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题名: Low defect density, high surface area LaNbON2 prepared via nitridation of La3NbO7
作者: Wan, Lipeng1, 2;  Xiong, Feng-Qiang2;  Li, Yue1, 2;  Thomas, Tiju3;  Che, Ruxin1;  Yang, Minghui2
关键词: Solar energy materials ;  Defects ;  Porous materials
刊名: MATERIALS LETTERS
发表日期: 2017-02-01
DOI: 10.1016/j.matlet.2016.11.012
卷: 188, 页:212-214
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Technology ;  Physical Sciences
类目[WOS]: Materials Science, Multidisciplinary ;  Physics, Applied
研究领域[WOS]: Materials Science ;  Physics
英文摘要: The presence of low-valent Nb-based point defects and low surface area are common issues within niobium oxynitrides. Herein, La3NbO7 which has richer basic oxide and lower positive Mulliken charge on Nb(V) than LaNbO4, was prepared via NaCl-KCl mixed flux synthesis and converted to perovskite-type LaNbON2 via thermal ammonolysis. Removal of secondary product La2O3 from ammonolysis of La3NbO7 gives rise to additional nanopores in LaNbON2 besides the pores resulted from nitridation. This makes a bigger specific surface area (23 m(2)/g) than conventional LaNbON2 prepared from LaNbO4 (11 m(2)/g). Moreover, UV-vis spectrum of LaNbON2 from La3NbO7 reveals much lower defect absorption than LaNbON2 from LaNbO4; thermogravimetric analysis shows that the mass-gain stage attributed to oxidation of low-valent Nb is present in curve of LaNbON2 from LaNbO4 while absent in that of LaNbON2 from La3NbO7. These indicate that the formation of low-valent Nb defects in LaNbON2 is inhibited when using La3NbO7 as precursor.
关键词[WOS]: PEROVSKITES ;  METALS
语种: 英语
WOS记录号: WOS:000390740500057
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/151849
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 Mat Sci & Engn, Coll Environm & Chem 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.Indian Inst Technol Madras, Dept Met & Mat Engn, Chennai 600036, Tamil Nadu, India

Recommended Citation:
Wan, Lipeng,Xiong, Feng-Qiang,Li, Yue,et al. Low defect density, high surface area LaNbON2 prepared via nitridation of La3NbO7[J]. MATERIALS LETTERS,2017,188:212-214.
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