Dielectric Properties and Quantitative Phase Analysis of the Sn-Doped ZnO-TiO₂-Nb₂O₅ Ceramics

Abstract

The microwave dielectric properties and crystal structure of the ZnO-xSnO ₂ -(2–x)TiO ₂ -Nb ₂ O ₅ ceramics were investigated. There were two phases existing in the ceramics: ixiolite phase ZnTiNb ₂ O ₈ and rutile phase Zn _0.15 Nb _0.30 Ti _0.55 O ₂ . The mass percentage of phase ZnTiNb ₂ O ₈ increased with increasing of SnO ₂ content from 0.02 to 0.08, and when x ≥ 0.08 the mass percentage of phase ZnTiNb ₂ O ₈ decreased. For the dielectric constant and dielectric loss of the ceramics, these values ranged from 49 to 63 and from 2.4× 10^{− 4} to 0.30× 10^{− 4}, respectively. The temperature coefficient of the ceramics decreased from −132 × 10^{− 6}/°C to −12 × 10^{− 6}/°C.

Keywords:

• Crystal Structure Refinement
• microwave dielectric properties
• ZnTiNb₂O₈
• Zn_0.15Nb_0.30Ti_0.55O₂

Acknowledgments

This work was supported by Program for New Century Excellent Talents in University (NCET) and 863 program (2007AA03Z423) and China Postdoctoral Science Foundation.