Crystal structure, Raman spectra, and modified dielectric properties of pure‐phase ZnZrNb2O8 ceramics at low temperature

Abstract

AbstractLow‐temperature co‐fired ceramics technology (LTCC) exhibits enormous superiorities in packaging, integration, and interconnection. However, the complex compositions of low‐melting point sintering aids may react with ceramic matrix, which increases the difficulties of phase control and tape casting. In this work, the Li2CO3–B2O3–Bi2O3–SiO2 (LBBS) sintering aid was adopted to sinter ZnZrNb2O8 ceramics with single phase at low temperatures. The LBBS glass could be used to fabricate pure‐phase ZnZrNb2O8 ceramics at a low sintering temperature, promote the grain growth, and increase the densification of ZnZrNb2O8 ceramics. Furthermore, the unit cell volume, NbO6 octahedral distortion, Raman shift, and FWHM changed along with LBBS addition, thereby affecting the microwave dielectric properties. Remarkably, ZnZrNb2O8 ceramics doped with 0.75 wt.% LBBS at 950°C were chemically compatible with the silver electrode and exhibited excellent microwave dielectric characteristics: εr = 27.1, Q × f = 54 500 GHz, and τf = −48.7 ppm/°C, providing candidates for LTCC applications.