Synthesis,characterisation and dielectric properties of low-loss Zr-doped barium strontium titanate materials |
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Abstract: | ABSTRACTA series of materials of the composition Ba0.7Sr0.3ZrxTi(1???x)O3 (BSZT), where x?=?0.00, 0.01, 0.02 and 0.03, were synthesised through the sol–gel method whereupon the manifestations of partial substitution of Ti4+ by Zr4+ on the structural and dielectric behaviour of Ba0.7Sr0.3TiO3 (BST) were studied. X-ray diffraction patterns of all samples showed the development of a single-phase crystalline perovskite structure. The dielectric behaviour of the ceramic samples has been studied in detail in the frequency range 10 Hz to 1 MHz at room temperature, and as a function of increase in temperature. The sample with 2% Zr recorded the highest dielectric constant. The dielectric loss values for all the BSZT compositions are remarkably low, tan?δ?=?0.021~0.026 at 1 MHz, in contrast to the literature reports. It is observed that small amount of Zr doping on BST, where 0?x?≤?0.03 results in the enhancement of dielectric constant while decreasing the bulk density and dielectric loss. |
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Keywords: | Sol–gel Zr-substituted BST tetragonal phase dielectric loss Curie temperature lead-free |
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