Microwave Dielectric Properties and Low‐Temperature Sintering of Cerium Oxide for LTCC Applications

Abstract

were added to CeO 2 powder. The crystal structure of the ceramic-glass composites was studied by X-ray diffraction, microstructure by scanning electron microscopy, and phase composition using the energy-dispersive X-ray analysis technique. The microwave dielectric properties such as relative permittivity (e r ), quality factor (Q u xf), and coefficient of temperature variation of resonant frequency (s f ) of the ceramics have been measured in the frequency range 4-6 GHz. Addition of B 2 O 3 and Bi 2 O 3 -ZnO-B 2 O 3 -SiO 2 lowered the sintering temperature of ceria to about 9001C. The 20 wt% B 2 O 3 and 10 wt% Bi 2 O 3 -ZnO-B 2 O 3 -SiO 2 -added CeO 2 and sintered at 9001 and 9501C showed: Q u xf 5 24 200 and 12 000 GHz, e r 5 13.2 and 22.4, and s f 5 À46 and -57.2 ppm/1C, respectively.

Microwave Dielectric Properties and Thermally Stimulated Depolarization Currents of MgF2‐Doped Diopside Ceramics

“…It can be seen from Fig. 3,5 However, in this case, it seems reasonable to conclude that proper MgF 2 addition cannot only be effective to lower the sintering temperature but also to modify the microwave dielectric properties of host materials. 8,12 As for glass-added ceramics, it is very common that secondary phases have deleterious effects on microwave dielectric properties.…”

“…2(b) for the 3 wt% MgF 2 -doped CMZS sintered at 1025°C, and the poor densification is due to the low sintering temperature. 3 On the other hand, it seems reasonable to assume that F could enter the network of silicon-oxygen tetrahedron motivated by the chemical reactions. 2(c).…”

Low temperature sintering and characteristics of K2O–B2O3–SiO2–Al2O3 glass/ceramic composites for LTCC applications

“…LTCC substrate materials becomes the indispensible new material in computer, T/R module and optical communication field [4]. It contains glass-ceramic and glass/ceramic, the latter of which are widely used as the former one has requirement for complete densification and certain degree of crystallization.…”

Low-temperature sintering and microwave dielectric properties of Mg3B2O6-LMZBS composites

“…Addition of low melting glass or oxides is an effective way to lower the sintering temperature. Many kinds of glass such as ZnO-B 2 O 3 -SiO 2 , Li 2 O-B 2 O 3 -SiO 2 , Li 2 O-MgO-ZnO-B 2 O 3 -SiO 2 and low melting point B 2 O 3 are widely used for low-temperature sintering, and a number of glass-ceramic composites have been developed for LTCC application [7][8][9][10][11][12].…”