Effects of Glass Addition on Microwave Dielectric Properties of Zn_0.95Mg_0.05TiO₃ + 0.25TiO₂ Ceramics

Abstract

The effects of Bi2O3 addition on the microwave dielectric properties and the microstructures of Zn0.95Mg0.05TiO3 + 0.25TiO2 with 1 wt% 3ZnO–B2O3 (ZnBO–ZMT') ceramics prepared by conventional solid-state routes have been investigated. In a preliminary study, it was shown that ZnBO–ZMT' ceramics can be sintered to a theoretical density higher than 95% at 900°C. In this study, the effects of Bi2O3 additions of up to 10 wt% on the sintering characteristics of the ZnBO–ZMT' ceramics was investigated at the sintering temperatures ranging from 860 to 960°C. Sintered ceramic samples were characterized by X-ray diffraction and scanning electron microscopy (SEM). It was found that as the content of Bi2O3 increases, the density of the sintered ceramics increases, and the sintering temperature can be lowered to 880°C by adding 5 wt% Bi2O3. The ZnBO–ZMT' ceramic with 5 wt% Bi2O3 addition sintered at 880°C exhibits the optimum dielectric properties: Q×f=4000 GHz, ε r=24.6, and τf=-14 ppm/°C. Unlike the ZnBO–ZMT' ceramic without Bi2O3 addition sintered at above 920°C, the ceramics with Bi2O3 additions show no Zn2TiO4 existence at 960°C sintering. It is therefore demonstrated that the addition of Bi2O3 can suppress the formation of Zn2TiO4 in ZnBO–ZMT' ceramics.

Microwave dielectric properties and microstructures of Nb2O5-Zn0.95Mg0.05TiO3+0.25TiO2 ceramics with Bi2O3 addition

“…Unlike the Nb-ZMT ceramics with Bi 2 O 3 addition, the ZMT ceramics with increasing amounts of Bi 2 O 3 show slightly variation of dielectric constant. In a previous study, 11 we have investigated the microwave dielectric properties of the ZMT ceramics with different amounts of Bi 2 O 3 addition. A comparison between the ceramics with and without Nb 2 O 5 dopant on the microstructure of the ceramics will be described briefly below.…”

“…In the previous study, 11 the microstructure and dielectric properties of the Bi 2 O 3 additive in Zn 0.95 Mg 0.05 TiO 3 + 0.25TiO 2 with 1 wt.% 3ZnO-B 2 O 3 ceramics have been investigated. It was found that 5 wt.% Bi 2 O 3 addition can significantly suppress spinel Zn 2 TiO 4 phase formation in the ZMT ceramics, but the microwave dielectric properties become worse due to low Q value (<600).…”

Microwave dielectric properties of 0.95MgTiO3–0.05CaTiO3 for application in dielectric resonator antenna

“…Only noble metals like palladium and platinum can be employed. Therefore, the use of such ceramics will increase manufacturing cost in terms of money and energy [6,7]. 0.95MgTiO 3 -0.05CaTiO 3 ceramics were mixed with low-softening-temperature glass materials to reduce the sintering temperature [8,9].…”

A Study of Low-Temperature Sintering of (Ba0.6Sr0.4)(Ti0.94Cu0.06)O3Ceramics with B2O3Addition

“…These materials are expensive, their electrical performance is poor, and the cost-effective fabrication of high-quality components is difficult. Several methods are commonly used for lowering the sintering temperature of dielectric ceramics, such as: the addition of glass; chemical pre-treatment and processing of ceramic powders; and the addition of small particles of starting materials [10][11][12]. Of these three methods, liquid-phase sintering with glass addition is generally known to be the most effective and the least expensive way of achieving high density sintered ceramics [13,14].…”