Microwave Electrodynamic Study on Antiferroelectric Materials in a Wide Temperature Range

Abstract

The electrodynamic properties of lead zirconate titanate ceramic solid solutions, exhibiting ferro-antiferroelectric phase transition, are investigated at microwave frequencies in a wide temperature range. Significant changes in the electrodynamic response are found, presumably associated with structural rearrangements accompanying the sequence of phase transitions between para-, ferro-, and antiferroelectric states. The phenomena observed in the experiments are considered under conditions of changing temperature and concentrations of the components; several independent measurement techniques were used for their unambiguous identification.

Microwave Absorption Properties of Ceramics Based on BiFeO3 Modified with Ho

“…d i(av) and d wg(av) were calculated as the arithmetic mean of the forward and reverse loss coefficients, which is due to their similarity for all the experiments performed (in our case the system is a symmetrical four-port network). Previously, this method was used by a team of authors to evaluate the microwave absorption of ferroelectric ceramic materials [18]. The absorption parameters of materials can therefore be considered either as losses of the whole system or as differential losses due to the presence of an experimental sample in the measurement cell.…”