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tantalum(V) oxide

中文名称
——
中文别名
——
英文名称
tantalum(V) oxide
英文别名
tantalum oxide;tantalum pentoxide;tantalum pentaoxide;Tantalum;pentahydrate;tantalum;pentahydrate
tantalum(V) oxide化学式
CAS
——
化学式
O5Ta2
mdl
——
分子量
441.893
InChiKey
HLELEJKAYXHBMH-UHFFFAOYSA-N
BEILSTEIN
——
EINECS
——
  • 物化性质
  • 计算性质
  • ADMET
  • 安全信息
  • SDS
  • 制备方法与用途
  • 上下游信息
  • 反应信息
  • 文献信息
  • 表征谱图
  • 同类化合物
  • 相关功能分类
  • 相关结构分类

计算性质

  • 辛醇/水分配系数(LogP):
    -4.13
  • 重原子数:
    7
  • 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:
    tantalum(V) oxide 在 charcoal 、 Cl2 作用下, 生成 五氯化钽
    参考文献:
    名称:
    Gmelin Handbuch der Anorganischen Chemie, Gmelin Handbook: Ta: MVol.B1, 3.2, page 30 - 61
    摘要:
    DOI:
  • 作为产物:
    描述:
    五氯化钽盐酸air 作用下, 以 neat (no solvent) 为溶剂, 生成 tantalum(V) oxide
    参考文献:
    名称:
    氮化-热分解法合成纳米晶立方钽(III)氮化物粉末
    摘要:
    通过在氨流下在 800°C 下将纳米级 Ta2O5 氮化 8 小时制备的氮化钽 (V) 在氩气气氛下在 1000°C 下热分解为立方纳米晶 TaN 3 小时。所得粉末已使用 X 射线衍射 (XRD) 和透射电子显微镜进行表征。通过该工艺可以获得直径为 50-100 nm 的 XRD 纯立方氮化钽纳米颗粒。发现分解过程取决于温度。讨论了解释钽 (V) 氮化物分解的机制。结果表明,该方法可以在环境压力和中等温度下形成立方相氮化钽 (III)。
    DOI:
    10.1111/j.1551-2916.2005.00617.x
  • 作为试剂:
    描述:
    参考文献:
    名称:
    Process for making acrylonitriles
    摘要:
    公开号:
    US02562583A1
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文献信息

  • Thermochemistry of cation disordered Li ion battery cathode materials, (M′ = Nb and Ta, M′′ = Mn and Fe)
    作者:Tamilarasan Subramani、Alexandra Navrotsky
    DOI:10.1039/c9ra09759g
    日期:——
    High temperature oxide melt solution calorimetry studies on (M′ = Nb5+, M′′ = Mn3+ and Fe3+ and x = 0.20, 0.30 and 0.40) oxides and a new family of Ta containing Li excess disordered cathode materials, (M′ = Ta5+, M′′ = Fe3+ and x = 0.20, 0.30 and 0.40), synthesized by a rapid quenching method, are reported in this study. The enthalpies of formation determined from high temperature calorimetry studies
    (M' = Nb 5+ , M'' = Mn 3+ and Fe 3+ and x = 0.20, 0.30 and 0.40)氧化物和新的Ta族含Li过量无序正极材料的高温氧化物熔体溶液量热研究,本研究报道了采用快速淬火法合成的(M′ = Ta 5+,M′′ = Fe 3+和x = 0.20、0.30和0.40)。由高温量热法研究确定的生成焓表明,化合物的稳定性随着每个分子式单元中含量的增加而增加。更碱性的Li 2之间的反应O 和酸性过渡金属氧化物导致这些化合物的生成焓更负。该工作表明,形成焓项在室温下稳定这种无序离子材料中起更重要的作用,而构型熵以及晶格熵(振动和磁性)有助于样品在高温下淬火的稳定性.
