Crystallization studies and dielectric properties of (Ba_0.7Sr_0.3)TiO₃in bariumaluminosilicate glass

Abstract

Ferroelectric glass–ceramics with a basic composition (1 − y)(Ba0.70Sr0.30)TiO3 : y(BaO : Al2O3 : 2SiO2) have been synthesized by the sol–gel method. The major crystalline phase is the perovskite. The crystallization of the ferroelectric phase in the glass matrix have been studied using differential thermal analysis and x-ray diffraction and the kinetic parameters characterizing the crystallization have been determined using an Arrhenius model. Glass contents ≤ 5 mol% promoted liquid phase sintering, which reduced the sintering temperature to 1250 °C. The dielectric permittivity of the glass–ceramic samples decreased and the ferroelectric–paraelectric phase transition became more diffuse with increasing glass content. The dielectric connectivity of the ferroelectric phase in the composite have also been investigated and are reported.

Tuning of dielectric, pyroelectric and ferroelectric properties of 0.715Bi0.5Na0.5TiO3-0.065BaTiO3-0.22SrTiO3 ceramic by internal clamping

“…The weakening of the Ti-O bond leads to a weaker distortion of the octahedron and brings about a decrease in the c/a ratio, thus inducing a drop in the Curie temperature, dielectric permittivity and higher dielectric loss. [65][66][67] Further, it is to be noted that 4% ceramic-glass shows highest dielectric loss, which could be the effect of grain size as similar results are also observed by many researcher. 29,[67][68][69] Incorporation of glass into ceramic matrix has been reported to inhibit grain growth.…”

“…These properties can be understood in terms of the effects of the grain size and the creation of oxygen vacancies due to incorporation of glass forming elements within the perovskite structure. [65][66][67] In our case, the effect of substitution of Ba 2+ with Bi 2+ results in changing the bonding force between the A-site ion and the oxygen ion of ABO 3 perovskite structure. The ionic radius of Ba 2+ is larger than that of the Bi 2+ ion.…”

Dielectric behavior of perovskite glass ceramics

“…Thus, borosilicate enhances the dielectric constant of BST glass ceramics. It also lowers the value of T c [160,161]. The transition temperature decreases with increasing samarium content in BST ceramics.…”

Low temperature sintering and dielectric properties of Ba0.6Sr0.4TiO3–MgO composite ceramics with CaO–B2O3–SiO2 glass addition

“…The formation of the Ba 2 TiSi 2 O 8 secondary phase was also reported by Divya [16] and Dou Zhang [3], which are consistent with our results. According to their research, such phase in the BST-based ceramics would occur when borosilicate glass content was over 5 mol% and the firing temperature was above 850 • C. It is common for the formation of Ba 2 TiSi 2 O 8 secondary phase in the BST-based ceramics when introducing the glass composition containing SiO 2 [16][17][18]. With increasing the glass content, the secondary phases Ca 4 Ti 3 O 10 and BaCa 2 Mg (SiO 4 ) 2 were observed.…”