Barium Strontium Bismuth Niobate Layered Perovskites: Dielectric, Impedance and Electrical Modulus Characteristics |
| M.P. Dasaria, K. Sambasiva Raob, P. Murali Krishnab and G. Gopala Krishnaa
aDepartment of Physics, Gitam Institute of Technology, Gitam University, Visakhapatnam-530 045, India bCentre for Piezoelectric Transducer Materials, Physics Department, Andhra University, Visakhapatnam-530 003, India |
| Received: September 19, 2010; in final form: November 30, 2010 |
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| SrBi2Nb2O9 (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 (Ba0.1Sr0.9Bi2Nb2O9, 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. |
| DOI: 10.12693/APhysPolA.119.387 PACS numbers: 77.84.-s, 77.84.Ek, 72.80.Ng |