Journal
PHASE TRANSITIONS
Volume 92, Issue 7, Pages 642-656Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/01411594.2019.1616195
Keywords
Curie temperature; impedance spectroscopy; relaxation phenomenon; conductivity
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PbBi2Ta2O9 ceramic samples were fabricated by high-temperature mixed oxide method. X-ray diffraction determines the structure as orthorhombic. The scanning electron microscopy confirms the formation of densely packed grains in the sample. The dielectric measurements, complex impedance and complex modulus study were carried out in a frequency range of 1 kHz-1 MHz and a temperature rangeof 25-500 degrees C. The conduction mechanism of the material is discussed in details using variable range hoping, nearest neighbor hopping relaxation model and dc activation energy at two different temperature regimes. From the J-E characteristics studies, the occurrence of non-linear curves endorses the non-Ohmic nature of the material.
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