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首页> 外文期刊>RSC Advances >Structural and thermal properties of Na2Mn(SO4)(2)center dot 4H(2)O and Na2Ni(SO4)(2)center dot 10H(2)O
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Structural and thermal properties of Na2Mn(SO4)(2)center dot 4H(2)O and Na2Ni(SO4)(2)center dot 10H(2)O

机译：Na2Mn（SO4）（2）中心点4h（2）O和Na2Ni（SO4）（2）中心点10h（2）o的结构和热性质

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摘要

The title compounds were prepared via a wet chemistry route and their crystal structures were determined from single crystal X-ray diffraction data. Na2Mn(SO4)(2)center dot 4H(2)O crystallizes with a monoclinic symmetry, space group P2(1)/c, with a = 5.5415(2), b = 8.3447(3), c = 11.2281(3) angstrom, beta = 100.172(1)degrees, V = 511.05(3) angstrom(3) and Z = 2. Na2Ni(SO4)(2)center dot 10H(2)O also crystallizes with a monoclinic symmetry, space group P2(1)/c, with a = 12.5050(8), b = 6.4812(4), c = 10.0210(6) angstrom, beta = 106.138(2)degrees, V = 780.17(8) angstrom(3) and Z = 2. Na2Mn(SO4)(2)center dot 4H(2)O is a new member of the blodite family of compounds, whereas Na2Ni(SO4)(2)center dot 10H(2)O is isostructural with Na2Mg(SO4)(2)center dot 10H(2)O. The structure of Na2Mn(SO4)(2)center dot 4H(2)O is built up of [Mn(SO4)(2)(H2O)(4)](2-) building blocks connected through moderate O-HMIDLINE HORIZONTAL ELLIPSISO hydrogen bonds with the sodium atoms occupying the large tunnels along the a axis and the manganese atom lying on an inversion center, whereas the structure of Na2Ni(SO4)(2)center dot 10H(2)O is built up of [Ni(H2O)(6)](2+) and [Na-2(SO4)(2)(H2O)(4)](2-) layers. These layers which are parallel to the (100) plane are interconnected through moderate O-HMIDLINE HORIZONTAL ELLIPSISO hydrogen bonds. The thermal gravimetric- and the powder X-ray diffraction-analyzes showed that only the nickel phase was almost pure. At a temperature above 300 degrees C, all the water molecules evaporated and a structural phase transition from P2(1)/c-Na2Ni(SO4)(2)center dot 10H(2)O to C2/c-Na2Ni(SO4)(2) was observed. C2/c-Na2Ni(SO4)(2) is thermally more stable than Na2Fe(SO4)(2) and therefore it would be suitable as the positive electrode for sodium ion batteries if a stable electrolyte at high voltage is developed.
机译：通过湿化学途径制备标题化合物，并从单晶X射线衍射数据确定它们的晶体结构。 Na 2 Mn（SO4）（2）中心点4h（2）o用单斜晶体对称，空间组P2（1）/ c结晶，具有A = 5.5415（2），B = 8.3447（3），C = 11.2281（3） Angstrom，Beta = 100.172（1）度，V = 511.05（3）埃（3）和Z = 2. Na2NI（SO 4）（2）中心点10H（2）O也用单斜晶体对称，空间组P2结晶（ 1）/ c，带A = 12.5050（8），B = 6.4812（4），C = 10.0210（6）埃·agtrom，β= 106.138（2）度，v = 780.17（8）埃（3）和z = 2 。Na2Mn（SO4）（2）中心点4h（2）o是贝德岩家族的新成员，而Na2Ni（SO 4）（2）中心点10h（2）O是与Na2mg（SO4）的isostrontuctuctory（SO4）（2 ）中心点10h（2）o。 Na 2 Mn（SO4）（2）中心点4h（2）o的结构由[Mn（SO 4）（2）（2）（4）（4））]（2-）构建块连接，通过中等O-Hmidline水平椭圆iso连接氢键与钠原子沿着轴和躺在倒置中心的轴和锰原子占据大隧道，而Na2Ni（SO4）（2）中心点10h（2）o的结构是由[Ni（H2O ）（6）]（2+）和[Na-2（SO 4）（2）（2）（H 2 O）（4）层]（2-）层。与（100）平面平行的这些层通过中度O-Hmidline水平椭圆iso氢键互连。热重量和粉末X射线衍射分析表明，只有镍相几乎纯。在高于300摄氏度的温度下，蒸发所有水分子，并且从P2（1）/ C-Na 2 Ni（SO 4）（2）中心点10H（2）O至C2 / C-Na2Ni（SO 4）的结构相转变（ 2）被观察到。 C2 / C-Na2Ni（SO 4）（2）热比Na 2 Fe（SO 4）（2）热更稳定，因此如果高压下的稳定电解质，则适合作为钠离子电池的正极。

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  • 来源
    《RSC Advances》 |2020年第18期|共11页
  • 作者

    Ben Yahia Hamdi; Alkhateeb Alaa; Essehli Rachid;

  • 作者单位

    Hamad Bin Khalifa Univ Qatar Fdn Qatar Environm &

    Energy Res Inst QEERI 2 0 POB 34110 Doha Qatar;

    Hamad Bin Khalifa Univ Qatar Fdn Qatar Environm &

    Energy Res Inst QEERI 2 0 POB 34110 Doha Qatar;

    Oak Ridge Natl Lab Energy &

    Transportat Sci Div Oak Ridge TN USA;

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  • 正文语种 eng
  • 中图分类 化学;
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