Crystal structure, Raman spectra, and modified dielectric properties of pure‐phase ZnZrNb <sub>2</sub> O <sub>8</sub> ceramics at low temperature
Gang Wang, Zhipeng Chen, Hui Yan, Tao Xuan, Mengyan Wu, Xue Li Zhu, Tong Ding, Ding Li, Xingang Ren, Xianliang Wu, Huaiwu Zhang
Abstract
Abstract Low‐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 Li 2 CO 3 –B 2 O 3 –Bi 2 O 3 –SiO 2 (LBBS) sintering aid was adopted to sinter ZnZrNb 2 O 8 ceramics with single phase at low temperatures. The LBBS glass could be used to fabricate pure‐phase ZnZrNb 2 O 8 ceramics at a low sintering temperature, promote the grain growth, and increase the densification of ZnZrNb 2 O 8 ceramics. Furthermore, the unit cell volume, NbO 6 octahedral distortion, Raman shift, and FWHM changed along with LBBS addition, thereby affecting the microwave dielectric properties. Remarkably, ZnZrNb 2 O 8 ceramics doped with 0.75 wt.% LBBS at 950°C were chemically compatible with the silver electrode and exhibited excellent microwave dielectric characteristics: ε r = 27.1, Q × f = 54 500 GHz, and τ f = −48.7 ppm/°C, providing candidates for LTCC applications.