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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >The hydrothermal synthesis, crystal structure and electrochemical properties of MnSb2O4
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The hydrothermal synthesis, crystal structure and electrochemical properties of MnSb2O4

机译:MnSb2O4的水热合成,晶体结构和电化学性能

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Phase pure polycrystalline MnSb2O4 was synthesised under hydrothermal conditions. Impurities formed outside a narrow range of pH and metal stoichiometric ratios. The structure and its temperature dependence was studied based on multi -temperature conventional single crystal X-ray diffraction (SC-XRD) and high resolution synchrotron powder X-ray diffraction (PXRD). At low temperature (100-300 K) the lattice parameters expanded linearly with thermal expansion coefficients of aa,300 K 8(1) x 10(-6) K-1 and alpha c,300 K = 7.2(2) x 10(-6) K-1. At high temperature an irreversible annealing effect was observed. Modelling the atomic displacement parameters based on the single crystal X-ray diffraction data gives a Debye temperature of 267(3) K for MnSb2O4. When heated in an oxygen -rich atmosphere MnSb2O4 oxidises above 800 K and it decomposes at 975 K under inert conditions. Electrochemical measurements displayed similar behaviour to the isostructural CoSb2O4, with reversible alloying-dealloying of Li,Sb after the first cycle with a reversible capacity of 337 mAh g(-1) at the 2(nd) cycle, which degraded to c. 100 mAh g(-1) after 30 cycles.
机译:在水热条件下合成了相纯多晶MnSb2O4。在pH和金属化学计量比的狭窄范围之外形成杂质。基于多温度常规单晶X射线衍射(SC-XRD)和高分辨率同步加速器粉末X射线衍射(PXRD)研究了结构及其温度依赖性。在低温(100-300 K)下,晶格参数以热膨胀系数aa,300 K 8(1)x 10(-6)K-1和alpha c,300 K = 7.2(2)x 10( -6)K-1。在高温下,观察到不可逆的退火作用。基于单晶X射线衍射数据对原子位移参数进行建模,得出MnSb2O4的德拜温度为267(3)K。在富氧气氛中加热时,MnSb2O4在800 K以上氧化,并在惰性条件下在975 K分解。电化学测量显示出与同构CoSb2O4相似的行为,在第一个循环后,Li,Sb的可逆合金脱合金,在第二个循环中可逆容量为337 mAh g(-1),降级为c。 30个循环后100 mAh g(-1)。

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