五氢氧化铌 | 19132-56-0

• 分子结构分类: 无机化合物 - 混合金属/非金属化合物 - 过渡金属氧阴离子化合物
• 中文名称: 五氢氧化铌
• 英文名称: niobium(V) hydroxide
• 英文别名: niobium hydroxide；Niobium pentahydroxide；niobium(5+);pentahydroxide
• CAS: 19132-56-0
• 化学式: H₅NbO₅
• 分子量: 177.943
• InChiKey: WPCMRGJTLPITMF-UHFFFAOYSA-I

计算性质

• 辛醇/水分配系数(LogP)：
  -0.89
• 重原子数：
  6
• 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：
  5
• 氢给体数：
  5
• 氢受体数：
  5

反应信息

• 作为反应物：
  描述：

  五氢氧化铌 在 H₂ 作用下， 以 neat (no solvent) 为溶剂， 生成 niobium(IV) oxide
  参考文献：
  名称：

  Gmelin Handbuch der Anorganischen Chemie, Gmelin Handbook: Nb: MVol.B1, 15, page 32 - 34

  摘要：

  DOI：
• 作为产物：
  描述：

  potassium niobate 在 HNO₃ 作用下， 以 水 为溶剂， 生成 五氢氧化铌
  参考文献：
  名称：

  Properties of Ultrafine-Grained Na0.5K0.5NbO3 Ceramics Prepared From Nanopowder

  摘要：

  In this paper, highly pure Na0.5K0.5NbO3 nanopowder was prepared from an economical sol-gel method. Using the nanopowder, dense Na0.5K0.5NbO3 ceramics with ultrafine grain sizes in the range of 200-600 nm were fabricated successfully by low-temperature solid-state sintering at 1085 degrees C for 4 h. The ultrafine-grained ceramics exhibited fine ferroelectric, piezoelectric, and dielectric characteristics. Its room temperature d(33), K-p, epsilon T-33/epsilon(0) at 1 kHz, tan delta and relative density are 154 pC/N, 30.5%, 407%, 0.0155%, and 96.8%, respectively. The results indicate that it is considerably potential to synthesize ultrafine-grained doped potassium-sodium niobate ceramics with excellent properties by using of nanopowder prepared from the sol-gel method.

  DOI：

  10.1111/j.1551-2916.2011.04534.x

文献信息

• Synthesis, characterization, and microwave dielectric properties of Mg4Nb2O9 ceramics produced through the aqueous sol–gel process
  作者：H.T. Wu、L.X. Li、Q. Zou、Q.W. Liao、P.F. Ning、P. Zhang

  DOI：10.1016/j.jallcom.2010.10.191

  日期：2011.2

  Abstract Microwave dielectric ceramics of Mg4Nb2O9 were prepared by the sol–gel method and their microwave dielectric properties and microstructure were investigated in this study. Firstly, highly reactive nanosized magnesium niobate powders were successfully synthesized at 550 °C in oxygen atmosphere with particle size of 30–40 nm. And the phase formation was investigated by means of DTA–TG and XRD

  摘要 本研究采用溶胶-凝胶法制备了Mg4Nb2O9微波介电陶瓷，并对其微波介电性能和微观结构进行了研究。首先，在氧气气氛中，在550°C下成功合成了粒径为30-40 nm的高反应性纳米铌酸镁粉末。并通过 DTA-TG 和 XRD 分析研究相形成。随后，研究了 Mg4Nb2O9 陶瓷在 1150°C 至 1325°C 的各种烧结温度下的烧结能力和微波介电性能。随着烧结温度从 1150 °C 升高到 1325 °C，密度值、ɛr 值和 Qf 值增加并在 1250 °C 时饱和，而 Qf 值在烧结温度高于 1300 °C 时下降。 τf 值范围从 -48。7 至 -37.8 ppm/°C。由于密度增加和适当的晶粒生长，在 1250 °C 下烧结的 Mg4Nb2O9 陶瓷具有优异的微波介电性能，ɛr = 12.3，Qf = 165,000 GHz 和 τf = -47.5 ppm/°C。结果表明，溶胶-凝胶工艺显着降低了烧结温度。
• Combined synthesis methods for producing LaNbO4 ceramics and investigation of microwave dielectric properties based on complex chemical bond theory
  作者：Mi Xiao、Peng Zhang、Jie Lou、Yanshuang Wei、Ping Zhang

  DOI：10.1016/j.jallcom.2019.152154

  日期：2020.1

  Abstract Highly reactive LaNbO4 nanopowders with particle sizes of 20–50 nm were synthesized at 700 °C through the citric gel process. Niobium oxalate was used as raw material for the first time, which provided a more convenient and precise way for the whole process. In order to reduce the sintering temperature of the LaNbO4 ceramic without introducing other impurities, LaNbO4 nanopowders were added

