Microwave dielectric properties and mixture behavior of (Mg0.95Co0.05)TiO3–Ca0.6La0.8/3TiO3 ceramic system

Study of (1−x)(Mg0.6Zn0.4)0.95Co0.05TiO3–xCa0.61Nd0.26TiO3 microwave dielectrics

“…Huang et al reported that a new series of microwave dielectric materials with positive temperature coefficient of resonant frequency were added to (Mg, Co, Zn)TiO 3 ceramic system. The experiment results showed that these ceramic systems had excellent microwave dielectric properties [9][10][11][12].…”

Characterization and dielectric behavior of V2O5-doped 0.9Mg0.95Co0.05TiO3–0.1Ca0.6La0.8/3TiO3 ceramic system at microwave frequency

“…The advantage of using dielectric resonator is that it makes the size reduction of microwave components possible. Requirements for these dielectric devices must be combined with a high dielectric constant (ε r > 15) for possible size miniaturization (size of a dielectric resonator is .1/ √ ε r ), a low dielectric loss (Q > 5000, where Q = 1/tan ı) for high frequency selectivity and low signal attenuation, and a near-zero temperature coefficient of resonant frequency ( f ) for temperature stable circuits [1][2][3][4][5]. These three parameters are correlated to the size, frequency selectivity and temperature stability of the system, respectively.…”

“…In our previous study, Ca 0.6 La 0.8/3 TiO 3 was added to Mg 0.95 Co 0.05 TiO 3 as a ceramic system of (1 − x)Mg 0.95 Co 0.05 TiO 3 -xCa 0.6 La 0.8/3 TiO 3 (hereafter referred to as MCT-CLT), which demonstrated an effective compensation in its temperature coefficient ( f ) [2]. As x = 0.1, the 0.9Mg 0.95 Co 0.05 TiO 3 -0.1Ca 0.6 La 0.8/3 TiO 3 (hereafter referred to as 91MCT-CLT) ceramic sintered at 1350 • C/4 h exhibited excellent microwave dielectric properties: a dielectric constant (ε r ) of 21.8, a Q × f value of 131,000 (GHz) and a temperature coefficient ( f ) of −15.5 ppm/ • C. In this study, V 2 O 5 was added to the (1 − x)Mg 0.95 Co 0.05 TiO 3 -xCa 0.6 La 0.8/3 TiO 3 ceramics system as a sintered aid to lower its sintering temperature and to improve its microwave dielectric properties.…”

Characterization and dielectric behavior of a new dielectric ceramics MgTiO3–Ca0.8Sr0.2TiO3 at microwave frequencies

“…Basically, a dielectric resonator is a ceramic compact with high dielectric constant (ε r > 25), low dielectric loss or high quality factor (Q > 2000) and good temperature stability (near-zero temperature coefficient of resonant frequency, f ) at microwave frequencies [2][3][4][5][6][7][8][9][10][11][12][13].…”

“…In the microwave frequency range, MgTiO 3 ceramics show good dielectric properties: dielectric constant (ε r ) ∼17, quality factor (Q × f value) ∼160,000 (GHz), and temperature coefficients of resonant frequency ( f ) approximately −51 ppm/ • C [20]. Instead of CaTiO, Ca 0.8 Sr 0.2 TiO 3 ceramics having much higher dielectric properties of ε r ∼181, Q × f value ∼8300 (GHz) and a large positive f value ∼991 ppm/ • C [21] than that of CaTiO 3 (Table 1) was chosen as a f compensator for MgTiO 3 .…”