The low-temperature sintering and microwave dielectric properties of (Zn_0.7Mg_0.3)TiO₃ceramics with H₃BO₃

Abstract

The effects of the addition of H3BO3 on the microstructure, phase formation, and microwave dielectric properties of (Zn0.7Mg0.3)TiO3 ceramics sintered at temperatures ranging from 890 °C to 950 °C are investigated. H3BO3 as a sintering agent can effectively lower the sintering temperature of ZMT ceramics below 950 °C due to the liquid-phase effect. The microwave dielectric properties are found to strongly correlate with the amount of H3BO3. With the increase in H3BO3 content, the dielectric constant (εr) monotonically increases, but the quality factor (Q × f) reaches a maximum at 1 wt% H3BO3, and the apparent density of ZMT ceramics with H3BO3 ≥ 1 wt% gradually decreases. At 950 °C, the ZMT ceramics with 1% H3BO3 exhibit excellent microwave dielectric properties: εr = 19.8, and Q × f = 43800 GHz (8.94 GHz).

Characterization of the dielectric properties of water and methanol in the D-band using a quasi-optical spectroscopy

“…In design of mm wave components, the permittivity is a key parameter that determines the RF performance. For instance, the real part of the permittivity determines the central frequency and the imaginary part (also the loss tangent) determines the insertion loss and gain of a mm wave device 4,5 . In addition, the permittivity is also a basic parameter in the study of electromagnetic wave with matters 6 .…”

Dual-band LTCC antenna based on 0.95Zn 2 SiO 4 -0.05CaTiO 3 ceramics for GPS/UMTS applications

“…In order to overcome the limit of conventional planar antenna structure, the utilization of multilayer low temperature co-fired ceramic (LTCC) technology gives the possibility of building highly integrated circuits in a single substrate. [1,2] It enables a significant number of circuit components to be integrated within a module by embedding them in a multilayer substrate. Therefore, LTCC technology is able to produce compact and multiband antennas.…”

Effects of BaCu(B2O5) addition on sintering temperature and microwave dielectric properties of Ba5Nb4O15–BaWO4ceramics

“…[1,2] However, most of the sintering temperatures of the ceramic materials are relatively high, which is the reason why the materials cannot be co-fired with Ag or Cu nor applied to the low-temperature co-fired ceramic (LTCC) technology. [3][4][5] As a result, the lowering of the sintering temperatures of dielectric ceramics is critical in order to apply LTCC technology to the fabrication of dielectric devices, such as resonators and filters. [6][7][8][9][10] Ba 5 Nb 4 O 15 , a hexagonal perovskite compound, is one of the most promising dielectric ceramics due to its good microwave dielectric properties of ε r = 39.2, Q × f = 26337 GHz, and τ f = 79.1 ppm/ • C. [11][12][13] However, the sintering temperature and the temperature coefficient of the resonant frequency of Ba 5 Nb 4 O 15 ceramic are too high to be used in the LTCC for commercial production.…”