Abstract
Ba1−xLaxZr0.1Ti0.9O3 ceramics have been prepared by the mixed-oxide route, and their structure and dielectric properties have been investigated. Results showed that La3+ ions entered the unit cell maintaining the perovskite structure. The evolution of dielectric behavior from a sharp dielectric peak with pinched phase transitions (x=0.00) to a broad dielectric peak with frequency dependence (0.01⩽x⩽0.02) and successively to a ferroelectric relaxor (x=0.05) was observed with increasing La concentration. Furthermore, remnant polarization and strain decreased due to phase transformation from ferroelectric tetragonal to paraelectric pseudocubic at room temperature.
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