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题名: Chloride flux growth of crystalline strontium niobates and nitridation to perovskite SrNbO2N
作者: Li, Yue1, 2;  Xiong, Feng-Qiang2;  Ou, Ruiling1, 2;  Wan, Lipeng1, 2;  Yin, Congling3;  Che, Ruxin1;  Yang, Minghui2
关键词: Perovskites ;  Niobates ;  Strontium niobium ;  Oxynitride ;  Defects
刊名: CERAMICS INTERNATIONAL
发表日期: 2017-07-01
DOI: 10.1016/j.ceramint.2017.03.071
卷: 43, 页:7695-7700
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Technology
类目[WOS]: Materials Science, Ceramics
研究领域[WOS]: Materials Science
英文摘要: Highly crystalline (110) layered perovskite Sr2Nb2O7, (111) layered perovskite Sr5Nb4O15 and complex perovskite Sr4Nb2O9 were prepared by NaCl-KCl flux growth method from SrCO3 and Nb2O5. This flux synthesis achieves single strontium niobate phase in contrast to mixed niobates from the solid state reaction with the same heating parameters. A little excess of Sr source was found to be required for the synthesis of Sr5Nb4O15 and Sr4Nb2O9 at elevated temperature due to slight evaporation. The three strontium niobates were converted to perovskite SrNbO2N via thermal ammonolysis under NH3 flow at 900 degrees C. Post-wash treatment was performed to remove the byproduct SrO. This makes additional nanopores in SrNbO2N in the cases of Sr5Nb4O15 and Sr4Nb2O9, and results in increasing surface areas of SrNbO2N with Sr:Nb ratios in the precursors (from 9.9 to 19.8 and 35.5 m(2)/g). On the other hand, the UV Vis diffusion reflectance spectra reveal decreasing light absorption by defects in SrNbO2N in this order. This suggests fewer low-valent Nb defects in SrNbO2N prepared from precursor with higher Sr:Nb ratio. SrNbO2N prepared from Sr4Nb2O9 would be advantageous for applications that require high surface area and low defect density of the material.
关键词[WOS]: VISIBLE-LIGHT IRRADIATION ;  MOLTEN-SALT SYNTHESIS ;  DIELECTRIC-PROPERTIES ;  LATIO2N CRYSTALS ;  OXYNITRIDE ;  OXIDE ;  PARTICLES ;  SR2NB2O7 ;  SR4NB2O9 ;  SR
语种: 英语
WOS记录号: WOS:000400880000045
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/152313
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Dalian Jiaotong Univ, Coll Environm & Chem Engn, Coll Mat Sci & Engn, Dalian 116028, Peoples R China
2.Chinese Acad Sci, Dalian Inst Chem Phys, Dalian Natl Lab Clean Energy, Dalian 116023, Peoples R China
3.Jiangxi Univ Sci & Technol, Sch Mat Sci & Engn, Ganzhou 341000, Peoples R China

Recommended Citation:
Li, Yue,Xiong, Feng-Qiang,Ou, Ruiling,et al. Chloride flux growth of crystalline strontium niobates and nitridation to perovskite SrNbO2N[J]. CERAMICS INTERNATIONAL,2017,43:7695-7700.
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