Synthesis and Dielectric Properties of a Temperature Stable Ceramic: Ba₄La_3.73Sm_4.66Bi_0.93Ti₁₈O₅₄

Abstract

A temperature stable high dielectric constant Ba₄La_3.73Sm_4.66Bi_0.93Ti₁₈O₅₄ ceramic was synthesized by conventional solid state route. The structural and micro-structural properties were investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The compound crystallizes in the orthorhombic system with unit cell parameters as a = 12.56Å, b = 22.25Å, c = 3.83Å and v = 1070.33ų. The microwave dielectric properties were measured in the frequency range 0.3 to 3.0 GHz using a network analyzer and it shows a high dielectric constant of 86.1 and low loss tangent of 4.3 × 10^–3 at 3.0 GHz along with a very low temperature coefficient of resonant frequency of 4.3 ppm/°C. It could be a promising candidate to be used as dielectric resonator in microwave communication.

Keywords:

• Ceramics
• dielectrics
• dielectric constant
• loss tangent
• temperature coefficient of resonant frequency

Acknowledgments

Communicated by Dr. Deborah J. Taylor