Analysis of Ca2+ Substitution on the Phase, Microstructural and Dielectric Properties of Ba(1−x)Ca(x)(Zn1/3Nb2/3)O3 Ceramics

Abstract

ABSTRACT Ceramic compositions of Ba(1−x)Ca(x)(Zn1/3Nb2/3)O3 (BCZN) (0 ≤ x ≤ 0.2) were synthesized using a solid state route sintered at 1250°C. The effect of Ca2+ dopants on the phase, microstructure, and dielectric properties was investigated. X‐ray diffraction (XRD) reveals a peak shift to a low 2θ value having a cubic structure with space group Pm3m for all the composites (0 ≤ x ≤ 0.2). SEM images show a dense microstructure with variations in grain size from 1.2 to 2.9 μm when doped with Ca2+ contents. The dielectric constant (εr) decreased to 73 with increasing Ca2+ concentration. Similarly, a high quality factor (Q × f) of 37.1 × 103 MHz for x = 0.15 and low tangent loss (tanδ) 12–1.2 for 0 ≤ x ≤ 0.2 were observed.

Keywords

• ceramics
• dielectric
• DR