New Preparation Method of Low‐Temperature‐Sinterable Perovskite 0.9Pb(Mg _1/3 Nb _2/3 )O ₃ ‐0.1PbTiO ₃ Powder and Its Dielectric Properties

Abstract

A relaxor ferroelectric material, 0.9Pb(Mg 1/3 Nb 2/3 )O 3 ‐0.1PbTiO 3 (0.9PMN‐0.1PT) with a pyrochlore‐free phase, was prepared by using one‐step calcination in the present study. The 0.9PMN‐0.1PT powder with the pure perovskite phase was prepared successfully from a mixture of the PMN precursor and the crystalline PT by heating for 2 h at temperatures greaterthan equal to750°C. The PMN precursor was synthesized by adding an aqueous Mg(NO 3 ) 2 solution, rather than MgO, to the alcoholic slurry of PbO and Nb 2 O 5 . The 0.9PMN‐0.1PT powder sintered to >96% relative density via heat treatment for 2 h at temperatures of 900°‐1200°C. The highest room‐temperature dielectric constant (epsilon rt ) was 24700 at 1 kHz for the samples that were sintered at 1100°C; however, the samples that were sintered at 900°C still had epsilon rt values of 22600 at 1 kHz.