Dielectric properties of lanthanum substituted barium titanate microwave ceramics

Preparation and dielectric properties of thermo-vaporous BaTiO3 ceramics

“…Three pellets were shaped at different compacting pressures, while the temperature and duration of the sintering were taken from the literature. [19][20][21][22][23] The geometric density of the pellets was 84-86 % of the theoretical value of 6.01 g/cm 3 ( Table 1) and it naturally rose with the increase in the compaction pressure. In addition to the BaTiO 3, the XRD analysis showed the presence of an impurity phase in every pellet at 2q = 29° ( Figure 5), which is a complex barium aluminate titanate originating from the milling process.…”

Efficient Wideband Electromagnetic Scattering Computation for Frequency Dependent Lossy Dielectrics Using WCAWE

“…Dielectric ceramics are used extensively in microwave devices such as resonators and antennas. These materials are required to have high dielectric constants and low tangent losses in order to satisfy the demands of high electrical loads [8], [9]. Due to the precise nature of these devices, it is essential that the frequency dependent fluctuation of the dielectric properties is accounted for in a frequency sweep analysis.…”

“…Due to the precise nature of these devices, it is essential that the frequency dependent fluctuation of the dielectric properties is accounted for in a frequency sweep analysis. Recently, several new microwave dielectric ceramics, with excellent dielectric properties, were reported in [9] and will be used as the basis for this study. The contribution of this variation in the dielectric properties of the ceramic Ba La Ti O , in the GHz frequency range, will be investigated for various compositions of the four components [9] (between and ).…”

“…Recently, several new microwave dielectric ceramics, with excellent dielectric properties, were reported in [9] and will be used as the basis for this study. The contribution of this variation in the dielectric properties of the ceramic Ba La Ti O , in the GHz frequency range, will be investigated for various compositions of the four components [9] (between and ). Frequency-dependent dielectric variations occur in all materials and typically consist of a decrease in the real and imaginary part of the permittivity as the frequency increases.…”

“…Work in [8], [9], [12]- [14] has tabulated the electromagnetic properties of various materials. In particular the complex dielectric constant and their variation against frequency were noted from empirical measurements.…”