Influence of copper oxide on properties of potassium tantalate niobate single crystals. Issue 13 (October 2016) - Liu, Bing
Abstract: KT0.62 N0.38 and KT0.62 N0.38 :Cu single crystals are grown by the Czochralski method. The XRD patterns and electric properties of the obtained single crystals are measured. A clear color difference between KT0.62 N0.38 and KT0.62 N0.38 :Cu single crystals is observed although the XRD results indicate that both of them have a same phase. There is a diffraction peak corresponding to copper in the XRD pattern of KT0.62 N0.38 :Cu single crystals. Combining the brown color and XRD pattern of KT0.62 N0.38 :Cu single crystals, we speculate the dominating existence of Cu° in single crystals. The higher dielectric value is observed in KT0.62 N0.38 :Cu single crystals because that the existence of Cu° in KT0.62 N0.38 :Cu single crystals decreases the resistance of the grain. Moreover, KT0.62 N0.38 :Cu single crystals have the lower hysteresis area, which suggests the decrease of the amount of dissipated energy.