Structural evolution in a hydrothermal reaction between Nb2O5 and NaOH solution: From Nb2O5 grains to microporous Na2Nb2O6 center dot(2)/3H2O fibers and NaNbO3 cubes
文献类型：期刊论文
| 作者 | Zhu, HY; Zheng, ZF; Gao, XP; Huang, YN; Yan, ZM; Zou, J; Yin, HM; Zou, QD; Kable, SH; Zhao, JC |
| 刊名 | JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
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| 出版日期 | 2006-02-22 |
| 卷号 | 128期号:7页码:2373-2384 |
| ISSN号 | 0002-7863 |
| DOI | 10.1021/ja056301w |
| 英文摘要 | Niobium pentoxide reacts actively with concentrate NaOH solution under hydrothermal conditions at as low as 120 degrees C. The reaction ruptures the corner-sharing of NbO7 decahedra and NbO6 octahedra in the reactant Nb2O5, yielding various niobates, and the structure and composition of the niobates depend on the reaction temperature and time. The morphological evolution of the solid products in the reaction at 180 degrees C is monitored via SEM: the fine Nb2O5 powder aggregates first to irregular bars, and then niobate fibers with an aspect ratio of hundreds form. The fibers are microporous molecular sieve with a monoclinic lattice, Na2Nb2O6 center dot(2)/3H2O. The fibers are a metastable intermediate of this reaction, and they completely convert to the final product NaNbO3 Cubes in the prolonged reaction of 1 h. This study demonstrates that by carefully optimizing the reaction condition, we can selectively fabricate niobate structures of high purity, including the delicate microporous fibers, through a direct reaction between concentrated NaOH solution and Nb2O5. This synthesis route is simple and suitable for the large-scale production of the fibers. The reaction first yields poorly crystallized niobates consisting of edge-sharing NbO6 octahedra, and then the microporous fibers crystallize and grow by assembling NbO6 octahedra or clusters of NbO6 octahedra and NaO6 units. Thus, the selection of the fibril or cubic product is achieved by control of reaction kinetics. Finally, niobates with different structures exhibit remarkable differences in light absorption and photoluminescence properties. Therefore, this study is of importance for developing new functional materials by the wet-chemistry process. |
| 语种 | 英语 |
| WOS记录号 | WOS:000235562900057 |
| 出版者 | AMER CHEMICAL SOC |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/59413]  |
| 专题 | 中国科学院化学研究所 |
| 通讯作者 | Zhu, HY |
| 作者单位 | 1.Univ Queensland, Sch Phys & Chem Sci, Inorgan Mat Res Program, Brisbane, Qld 4001, Australia 2.Nankai Univ, Dept Med Chem, Inst New Energy Mat Chem, Tianjin 300071, Peoples R China 3.Univ Western Ontario, Dept Chem, London, ON N6A 5B7, Canada 4.Univ Queensland, Sch Engn, Brisbane, Qld 4072, Australia 5.Univ Queensland, Ctr Microanalysis & Microscopy, Brisbane, Qld 4072, Australia 6.Univ Sydney, Sch Chem, Sydney, NSW 2006, Australia 7.Chinese Acad Sci, Inst Chem, Beijing 100080, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhu, HY,Zheng, ZF,Gao, XP,et al. Structural evolution in a hydrothermal reaction between Nb2O5 and NaOH solution: From Nb2O5 grains to microporous Na2Nb2O6 center dot(2)/3H2O fibers and NaNbO3 cubes[J]. JOURNAL OF THE AMERICAN CHEMICAL SOCIETY,2006,128(7):2373-2384. |
| APA | Zhu, HY.,Zheng, ZF.,Gao, XP.,Huang, YN.,Yan, ZM.,...&Frost, RL.(2006).Structural evolution in a hydrothermal reaction between Nb2O5 and NaOH solution: From Nb2O5 grains to microporous Na2Nb2O6 center dot(2)/3H2O fibers and NaNbO3 cubes.JOURNAL OF THE AMERICAN CHEMICAL SOCIETY,128(7),2373-2384. |
| MLA | Zhu, HY,et al."Structural evolution in a hydrothermal reaction between Nb2O5 and NaOH solution: From Nb2O5 grains to microporous Na2Nb2O6 center dot(2)/3H2O fibers and NaNbO3 cubes".JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 128.7(2006):2373-2384. |
入库方式： OAI收割
来源：化学研究所
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