Relationship Between Bond Ionicity, Lattice Energy, and Microwave Dielectric Properties of <scp> <scp>Zn</scp> </scp> ( <scp> <scp>Ta</scp> </scp> _{1− <i>x</i>} <scp> <scp>Nb</scp> </scp> _<i>x</i> ) ₂ <scp> <scp>O</scp> </scp> ₆ Ceramics

Abstract

The crystalline structure refinement, chemical bond ionicity, and lattice energy were carried out for Zn ( Ta 1− x Nb x ) 2 O 6 ceramics with tri‐α‐ PbO 2 structure to investigate the correlations between the crystalline structure, phase stability, bond ionicity, and microwave dielectric properties. The chemical bond ionicity and lattice energy of the Zn Ta 2 O 6 system were calculated and evaluated using a semiempirical method based on the dielectric description theory proposed by Phillips, Van Vechten, and Levine ( P – V – L theory). The crystalline structure stability varied with the content of Nb 5+ ion resulted in the lattice energy decrease. The increase of Ta / Nb – O bond ionicity was observed in the crystalline structure, which should be main contribution to electric polarization. The dielectric properties of the Zn ( Ta 1− x Nb x ) 2 O 6 ceramics were strongly dependent on the chemical bond ionicity of Ta / Nb – O bond with tri‐α‐ PbO 2 structure.