The powder samples of (Na(0.5)Bin(0.5))(0.705)Ba0.045Sr0.25TiO3-xLa(2)O(3) (NBBSLT) have been prepared successfully by a wet solid-phase method. The effects of La doping on the morphology, ferroelectric and dielectric properties of NBBSLT ceramics were studied. XRD results show that the composite has perovskite structure. The dense phase morphology of NBBSLT was observed by SEM. Dielectric measurements show that depolarization temperature and Curie temperature move toward low temperature. With the increase of La content, the ferroelectric hysteresis loops at room temperature become thinner at first and then wider. The NBBSLT ceramics have excellent energy storage properties when the La content is 0.04.

The powder samples of (Na0.5Bi0.5)(0.705)Ba0.045Sr0.25TiO3-xNb(2)O(5) (NBBSNT) were synthesized by a wet solid-phase method. The effects of Nb-doping on morphology, ferroelectric and dielectric properties of samples were investigated. Typical surface morphologies by scanning electron microscopy for the NBTBZN ceramics showed grain size decreasing. Dielectric measurements revealed that the depolarization temperature and Curie temperature shifted to lower temperature. With the increase of Nb content, the ferroelectric hysteresis loops became much slimmer, coupled with the reduction in remnant polarization and coercive field. Energy storage density of 0.855 J/cm(3) and the energy storage efficiency of 74.26% were obtained for NBBSNT with x = 0.09.

With the miniaturization of electronic products, the portability and the critical need of clean energy for environment have led to the development of lead-free electroceramics. In this work, lead-free dielectric ceramics of 0.94Na[Formula: see text]Bi[Formula: see text]TiO3–0.06BaTiO3 (NBT–0.06BT) are synthesized by wet solid-phase method. The effects of calcination temperature on phase structure, morphology, densification behavior and dielectric properties are investigated. The XRD results indicate that all samples demonstrate typical diffraction peaks of perovskite structure. The SEM and dielectric analytical results show that high-performance dielectric property of NBT–0.06BT ceramic with dense microstructure and appropriate grain size can be achieved when the calcination temperature is appropriate.

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.

New dielectric composite ceramics Na 0.5 Bi 0.5 TiO 3 –Ba (1– x ) Sr x Ti 0.995 Zr 0.005 O 3 (NBT–BSTZ) ( x = 0.05, 0.1, 0.2, 0.3) have been fabricated by the wet solid-state route. The effect of Sr content on phase structure and electrical properties has been studied in detail. The X-ray diffraction analysis illustrates that the composites consist of tetragonal perovskite. With increasing Sr content, the ceramic capacitors display larger dielectric constant, better temperature stability, and lower dielectric loss in dielectric behavior. The ceramics with composition x = 0.3 possess a large dielectric constant (ε r ) of 2522. The temperature coefficient of capacitance of NBT–BSTZ varies from –39% to 36% in the temperature range between 0 and 200°C. The dielectric loss of capacitance is below 0.07 while the Sr content is 0.3 in the whole range of measured temperatures. The results indicate that Sr-doping is an effective method to modulate the temperature stability and dielectric loss of the NBT– BSTZ dielectric ceramics.

The powder samples of [(Na0.5Bi0.5)0.94Ba0.06]1−xSrxTiO3 (NBBST) have been prepared successfully by a wet solid-phase method. The effects of Sr-doping on morphology, ferroelectric and dielectric properties of NBBST ceramic samples have been investigated in detail. The XRD results show that the compounds possess perovskite phase structure. The dense phase morphology of NBBST is observed by scanning electron microscopy. Dielectric measurements show that the depolarization temperature and Curie temperature shift to low temperature. The ferroelectric hysteresis loops at room temperature become much slimmer with the increase of Sr content. When Sr-doping content is 0.30, the Ps of NBBSNT ceramic sample decreases distinctly. the Sr-25 ceramic samples have superior energy storage performance in the system, Which energy storage density is 0.318 J/cm3 at 70 kV/cm.

The ceramics with the composition of [Formula: see text]–[Formula: see text] (NBT–BMST) in which [Formula: see text] = 0.2, 0.3, 0.4 and 0.5 were prepared successfully by the solid-state reaction method. The effects of NBT-doping on phase structure, morphology, temperature stability and dielectric properties had been investigated in detail. The XRD results show that the composites are composed of tetragonal perovskite. The phase structure of NBT–BMST is observed by scanning electron microscopy. The dielectric constant of [Formula: see text]–[Formula: see text] ceramic is [Formula: see text][Formula: see text]4100, the temperature coefficients of capacitance are −15%, 15% and 22% at −55[Formula: see text]C, 60[Formula: see text]C and 200[Formula: see text]C, respectively. And the dielectric loss is less than 0.13, which is obviously superior to other compositions. The results of this work showed that the component of [Formula: see text]–[Formula: see text] is a promising candidate to high-temperature stable materials.

A wet solid-state method was used in this work to produce [Formula: see text]–[Formula: see text] materials. By using core-shell structure nanocubic [Formula: see text] (BMST) decorated [Formula: see text] (BBT) assemblies, a composite capacitor with improved dielectric constant and enhanced breakdown strength was successfully fabricated in contrast with the composite ferroelectric [Formula: see text]–[Formula: see text] (BBT–BST) ceramic. With increasing Mg content, the ceramic capacitors display a stronger performance in its dielectric behavior. The best dielectric properties were obtained in the composition [Formula: see text] = 0.007 with the dielectric constant above 65,000. The dielectric strength of the ceramics was measured by a withstanding voltage tester. The best dielectric strength was achieved in the composition [Formula: see text] = 0.007 with [Formula: see text] = 5.455 kV/mm.