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Wang, Xu-ping; Li, Qing-gang; Yang, Yu-guo; Zhang, Yuan-yuan; Lv, Xian-shun; Wei, Lei; Liu, Bing; Xu, Jian-hua; Ma, Ling; Wang, Ji-yang
Journal of materials science. Materials in electronics, 12/2016, Volume: 27, Issue: 12Journal Article
KTa0.63Nb0.37O3 and Cu doped KTa0.63Nb0.37O3 single crystals were grown by the Czochralski method. The phase, optical and electric properties were characterized. The differences of XRD and color for KTa0.63Nb0.37O3 and Cu doped KTa0.63Nb0.37O3 single crystals are observed. Emission bands corresponding to Cu0 and Cu+ except of emission bands originating from KTa0.6Nb0.4O3 host were observed in the emission spectra of the KTa0.63Nb0.37O3:Cu single crystals. On the basis of these differences, we speculate the dominating existence of Cu0 and residual existence of Cu+ in KTa0.63Nb0.37O3 single crystal. The existence of Cu0 in KTa0.63Nb0.37O3 single crystal influences the optical and dielectric properties of crystal. The higher dielectric constant of Cu doped KTa0.63Nb0.37O3 single crystal than that of pure KTa0.63Nb0.37O3 single crystal is induced by the decrease of the resistance of the grain.
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