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Structural transformation on Se0.8Te0.2 chalcogenide glass

机译:Se0.8Te0.2硫族化物玻璃的结构转变

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摘要

Using X-ray diffraction and differential scanning calorimetry (DSC), the structure and the crystallization mechanism of Se0.8Te0.2 chalcogenide glass has been studied. The structure of the crystalline phase has been refined using the Rietveld technique. The crystal structure is hexagonal with lattice parameter a = 0.443 nm and c = 0.511 nm. The average crystallite size obtained using Scherrer equation is equal 16.2 nm, so it lies in the nano-range. From the radial distribution function, the short range order (SRO) of the amorphous phase has been discussed. The structure unit of the SRO is regular tetrahedron with (r(2)/r(1)) = 1.61. The Se0.8Te0.2 glassy sample obeys the chemical order network model, CONM. Some amorphous structural parameters have been deduced. The crystallization mechanism of the amorphous phase is one-dimensional growth. The calculated value of the glass transition activation energy (E-g) and the crystallization activation energy (E-c) are 159.8 +/- 0.3 and 104.3 +/- 0.51 kJ/mol, respectively. (C) 2008 Elsevier B.V. All rights reserved.
机译:利用X射线衍射和差示扫描量热法(DSC),研究了Se0.8Te0.2硫族化物玻璃的结构和晶化机理。结晶相的结构已使用Rietveld技术精制。晶体结构为六边形,晶格参数a = 0.443 nm,c = 0.511 nm。使用Scherrer方程获得的平均微晶尺寸等于16.2 nm,因此它位于纳米范围内。从径向分布函数,已经讨论了非晶相的短程有序(SRO)。 SRO的结构单元是规则四面体,(r(2)/ r(1))= 1.61。 Se0.8Te0.2玻璃态样品遵循化学有序网络模型CONM。推导了一些非晶结构参数。非晶相的结晶机理是一维生长。玻璃化转变活化能(E-g)和结晶活化能(E-c)的计算值分别为159.8 +/- 0.3和104.3 +/- 0.51kJ / mol。 (C)2008 Elsevier B.V.保留所有权利。

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