Abstract
ABSTRACTThis work presents experimental investigation of the low-temperature dielectric and ultrasonic responses of (Ba1−xSrx)TiO3 ceramics with high strontium concentration compositions, x > 0.825. Impedance spectroscopy measurements were performed at frequencies between 0.1 kHz and 100 kHz, and the results were correlated to those obtained with ultrasonic measurements. The anomalies observed in ultrasonic data were associated to ferroelastic and ferroelectric phase transitions. For x = 0.875 the “pinching” of ferroelectric phase transitions was observed. A brief discussion associates some peaks in the ultrasonic attenuation to anomalies in the dielectric response at temperatures below phase transition.
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