Abstract
Dielectric spectra of high-temperature piezoelectric (1−x)BiScO3–xPbTiO3 of composition near the morphotropic phase boundary (x≅0.64) were investigated in the frequency range of 100 Hz–1 THz at temperatures between 10 and 900 K. Below the ferroelectric phase transition Tc≅700 K, in addition to polar phonons, two other polarization mechanisms were detected: one, centered in the 100 MHz–1 GHz range probably caused by sound generation due to ferroelectric-ferroelastic domain wall motion; another evidences dynamic disorder of some ions. The former process, characterized by the temperature-independent mean relaxation time, vanishes below ∼250 K. The latter mechanism, caused by compositional disorder, results in the nearly frequency-independent losses (1/f noise) at low temperatures.
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