  • A new preparation strategy via an in situ catalytic process: CeO<sub>2</sub>@Ag/Ag<sub>2</sub>Ta<sub>4</sub>O<sub>11</sub>catalyst for 4-nitrophenol reduction
    作者:Yuhang Wu、Congyan Li、Kaiwen Zhou、Yanhong Zhao、Xiaojing Wang
    DOI:10.1039/c6ce01171c
    日期:——
    A novel catalyst, CeO2@Ag/Ag2Ta4O11, was successfully assembled via an in situ catalytic process for 4-nitrophenol reduction. As-prepared samples were characterized using high-resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), X-ray spectroscopy (XPS), and ultraviolet-visible diffuse reflection spectroscopy (DRS). The results showed the elementary substance Ag was produced from Ag2Ta4O11 after a circular reduction reaction and was homogeneously deposited on the surface of Ag2Ta4O11 nanoparticles, which were wrapped by octahedron-shaped CeO2. The as-prepared nanocomposites exhibited extremely accelerated catalytic activity toward the efficient reduction of 4-nitrophenol compared to pure CeO2 and Ag2Ta4O11 nanoparticles. 15 rounds of recycling experiments confirmed that the samples exhibited good reuse stability, assigned to the confined robust shield of CeO2. The shell of CeO2 efficiently prevented undesirable aggregation and leaching of Ag nanoparticles. The persistent ascending activity with an increasing number of experimental runs was related to the amount of metallic Ag gradually growing. Moreover, it was proposed that the active interfacial contact between ceria oxide/metallic Ag/the semiconductor Ag2Ta4O11 (CeO2@Ag/Ag2Ta4O11) in the core–shell structure facilitated the transfer of electrons, contributing to the enhanced activity.
    一种新型催化剂CeO2@Ag/Ag2Ta4O11通过原位催化过程成功组装用于4-硝基苯还原。通过高分辨透射电子显微镜(HRTEM)、X射线衍射(XRD)、X射线能谱(XPS)和紫外-可见漫反射光谱(DRS)对制备的样品进行了表征。结果表明,经过循环还原反应后,Ag2Ta4O11产生了单质Ag,并在Ag2Ta4O11纳米粒子表面均匀沉积,这些纳米粒子被八面体形状的 包裹。与纯 和Ag2Ta4O11纳米粒子相比,制备的纳米复合材料对4-硝基苯的高效还原表现出极快的催化活性。15轮循环实验证实样品具有良好的重复使用稳定性,归因于 的限制性坚固屏蔽作用。 壳有效地防止了Ag纳米颗粒的不良聚集和浸出。随着实验次数的增加,持续上升的活性与属Ag逐渐增长的量有关。此外,提出 @Ag/Ag2Ta4O11核壳结构中氧化铈/属Ag/半导体Ag2Ta4O11之间活性界面接触促进了电子传递,有助于提高活性。
  • Characterization of multiferroic PbFe<sub>0.5</sub> Nb<sub>0.5</sub> O<sub>3</sub> and PbFe<sub>0.5</sub> Ta<sub>0.5</sub> O<sub>3</sub> ceramics derived from citrate polymeric precursors
    作者:Irena Gruszka、Antoni Kania、Ewa Talik、Magdalena Szubka、Seweryn Miga、Joanna Klimontko、Jan Suchanicz
    DOI:10.1111/jace.15998
    日期:2019.3
