niobium(III) oxide

• 分子结构分类: 无机化合物 - 混合金属/非金属化合物 - 过渡金属有机体
• 英文名称: niobium(III) oxide
• 英文别名: niobium oxide；neodymium oxide；Niobium;trihydrate；niobium;trihydrate
• 化学式: Nb₂O₃
• 分子量: 233.811
• InChiKey: QECWETJVWLBCJH-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  -2.48
• 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：
  3
• 氢给体数：
  3
• 氢受体数：
  3

反应信息

• 作为反应物：
  描述：

  niobium(III) oxide 、 五氯化铌 以 melt 为溶剂， 生成 niobium(V) oxide chloride
  参考文献：
  名称：

  不同碱金属氯化物和氯氧化物熔体中五价铌和钽还原产物的电子吸收光谱

  摘要：

  We have studied the electronic absorption spectra of niobium chloride and oxychloride compounds in different oxidation states and of the reduction products of pentavalent niobium and tantalum in various alkali chloride melts at different temperatures up to 1000 K. Furthermore, we present spectra of the corresponding cluster compounds Na4Nb6Cl18 and Na4Ta6Cl18 dissolved in alkali chloride melts at elevated temperatures. It is found that these compounds decompose at these temperatures. In comparing the spectra corresponding to the different oxidation states of the niobium systems, it is concluded that reduction of NbCl5 with excess metal yields Nb(II) or Nb(III), whereas in NbOCl3 the oxidation state IV is stabilized. These spectra are characterized by d-d and charge transfer bands. The optical absorption of TaCl5 reduced with excess metal exhibits the features typical of intervalence charge transfer: an intense asymmetric band at 1.6 eV whose intensity is reduced with temperature. The intensity of this band is correlated with an additional absorption visible in the infrared. These peculiarities of the electronic absorption are qualitatively discussed.

  DOI：

  10.1021/j100054a005
• 作为产物：
  描述：

  bis(guanidinium) (quinoline-2-carboxylato)triperoxoniobate monohydrate 在 air 作用下， 以 neat (no solvent) 为溶剂， 生成 niobium(III) oxide
  参考文献：
  名称：

  Synthesis, structural and DFT studies of a peroxo-niobate complex of the biological ligand 2-quinaldic acid

  摘要：

  The novel heteroleptic complex (gu)(2)[Nb(O-2)(3)(quin-2-c)] center dot H2O (1) has been prepared by substituting a peroxo group by quinoline-2-carboxylate ion in the homoleptic complex (gu)(3)[Nb(O-2)(4)] (2) in the presence of an excess of hydrogen peroxide in aqueous medium (gu(+) = CN3H6 -; quin-2-c = quinoline-2-carboxylate ion). The complexes contain the highly symmetric and planar guanidinium ion as a counter-ion. which exhibits high stability and an extended hydrogen bonding pattern. The crystal structure and the spectral characterization of (gu)(2)[Nb(O-2)(3)(quin-2-c)] center dot H2O have been determined. The ground electronic structure of the complex has been calculated with the density functional theory (DFT) method, and TD-DFT calculations have been employed to interpret the UV-Vis transitions. Compilation of the experimental and theoretical results may permit us to produce additional information about binding and catalytic reactivity. (C) 2008 Elsevier Ltd. All rights reserved.

  DOI：

  10.1016/j.poly.2008.08.006
• 作为试剂：
  描述：

  4-甲基-1-萘 在 niobium(III) oxide 、 氧气 作用下， 以 乙腈 为溶剂， 反应 24.0h， 以24%的产率得到4,4'-dimethyl[2,2']binaphthalenyl-1,1'-diol
  参考文献：
  名称：

  半导体介导的1-萘酚双氧氧化二聚和SnO 2在没有双氧的情况下烯醇醚的O-去甲基化

  摘要：

  在半导体（例如SnO 2，ZrO 2或活性炭）存在下，作为催化剂的1-萘酚1用双氧氧化二聚反应选择性地产生相应的2,2'-联萘酚2或2,2 ′-联萘-1，1′-醌3在没有光照射的情况下具有优异的收率。氧化后，通过适当的再活化处理，可以完全恢复SnO 2的催化活性。另外，不具有双氧的SnO 2催化烯醇醚3至4的选择性O-脱甲基化。

