Articles written in Bulletin of Materials Science

    • Investigation on the structural, electrical and thermistor parameters of La-doped BiFeO$_3$–PbZrO$_3$ for energy storage devices


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      The solid-state reaction technique was used to prepare the sample 0.5(BiLa$_y$Fe$_{1–y}$O$_3$)–0.5(PbZrO$_3$) at different concentrations y = 0.05, 0.10, 0.15, 0.20. Structural parameters such as percent crystallinity, average crystallitesize, dislocation density and microstrain were calculated from the X-ray diffraction data at room temperature. The scanning electron microscope micrographs reveal the spherical, densely packed natures of the samples with low porosity.The energy density with efficiency of the prepared samples was calculated from P–E loop. The performance of the composites as an NTC thermistor at high temperatures (275–400°C) was discussed. Thermistor constant, sensitivity index and activation energies were calculated to understand the characteristics of the NTC thermistor. The high value of density of states was determined from the frequency and temperature-dependent ac conductivity of the composites.

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