A new low-loss dielectric using CaTiO3-modified (Mg0.95Mn0.05)TiO3 ceramics for microwave applications

Dielectric Properties and Applications of Low‐Loss (1−x)(Mg0.95Ni0.05)2TiO4‐xSrTiO3 Ceramic System at Microwave Frequency

“…In general, the s f values of the composite ceramics can be estimated by the following mixing rule. 17 near-zero s f value can be obtained from mixing rule (4). The experimentally established near-zero s f composition (x = 0.07) matches the composition (x = 0.07) estimated using the mixing rule.…”

“…Research for new materials with such an optimum combination has been ongoing and reported in these few years. [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] Microwave dielectric properties of binary titanate ceramic Mg 2 TiO 4 has a spinel-type structure, belonging to the cubic space group Fd-3m (2 2 7). It exhibits a high dielectric constant e r $ 14, a high-quality factor Q9f $ 150,000 (GHz), and a temperature coefficient of resonant frequency s f $ À50 ppm/°C.…”

Dielectric properties of B2O3-doped 0.92(Mg0.95Co0.05)2TiO4–0.08(Ca0.8Sr0.2)TiO3 ceramics for microwave applications

“…The optimal microwave dielectric properties are achieved for specimen sintered at 1200 • C for 4 h. It possesses a dielectric constant (ε r ) of ∼18.07, a Q × f value of ∼95,000 GHz (at 9.5 GHz) and a temperature coefficient of resonant frequency ( f ) of ∼−4.7 ppm/ • C. In comparison with other similar ceramic system [26][27][28][29] (Table 3), the B 2 O 3 -doped 92MCT-8CST shows the highest Q × f at a comparably low sintering temperature.…”

Low-temperature sintered Zn2SiO4–CaTiO3 ceramics with near-zero temperature coefficient of resonant frequency

“…In this paper, attempts were made to achieve a near-zero f of Zn 2 SiO 4 , and to lower the sintering temperature below 950 • C. Since Zn 2 SiO 4 ceramics have negative f values and CaTiO 3 has a f of +859 ppm/ • C, ε r of 162 and Q × f value of 12,960 GHz [25,26], the (1 − x)Zn 2 SiO 4 − xCaTiO 3 composite ceramics should have adjustable f values. In (1 − x)Zn 2 SiO 4 − xCaTiO 3 composite ceramics (x = 0.05), the sintering temperature was lowered below 950 • C by adding Li 2 CO 3 -H 3 BO 3 as a sintering aid.…”