iron tungstate

• 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: iron tungstate
• 英文别名: Iron;tungsten;tetrahydrate；iron;tungsten;tetrahydrate
• 化学式: FeO₄W
• 分子量: 303.695
• InChiKey: SCYJCUGQCCJYOJ-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  -3.3
• 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：
  4
• 氢给体数：
  4
• 氢受体数：
  4

反应信息

• 作为产物：
  描述：

  iron(II) oxide 、 tungsten(VI) oxide 以 neat (no solvent) 为溶剂， 生成 iron tungstate
  参考文献：
  名称：

  钨酸铁盐的制备及性能

  摘要：

  制备系统Fe 2- x Cr x WO 6和Fe 1- x Mn x WO 4的成员的多晶样品，并通过化学气相传输法生长Fe 1- x Mn x WO 4的单晶。表征了它们的晶体学参数和电性能。的Fe 2 WO 6结晶与三-α-PBO 2结构，并且是Ñ型半导体。为0.3≤ X ≤2，系统的Fe 2- X铬X WO6结晶具有反向三重结构，并且由于铁（II）-铁（III）的导电路径被铬（III）阻塞而不导电。为0≤ X ≤1，系统的Fe 1- X锰X WO 4个结晶与黑钨矿结构和示出了p型半导体的行为。Fe 1- x Mn x WO 4随x的电阻率变化的性质表明，在此结构中可能发生链间电子转移。

  DOI：

  10.1016/0022-4596(83)90029-4

文献信息

• FeWO₄ Single Crystals: Structure, Oxidation States, and Magnetic and Transport Properties
  作者：Antoine Maignan、Marcus Schmidt、Yurii Prots、Oleg I. Lebedev、Ramzy Daou、Chun-Fu Chang、Chang-Yang Kuo、Zhiwei Hu、Chien-Te Chen、Shih-Chang Weng、Simone G. Altendorf、Liu-Hao Tjeng、Yuri Grin

  DOI：10.1021/acs.chemmater.1c03640

  日期：2022.1.25

  Synthetic crystals of the ferberite FeWO4 have been grown by the chemical transport reaction starting from a polycrystalline sample of this phase. Magnetic susceptibility measurements showed an antiferromagnetic Néel temperature of TN = 75 K. The anisotropy in the magnetic susceptibility can be ascribed to the magnetocrystalline anisotropy of the Fe2+ ion, the oxidation state of which was confirmed

  铁素体FeWO 4的合成晶体已通过化学传输反应从该相的多晶样品开始生长。磁化率测量显示反铁磁Néel温度为T N = 75 K。磁化率的各向异性可归因于Fe 2+离子的磁晶各向异性，其氧化态由X射线吸收光谱证实。虽然 X 射线光发射分析表明所有 W 离子都处于预期的 6+ 电荷状态，但发现 FeWO 4晶体的介电常数存在泄漏，阻碍了T N处的变化被检测到。随后的热电功率测量表明存在约1.5％的Fe 3+。X 射线衍射实验证实了黑钨矿型的基本晶体结构，并揭示了 1% 范围内的一些结构紊乱。透射电子显微镜使我们能够揭示由于 Fe 和 W 物种的原子环境相似而导致的堆垛层错的发生。
• The catalytic performance of FexMn1-xWO4 as novel wolframite-type nanocatalysts for the selective dehydration of methanol into dimethyl ether
  作者：Mohamed Nady Goda、Mohamed Abd El-Aal、Esraa Magdy、Abd El-Aziz A. Said

  DOI：10.1016/j.mcat.2023.113350

  日期：2023.8

  Selective production of dimethyl ether (DME), as a second-generation biofuel, under mild green conditions is still a challenge. Herein, FexMn1-xWO4 wolframite-type materials were proposed for the first time as efficient, selective, and stable catalysts towards methanol dehydration into DME. A simple one-step co-precipitation approach was used to fabricate the nanocomposites, and their catalytic performances