  摘要 通过柠檬酸凝胶工艺在 700 °C 下合成了粒径为 20-50 nm 的高反应性 LaNbO4 纳米粉末。首次以草酸铌为原料，为整个工艺流程提供了更为便捷、精准的途径。为了在不引入其他杂质的情况下降低LaNbO4陶瓷的烧结温度，加入了LaNbO4纳米粉体以在较低温度下使陶瓷致密化。当添加不同质量百分比x wt%（x = 0, 0.5, 1, 2, 4）的纳米粉体时，通过常规固相反应方法制备的LaNbO4陶瓷的烧结温度成功降低了100°C以上。所得陶瓷具有良好的微波介电性能。Rietveld 精修用于研究样品的晶体结构。利用P-VL理论计算并分析了键离子度与介电常数(er)、晶格能与Q×f0值、键能和谐振频率温度系数(τf)之间的关系。含有 1 wt% LaNbO4 纳米粉末添加剂的 LaNbO4 陶瓷在 1275 °C 下烧结 4 小时，显示出优异的微波介电性能：er = 20.26，Q×f0
• Facile synthesis of nanostructured TiNb₂O₇ anode materials with superior performance for high-rate lithium ion batteries
  作者：Shuaifeng Lou、Yulin Ma、Xinqun Cheng、Jinlong Gao、Yunzhi Gao、Pengjian Zuo、Chunyu Du、Geping Yin

  DOI：10.1039/c5cc07052j

  日期：——

  The one-dimensional nanostructured TiNb₂O₇ exhibited excellent electrochemical performance with superior reversible capacity, rate capability and cyclic stability.

  一维纳米结构的TiNb₂O₇表现出优异的电化学性能，具有出色的可逆容量、倍率性能和循环稳定性。
• Sol-gel synthesis of lithium niobate doped by zinc and boron and study of the luminescent properties of ceramics LiNbO3: Zn: B
  作者：S. M. Masloboeva、M. V. Smirnov、M. N. Palatnikov

  DOI：10.1007/s11172-020-2853-0

  日期：2020.5

  A technological scheme was developed for the sol-gel synthesis of lithium niobate doped by zinc and boron with sol-gel method, and the optimal conditions at each stage of the process were determined. The limiting concentrations of doping impurities, at which a single-phase charge can be synthesized, were established. A ceramic composition LiNbO3: Zn: B with a bulk weight of ~2.3 g cm−3 is formed during

  制定了溶胶-凝胶法溶胶-凝胶合成锌硼掺杂铌酸锂的工艺方案，并确定了工艺各阶段的最佳条件。确定了可以合成单相电荷的掺杂杂质的极限浓度。在 1100 ?? 下热处理水合物残留物的过程中，形成了体积重量约为 2.3 g cm-3 的陶瓷组合物 LiNbO3: Zn: B。并曝光 3 小时。由于所提出的方法，产品质量可以提高并且LiNbO3:Zn:B陶瓷的合成成本最小化。基于溶胶-凝胶法合成的电荷混合物制备的电荷对陶瓷发光性能的研究表明，铌酸锂结构中的硼是高能可见光谱范围内的发光活化剂。所得结果可为晶体和陶瓷新功能材料的生产技术提供依据。
• Synthesis and characterization of nanoporous Bi₃NbO₇films: application to photoelectrochemical water splitting
  作者：Jiangang Jiang、Meng Wang、Qingyun Chen、Shaohua Shen、Mingtao Li、Liejin Guo

  DOI：10.1039/c3ra47118g

  日期：——

  Nanostructured Bi3NbO7 films were successfully prepared via an ultrasonic spray pyrolysis method by using Bi(NO3)3·5H2O and Nb2O5 as precursors. The as-prepared films were systematically characterized by X-ray diffraction, Atomic Force Microscopy (AFM), field emission scanning electron microscopy (FESEM), UV-vis absorption spectra and X-ray photoelectron spectroscopy. The characterization results revealed that the nanostructured Bi3NbO7 possessed a cubic structure, nanoporous morphology and a visible light absorption with an optical band gap of about 2.8 eV. Moreover, electrochemical and photoelectrochemical measurements were carried out and a maximum photocurrent density of 2.8 μA cm−2 at the potential of 0.7 V vs. SCE was obtained for the Bi3NbO7 film deposited at 350 °C. The improvement of the film photoelectrochemical properties was contributed by novel nanoporous morphology that supply sufficient electrode–solution contact area. By addition of methanol into the solution, the photocurrent increased by 60%. The photoelectrochemical results reveal that the prepared films have the potential for hydrogen production via splitting water.

  成功通过超声喷雾热解法制备了纳米结构Bi3NbO7薄膜，采用Bi(NO3)3·5H2O和Nb2O5作为前驱体。对所制备的薄膜进行了系统的表征，包括X射线衍射、原子力显微镜（AFM）、场发射扫描电子显微镜（FESEM）、紫外-可见光吸收光谱和X射线光电子能谱。表征结果表明，纳米结构的Bi3NbO7具有立方结构、纳米多孔形态，并且在可见光下具有约2.8 eV的光学带隙。此外，进行了电化学和光电化学测量，获得了在与饱和甘汞电极（SCE）对比下，在0.7 V电位下，Bi3NbO7薄膜的最大光电流密度为2.8 μA cm−2。薄膜光电化学性质的改善归因于新颖的纳米多孔形态，它提供了足够的电极-溶液接触面积。向溶液中添加甲醇后，光电流增加了60%。光电化学结果表明，制备的薄膜具有通过分解水产氢的潜力。