Critical temperature below the Curie temperature of ferroelectric ceramics PZT

D. V. Kuzenko

doi:10.1142/S2010135X21500065

Abstract

The article presents the results of research the pre-transitional features of the behavior of solid solutions based on lead zirconate-titanate. The presence of a “special” critical temperature

T_{d}

on the temperature dependences of the permittivity

𝜀 (T)

and the remanent polarization

P_{r} (T)

, preceding the temperature of the paraelectric phase transition at the Curie temperature

T_{C}

, is noted. In the temperature range

T

<

T_{d}

, the

P_{r} (T)

dependence obeys a power law. In the temperature range

T_{d}

<

T

<

T_{C}

, this law is not fulfilled. The results of X-ray experiments make it possible to associate this behavior with reversible disordering at

T

<

T_{d}

of an ordered domain structure formed during the polarization of piezoelectric ceramics and with its irreversible disordering in the temperature range

T_{d}

<

T

<

T_{C}

. This is due to the appearance of internal mechanical stresses in a polycrystalline ferroelectric due to irreversible depolarization of the samples at temperatures

T_{d}

<

T

<

T_{C}

.The article presents the results of research the pre-transitional features of the behavior of solid solutions based on lead zirconate-titanate. The presence of a “special” critical temperature

T_{d}