Study of diffuse phase transition and relaxor ferroelectric behavior of Ba_0.97Bi_0.02Ti_0.9Zr_0.05Nb_0.04O₃ ceramic

Abstract

In the present work, structural property of polycrystalline sample Ba0.97Bi0.02Ti0.9Zr0.05Nb0.04O3 (BBTZN) prepared by a molten-salt method were investigated.

Structure properties and dielectric relaxation of Ca0.1Na0.9Ti0.1Nb0.9O3 ceramic

“…( T C ≠ T 0 ) shows that the phase transition is of a first order type. 55 The broadened peaks correspond to the diffuse type transition in this composition, a distinctive feature of a disordered perovskite structure.…”

Studies on structural, dielectric and optical properties of (Ba0.95Ca0.05)1−x(Ti0.8Sn0.2)1−xNaxNbxO3 lead-free ceramics

“… 39 where c denotes the Curie constant and 1 < γ < 2 is defined as the diffuseness degree indicator of the character of the phase transition. 40 Linear relationships are observed in the plot of as a function of log( T − Tm) at 10 kHz frequency for the compositions x = 0.75 and x = 0.8 as shown in ( Fig. 7a and b ).…”

“…where c denotes the Curie constant and 1 < g < 2 is dened as the diffuseness degree indicator of the character of the phase transition. 40 Linear relationships are observed in the plot…”

Microstructure and electrical properties of microwave sintered Nb-doped NBT ceramics

“…Based on the Smolensky-Isupov's theory of DPT, it can be concluded that with the increase in dopant concentration, the competition between occupancy of the same B-site with parent Ti and dopant Nb increases, which causes an increase in composition fluctuation of different polar micro-regions and hence increase in DPT nature. Coexistence of multiions at B-site also tends to cause inhomogeneous distribution and disordered crystal structure [29], which can account diffuse phase transition of the Nb-doped NBT ceramics.…”