Enhanced Thermal Stability in Dielectric Properties of NaNbO3–Modified BaTiO3–BiMg1/2Ti1/2O3 Ceramics for X9R-MLCC Applications

Abstract

0.5BaTiO3–(0.5 − x)BiMg1/2Ti1/2O3−xNaNbO3 (x = 0.10–0.30) ceramics were processed via a conventional solid state sintering route. X-ray diffraction analysis and Raman spectroscopy showed the formation of a cubic perovskite structure. Microstructural analysis of the samples revealed densely packed grains. The addition of NaNbO3 resulted in the enhancement in dielectric properties as a function of temperature. Relative permittivity decreased from 850 to 564 (at room temperature) with an increase in x; however, the stability in dielectric properties was improved with an increase in NaNbO3 concentration. At x = 0.25, relative permittivity (εr) was ~630 ± 15% in a temperature range of −70–220 °C with low dielectric loss (tanδ) < 0.025 (−57 to 350 °C) and high recoverable energy density ~0.55 J/cm3 which meet the criterion for X9R MLCC applications.

0.90(0.88NaNbO3-0.12Bi(Ni0.5Zr0.5)O3)-0.10CaTiO3 Lead-Free Dielectric Ceramics with High Energy Storage Properties

“…The calculation formulas of P D , C D , and discharge energy density (W D ) are found in the Supporting Information. 24,42,43 In order to test the energy storage performance and discharge time of the 0.10 CT sample under actual conditions, we carried out the room temperature and variable temperature overdamped charge and discharge tests on the sample. The test results are shown in Figure 8a,d.…”

“…In the process, the I max of the sample decreased from 50.9 to 48.3 A and the C D decreased from 720.9 to 683.1A/cm 2 . The calculation formulas of P D , C D , and discharge energy density ( W D ) are found in the Supporting Information. ,, …”

Achieving outstanding temperature and frequency stability in NaNbO3-modified (Ba0.94Li0.02La0.04)(Mg0.04Ti0.96)O3 pulse energy storage ceramics

“…The modes at about 200-400 cm −1 are the variation of the Ti-O bond, and the modes at about 450-750 cm −1 are related to the variation of TO 6 octahedra. 20 Several points should be noticed; rst, the gradual disappearance of the v o , v r , and v 2 modes at x = 0.4-0.6 denotes that the O and R phases This journal is © The Royal Society of Chemistry 2023 gradually disappear and that the symmetry of the crystal improves, which is related to the disappeared {212} and {311} peaks. 21 The second point is that the v 1 mode at about 240 cm −1 moves to a lower wavenumber, which is caused by the loss of hybridization among the empty Ti 4+ /Nb 5+ d-orbitals and the oxygen p-orbitals.…”

Ferroelectric, Dielectric and Electromechanical Performance of Ba0.92Ca0.08Ti0.95Zr0.05O3 Ceramics with an Enhanced Curie Temperature

“…Batteries in modern electronic devices are vital components used for energy storage applications [ 18 ]. However, due to current limitations (lifecycles) [ 19 ], the piezoelectric energy harvesting technology has become of great interest as it offers high-power density levels, excellent fatigue performance, intrinsic ultrafast charge/discharge characteristics, and good mechanical and thermal stability [ 20 , 21 ]. Mechanical energy is the most versatile energy available in the environment.…”