Effects of MnO addition on the stable dielectric properties of BaTiO3- (Bi0.5Na0.5)TiO3-Ta2O5 ceramics

Effects of co-precipitation method on microwave dielectric properties of 0.7CaTiO3-0.3SmAlO3ceramics

“…The CaTiO 3 precursor (refers to precipitates: CaC 2 O 4 , Ti(OH) 4 ) and SmAlO 3 precursor (refers to precipitates: Sm(OH) 3 , Al(OH) 3 ) were both prepared by co-precipitation method. CaCO 3 (99.8%), Sm 2 O 3 (99.0%),…”

“…There followed the preparation of CaTiO 3 precursor, CaCO 3 was dissolved in diluted HNO 3 as solution 1. At the same time, the H 2 C 2 O 4 ·2H 2 O and Ti(C 4 H 9 O) 4 were mixed according to the molar ratio of 2:1 in ethanol solution as solution 2. Then the two mentioned solutions were intermixed and NH 3 [aq] was slowly dripped into the new solution until the value of pH reached 5 in order to restrain the hydrolysis of Ca 2+ to promote the combination of Ca 2+ and C 2 O 4 2+ [18].…”

“…Microwave dielectric materials play a significant role in modern society with a wide range of applications from terrestrial and satellite communication including software radio, GPS, and DBS TV to environmental monitoring via satellites [1,2]. Generally, the microwave dielectric materials applied to the base stations of telecommunications are demanded to possess high quality factor (Q×f ) for high power, high dielectric constants (ε r ) for miniaturization and low temperature coefficients of resonant frequency (τ f ) for frequency stability [3][4][5]. CaTiO 3 is known for its high ε r (=160) and moderate Q×f (=3500 GHz) but its high positive τ f (= +800 ppm°C) makes it hard to be extended in practical applications [6,7].…”

High permittivity and excellent high‐temperature energy storage properties of X9R BaTiO3–(Bi0.5Na0.5)TiO3 ceramics

“…At present, the highest dielectric constant of BaTiO 3 ‐based ceramic is 2458 at 20°C, and the highest dielectric constant of K 0.5 Na 0.5 NbO 3 ‐based ceramic is 2310 . The dielectric constants of most BaTiO 3 ‐based ceramics are lower than 2000 . It is necessary to improve the dielectric constant of BaTiO 3 ‐based ceramic up to 2000 and dielectric loss lower than 2% at temperature of 25°C.…”