Abstract
In this contribution, the effect of \(\hbox {P}_{2}\hbox {O}_{5}\) and \(\hbox {SiO}_{2}\) addition on the phase, microstructure, and electrical properties of \(\hbox {KNbO}_{3}\) was studied. Sample powders with the general formula \((1-x)\hbox {KNbO}_{3}\cdot x\hbox {P}_{2}\hbox {O}_{5}\,(x = 0.03, 0.05)\) and \((1-x)\hbox {KNbO}_{3}\cdot x\hbox {SiO}_{2}\,(x = 0.1)\) were prepared via mixed-oxide route. The thermal behavior of the mixed-milled powder was investigated by thermogravimetry and differential thermal analysis which revealed an overall weight loss of 33.4 wt % in the temperature range of \(30\le T \le 1200\,^\circ\)C and crystallization exotherm occurring at about 795 °C. The present results indicated that \(\hbox {P}_{2}\hbox {O}_{5}\) acted as a sintering aid and lowered the sintering temperature by about 30 °C and promoted densification of \(\hbox {KNbO}_{3}\). Sample compositions at various stages of processing were characterized using X-ray diffraction. Samples sintered at \(T \le\) 1020 °C revealed mainly \(\hbox {KNbO}_{3}\) together with a couple of low-intensity \(\hbox {K}_{3}\hbox {NbO}_{4}\) peaks as a secondary phase. The scanning electron micrographs of \((1-x)\hbox {KNbO}_{3}\cdot x\hbox {SiO}_{2}\,(x = 0.1)\) samples showed a slight increase in the average grain size from 3.76 ± 0.37 to 3.86 ± 0.74 \(\upmu\)m with an increase in sintering temperature from 1000 to 1020 °C. Strong variations in dielectric constant and loss tangent were observed due to \(\hbox {P}_{2}\hbox {O}_{5}\) and \(\hbox {SiO}_{2}\) addition as well as frequency of the applied AC signals.
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Authors greatly acknowledge the financial support from the Higher Education Commission (HEC) of Pakistan and laboratory support extended by MRL, Department of Physics, University of Peshawar, Pakistan.
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Ullah, S., Ullah, I., Iqbal, Y. et al. Influence of P2O5 and SiO2 Addition on the Phase, Microstructure, and Electrical Properties of KNbO3. Iran J Sci Technol Trans Sci 43, 1981–1987 (2019). https://doi.org/10.1007/s40995-018-0665-y
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DOI: https://doi.org/10.1007/s40995-018-0665-y