Enhanced temperature-stability in tunable dielectric properties of (1-x) (K0.49Na0.49Li0.02)(Nb0.8Ta0.2)O3-xCaZrO3 ceramics

(1-x)(K0.49Na0.49Li0.02)(Nb0.8Ta0.2)O3-xCaZrO3 (x=0, 0.025, 0.05 and 0.075, abbreviated as KNLNT-1000xCZ) ceramics were prepared by a solid state method. The correlations between phase constitution, domain configuration and tunable dielectric properties are investigated. Due to the combined effects of multi-phase coexisting and nanoscaled domain, KNLNT-50CZ has a high dielectric tunability (60.0%) at the room temperature and 1 kHz under the electric field of 30 kV/cm. More importantly, the high tunability can be maintained stable in the temperature range of 25-150 °C with a smaller variation of ± 10%, which is superior to most of other tunable dielectric materials. The excellent temperature stability in tunable dielectric properties is ascribed to the diffused phase transition and coexistence of multi-phases in this temperature range. Therefore, our work has provided a new promising candidate for temperature-independent tunable dielectric materials.