Fabrication and Electrical Properties of Mn-Doped KNbO3 Ceramics Synthesized from KHCO3 as a Starting Material

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Potassium niobate-based ceramics with 0.1 wt % MnCO3, \text{K_{(1+x)}NbO_{3}}+\text{MnCO_{3}} 0.1 wt % (\text{KN10000x}+\text{Mn}, x = 0.0000{\mbox{--}}0.0010), were fabricated using KHCO3 powder as a starting material. The \text{KN10000x}+\text{Mn} ceramics were basically fabricated using a conventional ceramic fabrication process and MnCO3 powders were added at the milling stage after the calcination. High density ratios above 95% were prepared for the wide compositional range of excess K amount for \text{KN10000x}+\text{Mn} ceramics. From these results, Mn ions are thought to act as a sintering aid for KN ceramics. Mn-doped KN10000x ceramics also showed high resisitivities of approximately 10^{12} \Omega cm for the wide variety of x (10000x=0{\mbox{--}}9). Moreover, the electromechanical coupling factors k_{33} for \text{KN10000x}+\text{Mn} had constant values of higher than 0.50.
2012-09-25