Thermodynamic background and the effects of the degradation of the modified lead titanate

Abstract

Thermodynamic background and the effects of the degradation of the modified lead titanate

Andryushina I.N., Shilkina L.A., Reznichenko L.A., Andryushin K.P., Razumovskaya O.N.

Incoming article date: 14.05.2015

The paper provides information on the influence of thermodynamic prehistory (conditions for obtaining) and the processes associated with time "aging" of the samples in the dielectric properties of the alkaline-earth elements modified lead titanate ceramics. The data shows a dielectric stability of solid solutions (SS) with a high content of alkaline-earth elements (almost independently of the Curie temperature of sintering temperature). This is supported by the fact of reproduction the character of dielectric spectra in SS (α1≥0.22) unlike changed profile curves ε / ε0 (T) |f SS (α1 = 0.04). The splitting of the maxima ε / ε0 (T) |f, obtained on the same samples after 7 months (April 2015) after the initial measurements (September 2014) is the result of degradation of solid solutions close to PbTiO3, probably due to begin the process of self-destruction ceramics.

Keywords: ferroelectric ceramics, lead titanate, alkaline-earth elements, thermodynamic prehistory, dielectric properties, the effects of degradation