Optimizing conditions of fabrication and the properties of BaNb2O6-SrNb2O6 binary ceramics

Abstract

Conditions for fabricating (Ba 0.5 Sr 0.5 )Nb 2 O 6 ceramics are optimized. It is shown that materials synthesized at T = 1250°C and sintered at T = 1375-1400°C exhibit the best ceramic characteristics. The (Ba 0.5 Sr 0.5 )Nb 2 O 6 solid solution is found to be a ferroelectric with a diffuse phase transition. The possibility of fabricating Ba 0.5 Sr 0.5 Nb 2 O 6 thin films from ceramic targets prepared in the resulting optimum regimes is shown.

Structurization, Phase Rule Diagram, Relaxation Processes and Radio-Absorbing Properties of Solid Solutions Based on a Binary System BaNb2O6-SrNb2O6

“…for a series of samples burned at (1570 ÷ 1670) K showed that ceramics obtained at the T sint. = 1650K (Figure 1) [9] have the highest density, which was confirmed by measurements of the ε/ε 0 dependences on T in the heat-cool regime (f = 500 kHz): the largest peaks ε/ε 0 , the smallest temperature hysteresis at temperatures below the Curie temperature (T c ), and its absence above T c is characteristic precisely for ceramics prepared at this T sint. (Figure 2a).…”

Parameter of dielectric loss distribution in the new model for complex conductivity based on Havriliak–Negami formula

“…Now, we have a new platform which will help to describe phase transitions of the complex relaxation pattern of nonlinear dielectric including materials based on lead-free components. [12][13][14] In fact, the coefficients α and β, which are written down as (9) and (20), depend on the end value of the imaginary and the real parts of the dielectric permittivity. Calculated at different frequencies, they, as we can say, acquire a new physical sensethe frequency distribution of losses in substance in the dependence on temperature.…”

“…Considering (16), as well as the expressions for the Q-factor Q ¼ γ 00 =γ 0 , we can have Eq. (14) in the following way:…”