  DOI：

  10.1016/j.tet.2004.09.003

文献信息

• Electronic and spin configurations of Co3+ and Ni3+ ions in oxides of K2NiF4 structure: A magnetic susceptibility study
  作者：R.A. Mohan Ram、K.K. Singh、W.H. Madhuaudan、P. Ganguly、C.N.R. Rao

  DOI：10.1016/0025-5408(83)90097-1

  日期：1983.6

  In La4LiCoO8, Li+ and Co3+ ions are ordered in two dimensions and Co3+ ions undergo transitions from the low-spin to the intermediate as well as the high-spin states. Both Sr4TaCoO8 and Sr4NbCoO8 exhibit low to intermediate-spin state transitions of Co3+ ions. In the system LaSr1−xBaxNiO4, the eg electrons are essentially in extended states forming a σ∗x2−y2 band. With increase in x, the band width

  在 La4LiCoO8 中，Li+ 和 Co3+ 离子在二维中是有序的，Co3+ 离子经历从低自旋态到中间态以及高自旋态的跃迁。Sr4TaCoO8 和 Sr4NbCoO8 都表现出 Co3+ 离子的低至中自旋态跃迁。在系统 LaSr1-xBaxNiO4 中，例如电子基本上处于扩展状态，形成 σ∗x2-y2 带。随着x的增加，带宽随着晶胞体积的增加而减小；随着 x 的增加，少量形成高自旋 Ni3+ 离子，但没有自旋态跃迁。在 LaSrAl1−xNixO4 中，x 较小时，高自旋 Ni3+ 的比例很小；当 x ≈ 0.6 时，c/a 比率突然下降，表明 σ∗x2−y2 带的形成。在 LnSrNiO4 中，C/a 比在 Ln = La 和 Nd 之间急剧下降；
• COMPOUNDS COMPRISING A HIBONITE STRUCTURE AND A METHOD FOR THEIR USE
  申请人：OREGON STATE UNIVERSITY

  公开号：US20160355407A1

  公开（公告）日：2016-12-08

  Novel colored compounds with a hibonite structure and a method for making the same are disclosed. The compounds may have a formula AAl 12-x-y M a x M b y O 19 where A is typically an alkali metal, an alkaline earth metal, a rare earth metal, Pb, Bi or any combination thereof, and M a is Ni, Fe, Cu, Cr, V, Mn, or Co or any combination thereof, and M b is Ti, Sn, Ge, Si, Zr, Hf, Ga, In, Zn, Mg, Nb, Ta, Sb, Mo, W or Te or any combination thereof. Compounds with varying colors, such as blue, can be made by varying A, M a and M b and their relative amounts. Compositions comprising the compounds and methods for making and using the same are also disclosed.

  本发明揭示了一种具有hibonite结构的新型彩色化合物及其制备方法。这些化合物的化学式可能为AAl12-x-yMaxMbyO19，其中A通常是碱金属、碱土金属、稀土金属、Pb、Bi或任意组合，而Ma是Ni、Fe、Cu、Cr、V、Mn或Co或任意组合，Mb是Ti、Sn、Ge、Si、Zr、Hf、Ga、In、Zn、Mg、Nb、Ta、Sb、Mo、W或Te或任意组合。通过改变A、Ma和Mb及其相对量，可以制备出具有不同颜色（例如蓝色）的化合物。本发明还揭示了包含这些化合物的组合物以及制备和使用这些化合物的方法。
• Low temperature sintering of Li2CO3 added Pb(Ni1/3Nb2/3)-Pb(Zr,Ti)O3 ceramics with high piezoelectric properties
  作者：Xiangyu Gao、Haonan Jin、Benjian Xin、Mingwen Wang、Shuxiang Dong、Zhuo Xu、Fei Li

