The powder samples of Na0.5Bi0.5TiO3-Ba0.7-xLaxSr0.3Sn0.1Ti0.9-0.25xO3 (NBT-BLSST) have been prepared successfully by a wet solid-phase method. The effects of La-doping on morphology, temperature stability and dielectric properties of NBT-BLSST ceramic samples have been investigated in detail. The XRD results show that the composites possess tetragonal perovskite phase structure. The dense phase morphology of NBT-BLSST is observed by scanning electron microscopy. The dielectric constant of ceramic samples can reach 4618 while the La doping is 0.8 mol%. The dielectric loss of capacitance is below 0.097. The temperature coefficient of capacitance varies from -15.02% to 16.13% in the temperature range between -55 degrees C and 200 degrees C. The temperature characteristic of capacitance is very close to EIA X9R specifications. (C) 2018 Elsevier B.V. All rights reserved.

The synthesis of (1-x)Na0.5Bi0.5TiO3-xBa(0.66)Mg(0.04)Sr(0.3)Sn(0.1)Ti(0.9)O(3) by the wet solid-phase method was successfully investigated. The microstructure, dielectric properties, and temperature stability of the obtained ceramics were investigated in detail. The size of the grains was determined by scanning electron microscopy. It was determined that the addition of Na0.5Bi0.5TiO3 could enhance the dielectric constant. When the NBT amount is 0.4mol%, the dielectric loss of capacitance is below 0.11 and the dielectric constant of the composites is about 1720. The temperature coefficient of capacity varied from -12.24% to 4.79% at the temperature range between -55 degrees C and 200 degrees C. The temperature-capacitance characteristics meet EIA X9R specifications.

(Pb,La,Sr)(Zr,Sn,Ti,Nb)O3 + xmol% MnO2 (PLSZSTNM) ceramics with broad working temperature are fabricated by a wet-chemistry method. The effects of Mn-doping on dielectric breakdown strength, morphology, temperature-stability and dielectric properties have been investigated in detail. The ferroelectric behavior of PLSZSTNM ceramics is strongly affected by Mn doping. With increasing Mn-doping, dielectric constant of ceramics increase, followed by a drop. Furthermore, as the Mn amount is 0.2 mol%, the dielectric loss of capacitance is below 0.01 and the dielectric constant of the composites is about 577.5. The temperature coefficient of capacity varied from − 14.9 to 8.3% at the temperature range between − 55 and 200 °C. The temperature–capacitance characteristics of PLSZSTNM ceramics meet EIA X9R specifications, which lays a foundation for high temperature-stable materials.