Barium Strontium Bismuth Niobate Layered Perovskites: Dielectric, Impedance and Electrical Modulus Characteristics

Abstract

SrBi 2 Nb 2 O 9 (SBN) is a bismuth layered perovskite compound, due to its relatively high Curie temperature, has potential application as high ceramic transducer. Also, it is an attractive ferroelectric material that is being considered in non-volatile random access memory cells. Present article describes preparation, dielectric, impedance and modulus characteristics. Temperature and frequency dependence of dielectric permittivity, impedance and electric modulus of barium strontium bismuth niobate (Ba 0.1 Sr 0.9 Bi 2 Nb 2 O 9 , BSBN) have been studied in the range of 35-590• C and 45 Hz-5 MHz, respectively. The structural analysis of compound revealed orthorhombic at room temperature. Complex impedance Cole-Cole plots are used to interpret the relaxation mechanism. These plots shows the relaxation behavior as non-Debye type. By using the Cole-Cole plots grain and grain boundary contributions towards conductivity have been estimated. From electrical modulus formalism polarization and conductivity relaxation behavior in BSBN have been discussed. DC and AC conductivity measurements have been performed on BSBN.

Frequency-dependant Dielectric Characteristics and Conductivity Behavior of Sr1-x(Na0.5Bi0.5)xBi2Nb2O9 (x = 0.0, 0.2, 0.5, 0.8 and 1.0) Ceramics

“…To better understand these phenomena, The complex dielectric constant as a function of the frequency ω in accordance with the Jonscher's power law is given by the following expression 9,18 :…”

Hole/electron transport layers in tin-doped SBLN nano materials for hybrid solar cell applications

“…It can be concluded that real impedance Z' is independent of frequency and doping content (x) beyond 1kHz. The higher Z' values at low frequencies in samples with 10 and 20% tin is because of low mass space charge from PNR dominant microstructure of 10 and 20% tin doped SSBLN compositions [27][28][29], also seen in Fig.4. Fig.7(b) shows a very interesting variation of Z"…”

A High-Energy Ball Milling as a Useful Technique for the Synthesis of CaCu3Ti4O12Electroceramics

“…A similar description of dielectric relaxation is represented in the case of an electrical modulus but the maximum M (ν) is shifted to a higher frequency in respect of the ε (ν) maximum [40]. the source of the potential barrier is related to the Cu ions, which segregate themselves into the grain boundaries.…”