  DOI：10.1016/j.jallcom.2021.162132

  日期：2022.2

  increasing output electric signal for piezoelectric devices. However, it is a challenge to achieve high piezoelectric coefficient at low sintering temperature. In this work, we fabricated Li2CO3 (LC) doped Pb(Ni1/3Nb2/3)-Pb(Zr,Ti)O3 (PNN-PZT) ceramics via solid state reaction method. Piezoelectric coefficient at low quasi-static signal d33 and effective piezoelectric coefficient under high electric field

  多层结构是降低压电器件驱动电压或增加输出电信号的有效途径。然而，在低烧结温度下实现高压电系数是一个挑战。在这项工作中，我们通过固态反应法制备了Li 2 CO 3 (LC) 掺杂的 Pb(Ni 1/3 Nb 2/3 )-Pb(Zr,Ti)O 3 (PNN-PZT) 陶瓷。低准静态信号下的压电系数d 33和高电场下的有效压电系数 d 33 * 为 692 pC/N, 1114 pm/V 对于 PNN-PZT+0.2 wt% LC 在 950 °C 下烧结，与高温烧结商用 Pb(Zr,Ti)O 3(PZT) 基陶瓷。详细研究了压电、铁电、介电特性、温度稳定性和材料结构。平面机电耦合因子 K p、相对介电常数 ε r和介电损耗 tan δ 在 1 kHz、居里温度 T c、矫顽电场 E c下测得为 0.557、4280、0.025、113 °C、4.34 kV/cm . 它在多层结构共烧压电致动器和换能器中显示出巨大的应用潜力。
• Thermal stability of Dion–Jacobson mixed-metal-niobate double-layered perovskites
  作者：Andrew T. Hermann、John B. Wiley

  DOI：10.1016/j.materresbull.2008.10.019

  日期：2009.5

  The thermal stability and decomposition pathways of six Dion-Jacobson-related double-layered perovskites, ALaNbsub 2}Osub 7} (A = H, Li, Na, Ag) and (ACl)LaNbsub 2}Osub 7} (A = Fe, Cu), are investigated. These compounds are made by low temperature (<400 deg. C) ion exchange reactions from RbLaNbsub 2}Osub 7}. All the compounds are low temperature phases with some of them exhibiting decomposition

  六种 Dion-Jacobson 相关双层钙钛矿的热稳定性和分解途径，ALaNbsub 2}Osub 7} (A = H, Li, Na, Ag) 和 (ACl)LaNbsub 2}O sub 7} (A = Fe, Cu) 进行了研究。这些化合物是由 RbLaNbsub 2}Osub 7} 通过低温 (<400 摄氏度) 离子交换反应制成的。所有化合物都是低温相，其中一些表现出与亚稳态一致的分解放热。分解温度和反应途径随 A 的特性而变化，大多数分解导致形成铌酸盐（含 A）和 LaNbOsub 4}。介绍了差示扫描量热法和高温 X 射线粉末衍射研究的结果，并讨论了与化合物稳定性相关的结构参数。
• Single crystal growth and characterization of a new bismuth indium niobate compound, Bi5In2Nb3O18−x
  作者：Zhigang Zou、Jinhua Ye

  DOI：10.1016/s0925-8388(99)00214-5

  日期：1999.11

  Abstract Single crystals of a new bismuth indium niobate, Bi 5 In 2 Nb 3 O 18− x , were grown by subsolidus reaction method. Differential thermal analysis measurements indicate that the compound has a melting point of 1224°C. Single crystal and powder X-ray diffraction methods show that the compound has the tetragonal system; P4/mbm space group, and lattice constants are a =12.6548(5), and c =3.9231(3)

  摘要 采用亚固相反应法生长了一种新型铌酸铋铟单晶Bi 5 In 2 Nb 3 O 18- x 。差热分析测量表明该化合物的熔点为 1224°C。单晶和粉末X射线衍射方法表明该化合物具有四方晶系；P4/mbm 空间群，晶格常数 a =12.6548(5)，c =3.9231(3) A. 化合物 Bi 5 In 2 Nb 3 O 18− x 的磁化率表明居里-魏斯行为具有有效的磁性矩 μ eff =0.72(1) μ B