SYNTHESIS OF INDIUM LEAD TANTALATE PB2INTAO6 AND THE SYSTEM (1 - Х)PB2YBNBO6 + ХPB2FENBO6 (Х = 0.1) USING MECHANOCHEMICAL ACTIVATION AND RADIATION-THERMAL SINTERING

We consider the influence of mechanical activation and radiation-thermal sintering on the synthesis of indium lead tantalate, used in optical electronics and capacitor-based technologies, and the system (1 - х)Pb2YbNbO6 + хPb2FeNbO6 (х = 0.1), the solid solutions of which exhibit high di-, piezo- and magnetoelectric characteristics. The conditions of perovskite and pyrochlore phase formation during both mechanochemical synthesis and subsequent sintering within a wide temperature range with different electron beam exposure times are investigated. To reduce the electrical conductivity of the ceramic, lithium carbonate, which is also a stabiliser of perovskite structure, was introduced into the batch. It has been shown that the characteristics of the final product are determined by the chosen conditions of batch preparation for sintering. The methods of such preparation differing in the order of mechanical activation and the conditions for introducing the components are compared. The optimal conditions have been established that make it possible to obtain piezoceramics with the largest amount of the perovskite phase and maximum density. The prospects of using radiation-thermal sintering on several piezoceramic systems were assessed. It has been established that a number of intermediate phases are formed during radiation-thermal synthesis, though these phases never appeared during conventional sintering. The results obtained in the work suggest that sintering of some lead-containing samples at an accelerator under the action of the electron beam is a promising method to synthesise a monophase complex oxide with perovskite structure. The developed method is of practical interest for obtaining piezoceramics.