  在温和的绿色条件下选择性生产二甲醚（DME）作为第二代生物燃料仍然是一个挑战。在此，首次提出Fe x Mn 1-x WO 4黑钨矿型材料作为甲醇脱水生成DME的高效、选择性和稳定的催化剂。使用一种简单的一步共沉淀方法来制造纳米复合材料，并与早期研究和商用γ-Al 2 O 3 的活性进行比较，评估其催化性能。通过XRD、XPS、FTIR、TEM和N 2吸附分析鉴定了催化剂的结构、形貌和孔隙率。XRD和XPS结果证实Fe的成功合成x Mn 1-x WO 4催化剂。这些纳米复合材料的酸度很大程度上受x值、煅烧温度和SO 4 2−掺杂的影响。通过PY-FTIR、碱性探针的化学吸附和吡啶-TPD研究了酸位的Brønsted特征及其弱和中等强度。这些纳米复合材料催化活性的变化与催化剂酸度的变化密切相关。催化活性结果表明，Fe 0.5 Mn 0.5 WO 4催化剂在500 ℃下煅烧并用5 wt.%的SO
• Iron-promoted phases in the tungsten-oxygen system
  作者：I.J. McColm、R. Steadman、S.J. Wilson

  DOI：10.1016/0022-4596(78)90051-8

  日期：1978.1

  An experimental survey of preparative work in the WO3Fe system in which temperatures up to 1100°C and pressures up to 55 kbar have been employed is presented. Two structures not usually found in the WO3 or FeWO3 system are encountered. Under the influence of high pressures the concentration of iron in an iron-tungsten bronze phase has been extended beyond the previously known limit of Fe0.02WO3 to

  的准备工作在WO实验调查3 Fe系统，其中，温度高达1100℃，提出C和压力高达已经采用千巴55。通常不会在WO发现了两个结构3或FeWO 3遇到系统。在高压的影响下，铁钨青铜相中的铁浓度已扩展到超出先前已知的Fe 0.02 WO 3极限，达到大约Fe 0.1 WO 3，其具有a = 7.422±0.003Å的六方结构，C＝ 3.766±0.002埃。在没有压力的情况下，但在1100°C长时间加热后，在有少量铁的情况下，接近W 5 O 14的成分产生的四方相a = 23.33±0.01Å，c = 3.797±0.001Å。如| 001 |中所示，给出了该相的单晶X射线结构分析的详细信息，表明该相包含五边形和六边形隧道并且与Mo 5 O 14等构。投影。该空间群被标识为不同于Mo 5 O 14的P 42 1 m 。W 5 O之间的区别观察到在不存在严重的起皱和z ＝ 12附近的金属原子更简单的排列的情况下存在图14和Mo
• Electronic structure of FeWO4 and CoWO4 tungstates: First-principles FP-LAPW calculations and X-ray spectroscopy studies
  作者：S. Rajagopal、V.L. Bekenev、D. Nataraj、D. Mangalaraj、O.Yu. Khyzhun

  DOI：10.1016/j.jallcom.2010.02.107

  日期：2010.4

  Total and partial densities of states of the constituent atoms of iron tungstate, FeWO4, and cobalt tungstate, CoWO4, have been calculated using the first-principles self-consistent full potential linearized augmented plane wave (FP-LAPW) method. The results obtained reveal that the O 2p-like states are the dominant contributors into the valence band of the tungstates under consideration, whilst the bottom of the conduction band of FeWO4 and CoWO4 is dominated by contributions of the empty Fe 3d- and Co 3d-like states, respectively. The FP-LAPW data indicate that the O 2p-like states contribute mainly into the top of the valence band, with also significant contributions throughout the whole valence-band region, of FeWO4 and CoWO4 compounds. Other significant contributors into the valence-band region are the Fe 3d- and W 5d-like states in FeWO4 and the Co 3d- and W 5d-like states in CoWO4. All the above d-like states contribute throughout the whole valence-band region of the tungstates under consideration, however maximum contributions of the W 5d-like states occur in the lower, whilst the Fe (Co) 3d-like states in the upper portions of the valence band, respectively. To verify the above FP-LAPW data, the X-ray emission bands representing the energy distributions of mainly the valence O p-, Fe (Co) d-, Fe (Co) p- and W d-like states were measured and compared on a common energy scale with the X-ray photoelectron valence-band spectrum of the corresponding tungstate. The experimental data were found to be in good agreement with the theoretical FP-LAPW results for the electronic structure of FeWO4 and CoWO4 compounds. (C) 2010 Elsevier B.V. All rights reserved.