potassium niobate

• 分子结构分类: 无机化合物 - 混合金属/非金属化合物 - 碱金属有机物
• 英文名称: potassium niobate
• 英文别名: potassium;oxido(dioxo)niobium
• 化学式: K*NbO₃
• 分子量: 180.003
• InChiKey: UKDIAJWKFXFVFG-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  -4.43
• 重原子数：
  5
• 可旋转键数：
  0
• 环数：
  0.0
• sp3杂化的碳原子比例：
  0.0
• 拓扑面积：
  57.2
• 氢给体数：
  0
• 氢受体数：
  3

反应信息

• 作为反应物：
  描述：

  potassium niobate 、 五氯化铌 在 柠檬酸 作用下， 以 水 、 双氧水 为溶剂， 生成 potassium acetate
  参考文献：
  名称：

  Catalytic oxidation of soot over alkaline niobates

  摘要：

  The lack of studies in the current literature about the assessment of alkaline niobates as catalysts for soot oxidation has motivated this research. In this study, the synthesis, characterization and assessment of alkaline metal niobates as catalysts for soot combustion are reported. The solids MNbO3 (M = Li, Na, K, Rb) are synthesized by a citrate method, calcined at 450 degrees C, 550 degrees C, 650 degrees C, 750 degrees C, and characterized by AAS, N-2 adsorption, XRD, O-2-TPD, FTIR and SEM. All the alkaline niobates show catalytic activity for soot combustion, and the activity depends basically on the nature of the alkaline metal and the calcination temperature. The highest catalytic activity, expressed as the temperature at which combustion of carbon black occurs at the maximum rate, is shown by KNbO3 calcined at 650 degrees C. At this calcination temperature, the catalytic activity follows an order dependent on the atomic number, namely: KNbO3 > NaNbO3 > LiNbO3. The RbNbO3 solid do not follow this trend presumably due to the perovskite structure was not reached. The highest catalytic activity shown by of KNbO3, despite the lower apparent activation energy of NaNbO3, stress the importance of the metal nature and suggests the hypothesis that K+ ions are the active sites for soot combustion. It must be pointed out that alkaline niobate subjected to consecutive soot combustion cycles does not show deactivation by metal loss, due to the stabilization of the alkaline metal inside the perovskite structure. (C) 2012 Elsevier B. V. All rights reserved.

  DOI：

  10.1016/j.jallcom.2012.10.015
• 作为产物：
  描述：

  potassium-niobium ethoxide 生成 potassium niobate
  参考文献：
  名称：

  NAZERI-ESHGHI, AZAR;KUANG, A. X.;MACKENZIE, J. D., J. MATER. SCI., 25,(1990) N, C. 3333-3337

  摘要：

  DOI：

文献信息

• Morphology and polarization-dependent second harmonic generation in single hexagonal sodium niobate micro/nano-crystals
  作者：Quanlan Xiao、Wei Lin、Gengxu Chen、Chengjie Ding、Guoping Dong、Chensheng Lin、Botao Wu、E. Wu、Heping Zeng、Jianrong Qiu

  DOI：10.1039/c5tc00226e

  日期：——

  The SHG responses from single hexagonal NaNbO₃ micro/nano-crystals with different morphologies and sizes were studied in detail. It was demonstrated that the same crystal structure displays a similar SHG response.

  单个六角NaNbO3微/纳米晶体具有不同的形态和尺寸，其二次谐波响应进行了详细研究。结果表明，相同的晶体结构显示出相似的二次谐波响应。
• Size dependence of the polarization and dielectric properties of KNbO₃ nanoparticles
  作者：Haiyan Ge、Yuanye Huang、Yudong Hou、Han Xiao、Mankang Zhu

  DOI：10.1039/c4ra03613a

  日期：——

  The spontaneous polarization and dielectric constant of nanocrystalline KNbO₃ were strongly influenced by the particle size, and reached at the highest value at 100 nm. The present work is useful to study other ferroelectric nanoscale materials.

  纳米晶 KNbO3 的自发极化和介电常数受粒径的影响很大，在 100 nm 时达到最高值。本研究成果对研究其他铁电纳米材料很有帮助。
• Potassium niobate nanostructures: controllable morphology, growth mechanism, and photocatalytic activity
  作者：Linqin Jiang、Yu Qiu、Zhiguo Yi

  DOI：10.1039/c2ta01056a

  日期：——

  Various potassium niobate (KNbO3) nanostructures, including nanowires, nanotowers, nanocubes and nanorods, were successfully fabricated through rather facile hydrothermal processes. By adjusting the concentration of potassium hydroxide, reaction temperature and reaction time, the product morphologies can be easily controlled. High crystallinity as well as the active (001) crystal plane exposed on KNbO3 nanocrystals offer enhanced photocatalytic activity for rhodamine B decomposition in aqueous solutions under UV-visible light irradiation. The level of photocatalytic activity depends strongly on the microstructure of KNbO3 and the photoreactivity towards RhB degradation follows the order of KNbO3 nanocubes > nanowires > nanorods > nanotowers. The KNbO3 nanocubes prepared at 200 °C for 7 days in the presence of 6.5 M KOH exhibited the enhanced photocatalytic performance for the degradation of RhB to 89% after 240 min of irradiation under a sunlight simulator.

  各种铌酸钾（KNbO3）纳米结构，包括纳米线、纳米塔、纳米立方体和纳米棒，都是通过相当简便的水热法工艺成功制备的。通过调节氢氧化钾的浓度、反应温度和反应时间，可以轻松控制产物的形态。在紫外可见光照射下，KNbO3 纳米晶体的高结晶度和活性（001）晶面可增强其在水溶液中分解罗丹明 B 的光催化活性。光催化活性的高低在很大程度上取决于 KNbO3 的微观结构，其降解罗丹明 B 的光活性依次为 KNbO3 纳米立方体 > 纳米线 > 纳米棒 > 纳米塔。在 6.5 M KOH 的存在下，于 200 °C 制备 7 天的 KNbO3 纳米立方体在太阳光模拟器下照射 240 分钟后，其降解 RhB 的光催化性能增强至 89%。
• KNbO₃photoelectrode for DSSC: a structural, optical and electrical approach
  作者：Silvia Cucatti、Luciano Timm Gularte、Cristian Dias Fernandes、Ramon Dadalto Carvalho、Mateus Meneghetti Ferrer、Pedro Lovato Gomes Jardim、Cristiane Wienke Raubach、Sérgio da Silva Cava、Mario Lucio Moreira

  DOI：10.1039/d3dt00864a

  日期：——

  In this work, we present the potassium niobate (KNbO₃) nanoparticles as a suitable mesoporous photoelectrode for dye-sensitized solar cells (DSSCs).

  在这项工作中，我们将铌酸钾（KNbO3）纳米粒子作为染料敏化太阳能电池（DSSC）的合适介孔光电极。
• WU, E. T.;KUANG, A. X.;MACKENZIE, J. D., ISAF86: PROC. 6TH IEEE INT. SYMP. APPL. FERROELEC., BETHLEHEM, PA, 8-11 J+
  作者：WU, E. T.、KUANG, A. X.、MACKENZIE, J. D.

  DOI：——

  日期：——