shown that the random field strengths of both BaxSr1-xTiO3 and BaxSr1-xNb2O6 obey the same exponential law in dependence on barium content.
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- Relaxor ferroelectrics
- acoustic emission
- polar nanoregions
- random electric fields