Effects of (Mg1/3Sb2/3)4+ substitution on the structure and microwave dielectric properties of Ce2Zr3(MoO4)9 ceramics

Xu Zhou,Lintao Liu,Ningkang Zhang,Haitao Wu,Huazhang Sun,Wenhong Tao,Jiajia Sun

doi:10.1007/s40145-021-0472-3

Abstract

Ce2[Zr1−x(Mg1/3Sb2/3)x]3(MoO4)9 (0.02 ⩽ x ⩽ 0.10) ceramics were prepared by the traditional solid-state method. A single phase, belonging to the space group of Ru2a48erline 3 c, was detected by using X-ray diffraction at the sintering temperatures ranging from 700 to 850 °C. The microstructures of samples were examined by applying scanning electron microscopy (SEM). The crystal structure refinement of these samples was investigated in detail by performing the Rietveld refinement method. The intrinsic properties were calculated and explored via far-infrared reflectivity spectroscopy. The correlations between the chemical bond parameters and microwave dielectric properties were calculated and analyzed by Phillips-van Vechten-Levine (P-V-L) theory. Ce2[Zr0.94(Mg1/3Sb2/3)0.06]3(MoO4)9 ceramics with excellent dielectric properties were sintered at 725 °C for 6 h (εr = 10.37, Q×f = 71,748 GHz, and τf = −13.6 ppm/°C, εr is the dielectric constant, Q×f is the quality factor, and τf is the temperature coefficient of resonant frequency).

Highlights

It is well-known that dielectric materials have developed rapidly in the past decades
In order to meet the needs of calculating density and complex chemical bonds, the structure, lattice parameters, bond length, and unit cell volumes were further analyzed and obtained by Rietveld refinement [15]
Refinement plot of Ce2[Zr1−x(Mg1/3Sb2/3)x]3(MoO4)9 (0.02 ≤ x ≤ 0.10) ceramics are displayed in Fig. 2, in which the observed values are expressed by red points, the calculated values are expressed by the black line, and different values between the observed and the calculated data are expressed by the blue curve

Summary

Introduction

It is well-known that dielectric materials have developed rapidly in the past decades. Mo-based microwave dielectric ceramics have been studied in depth as shown in Table 1 [9,10,11,12,13]. [9] [9] [10] [11] [11] [12] [13] This work have been developed, but their properties are not optimistic. The performance (Q×f = 19,062 GHz) of Ce2Zr3(MoO4) ceramic was investigated [12]. In order to improve Q×f of Ce2Zr3(MoO4) ceramics, doping (Mg1/3Sb2/3)4+ at Zr-sites was reported in this work. The relationship between the dielectric properties and the structure of samples was explored scientifically by far infrared reflectivity spectrum and the Phillips–van Vechten–Levine (P–V–L) theory

Experimental

Results and discussion

Conclusions