    Ceramics of the perovskite multiferroics PbFe0.5Nb0.5O3 (PFN) and PbFe0.5Ta0.5O3 (PFT) were synthesized from new citrate polymeric precursors. X‐ray tests pointed to trace amounts of the pyrochlore phase. SEM studies revealed the heterogeneous grain size distribution for PFN and the homogeneous one for PFT. Dielectric studies pointed to one diffuse T‐C phase transition at 378 K for PFN and two diffuse
    由新型柠檬酸盐聚合物前驱体合成了矿多化合物PbFe 0.5 Nb 0.5 O 3(PFN)和PbFe 0.5 Ta 0.5 O 3(PFT)的陶瓷。X射线测试指出了痕量的烧绿石相。SEM研究表明,PFN的晶粒尺寸分布不均匀,PFT的晶粒尺寸分布均匀。介电研究指出,PFN在378 K处发生一个扩散T-C相变,PFT分别在200和235 K处发生两个扩散M-T和T-C相变。PFN的X射线光电子能谱研究表明,所有离子均以一种价态存在,但是Pb 2+具有两个化学位移。大多数PFT离子的两个价态似乎与无定形晶界相的较高体积分数有关。两种化合物的电子能带隙约为2.8 eV。对于PFN,分别在156和10 K处以及在PFT在145和15 K处,观察到两个磁跃迁,即从顺磁性到反磁相,然后到自旋玻璃相。
  • Tantalum and niobium powder preparation from their oxides by calciothermic reduction in the molten CaCl2
    作者:Masahiko Baba、Youhei Ono、Ryosuke O. Suzuki
    DOI:10.1016/j.jpcs.2004.06.042
    日期:2005.2
    Abstract Calciothermic reductions of Ta 2 O 5 and Nb 2 O 5 are proposed aiming at the fine powder preparation for the larger capacitance of condensers. Because the molten CaCl 2 can coexist stably with metallic Ca, and because it can dissolve a few mol%Ca and about 20 mol%CaO, the reductant Ca can be supplied to the oxide via molten CaCl 2 , and the reaction by-product CaO can be in situ eliminated
    摘要 针对电容器较大电容的细粉制备,提出了Ta 2 O 5 和Nb 2 O 5 的热还原。因为熔融的CaCl 2 可以与属Ca稳定共存,又可以溶解少量mol%Ca和约20mol%CaO,还原剂Ca可以通过熔融CaCl 2 供给氧​​化物,反应副产物CaO可以从反应界面原位消除。在 1173 K 下经过 1 小时后获得属粉末。随着时间的推移,颗粒烧结在一起,但氧逐渐去除到几千 ppm 的平。
  • Peroxotantalate-Based Ionic Liquid Catalyzed Epoxidation of Allylic Alcohols with Hydrogen Peroxide
    作者:Wenbao Ma、Chen Chen、Kang Kong、Qifeng Dong、Kun Li、Mingming Yuan、Difan Li、Zhenshan Hou
    DOI:10.1002/chem.201605661
    日期:2017.5.29
    in the epoxidation of various allylic alcohols under very mild conditions by using only one equivalent of hydrogen peroxide as an oxidant. NMR studies showed the reaction was facilitated through a hydrogen‐bonding mechanism, in which the peroxo group (O–O) of the peroxotantalate anion served as the hydrogen‐bond acceptor and hydroxyl group in the allylic alcohols served as the hydrogen‐bond donor. This
    烯丙基醇的有效和对环境无害的环氧化已经实现通过使用单体peroxoTAnTAlate的新种阴离子官能的离子液体离子液体= [P 4,4,4,Ñ ] 3 [TA(O)3(η-O 2) ],P 4,4,4,n =季phospho阳离子,n = 4、8和14),它们已经被开发并相应地确定了它们的结构。这项工作揭示了IL的母体阴离子在H 2 O 2存在下经历了结构转变。形成的活性物质表现出优异的催化活性,[P 4,4,4,4 ] 3 [TA(O)的转换频率3(η-O 2)高达285 H的] -1通过仅使用一当量的过氧化氢作为氧化剂的,和满意的可回收各种烯丙基醇的非常温和的条件下环氧化。NMR研究表明,该反应是通过氢键机制促进的,其中过氧酸根阴离子的过氧基团(O-O)充当氢键受体,而烯丙基醇中的羟基充当氢键供体。这项工作表明简单的单体过氧酸酯可以有效地催化烯丙基醇的环氧化。
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