Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10623947 | Ceramics International | 2016 | 7 Pages |
Abstract
Single phase AZrNb2O8 (A=Zn,Co,Mg,Mn) ceramics with monoclinic wolframite structure were prepared and characterized by crystalline structure refinement for the investigation on the correlations between crystal structure and microwave dielectric properties. A semiempirical method based on the complex bond theory was used to calculate the bond ionicity, lattice energy, and coefficient of thermal expansion of AZrNb2O8 ceramics. The crystal structure changed with the variation of A site ions and affected the Nb-O octahedral correspondingly. Due to the variation of crystal structure, the observed bond ionicity was helpful to understand the electric polarization. The variation of the QÂ·Æ and ÏÆ values could be attributed to the lattice energy and coefficient of thermal expansion respectively. The microwave properties of AZrNb2O8 ceramics were strongly dependent on the chemical bond ionicity, lattice energy and coefficient of thermal expansion.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Haitao Wu, Eung Soo Kim,