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标题：Effect of Ni-doping Charge on Structure and Properties of LiNbO3
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作者：El Bachiri A. ; El Hasnaoui M. ; Bennani F. 等
期刊名称：Journal of Materials and Environmental Science
印刷版ISSN：2028-2508
出版年度：2016
卷号：7
期号：9
页码：3353-3361
出版社：University of Mohammed Premier Oujda
摘要：Phase formation and structural properties of Ni-doped Li 0.976-x Nb 1.005-x/5 Ni x O 3 (0 ≤ x ≤ 0.1) ceramics prepared by solid-state reaction method, are investigated in a temperature range from 400 to 900 °C. X-ray diffraction patterns indicate that single phase was formed for lithium niobate ceramics. It was shown that the unit-cell volume of the hexagonal phase decreased with increasing nickel concentration from 0 to 3% Ni charge and increased above 3%. No secondary phases were observed in Ni-doped powder of LiNbO 3 for all concentrations compared with that of undoped sample. These results indicate that the Ni 2+ ion was substituted for niobium and lithium ions in the hexagonal phase. The addition of Ni 2+ promotes densification of lithium niobate ceramics. Raman spectra show that the samples were well crystallized with high purity. It was noticed that the increase of Ni-doping causes the decreasing of resistivity at high temperatures, but it has no influence of activation energy.
关键词：Ceramics; Ni;doping charge; solid;state reaction; crystalline structure; electrical resistivity