Crystal structure and microwave dielectric characteristics of Co-substituted Zn_1−xCo_xZrNb₂O₈ (0 ≤ x ≤ 0.1) ceramics

Abstract

Wolframite structure Zn1−xCoxZrNb2O8 (x = 0, 0.02, 0.04, 0.06, 0.08, 0.10) ceramics were prepared by the conventional solid state method.

Usage of P–V–L bond theory in studying the structural/property regulation of microwave dielectric ceramics: a review

“…37. 217 A and Zr atoms are in the 2f Wyckoff position while Nb is in a 2e site. All the cations are six-fold coordinated, forming structural basic units of [MO 6 ] octahedra (M = A, Zr, Nb).…”

“…199 with permission from the PCCP Owner Societies; Reproduced from ref. 217 with permission from the Royal Society of Chemistry. The authors acknowledge financial supports from the National Natural Science Foundation of China (Grant.…”

The latest process and challenges of microwave dielectric ceramics based on pseudo phase diagrams

“…The microwave dielectric properties of wolframite-type AZrB 2 O 8 (A = Mn, Zn, Mg, Co, Ni; B = Nb, Ta) and the structure-relationship were determined via combining the far-infrared and terahertz spectroscopy with P-V-L theory [87][88][89][90][91]. Partial replace of A-site (such as Mg 0.5 Zn 0.5 ZrNb 2 O 8 [92], Zn 1-x Co x ZrNb 2 O 8 [93][94][95]), Zr-site substitution of Zn(Ti 1-x Zr x )Ta 2 O 8 [96], ZnZr 1-x Sn x Nb 2 O 8 [97,98], doped Nb-site of MgZr(Nb 1-x Sb x ) 2 O 8 [99,100], ZnZrNbTaO 8 [101], MgZrNb 2-x (Sn 1/2 W 1/2 ) x O 8 [102], and nonstoichiometric MgZrNb 2+x O 8+2.5x [103] provided evidence that relative density, packing fraction, bond valence, and chemical bond characteristics majored the variation of microwave dielectric properties. To adjust the negative τ f values, the study about the relationship of TiO 2 on MgZrNb 2 O 8 [104] and ZnZrNb 2 O 8 [105] presented that co-exited ceramics would reach near zero τ f values.…”