Enhanced thermal stability in dielectric properties of NaNbO3-modified BaTiO3-BiMg1/2Ti1/2O3 ceramics for X9R-MLCC applications

RAZ MUHAMMAD; ASIF ALI; JAVIER CAMARGO; MIRIAM S. CASTRO; WEN LEI; KAIXIN SONG; DAWEI WANG

Crystals

Multidisciplinary Digital Publishing Institute

Lugar: Basilea; Año: 2022

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 cubic perovskite structure. Microstructural analysis of the samples revealed dense 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 increase in x; however, the stability in dielectric properties was improved with increase in NaNbO3 concentration. At x = 0.30, relative permittivity (er) was ~ 630±15% in a temperature range of -70 − 220 ℃ with low dielectric loss (tand) < 0.025 (-57 to 350 ℃) and high recoverable energy density ~ 0.55 J/cm3 which meet the criterion for X9R MLCC applications.