首页> 外文期刊>Journal of Nuclear Materials: Materials Aspects of Fission and Fusion >One-pot synthesis of Ln(2)Sn(2)O(7) pyrochlore and MgAl2O4 spinel by soft chemistry route as potential inert matrix fuel system, and the microstructural analysis
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One-pot synthesis of Ln(2)Sn(2)O(7) pyrochlore and MgAl2O4 spinel by soft chemistry route as potential inert matrix fuel system, and the microstructural analysis

机译:通过软化化学路线作为潜在的惰性基质燃料系统,单罐合成LN(2)Sn(2)O(2)O(2)O(2)O(7)型晶晶晶晶型,以及微观结构分析

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摘要

MgAl2O4-Ln(2)Sn(2)O(7) ( Ln = Y, La, Nd, Gd and Tb) composite materials with 50-70 vol% of MgAl2O4 as potential inert matrix fuels have been synthesized using a soft chemistry route. X-ray diffraction (XRD), Raman, scanning and transmission electron microscopies (SEM/TEM) are employed to investigate the bulk and micro structures of both ceramic phases. Heat treatment at 1400 degrees C in air for 24 h leads to the formation of Ln(2)Sn(2)O(7) pyrochlore and MgAl2O4 spinel which are confirmed by XRD, Raman and selected area electron diffraction (SAED). More importantly, the component in one phase does not affect the crystalline formation of the other. Thermal analysis results show MgAl2O4 crystallizes prior to that of Y2Sn2O7 and the crystallization of Y2Sn2O7 delays due to the presence of MgAl2O4. SEM shows uniformly distributed pyrochlore particles in spinel matrix, especially for the sample in equal volume ratio, with grain sizes being 1-5 mm for both phases. HRTEM and SAED observations confirm that both phases possess a high level of crystallographic perfection at the atomic scale. Crown Copyright (C) 2020 Published by Elsevier B.V. All rights reserved.
机译:MgAl2O4-LN(2)Sn(2)O(7)(LN = Y,La,Nd,Gd和Tb)复合材料,其具有50-70体积%的MgAl2O4作为潜在的惰性基质燃料,使用软化学路线合成。使用X射线衍射(XRD),拉曼,扫描和透射电子显微镜(SEM / TEM)来研究陶瓷阶段的体积和微结构。在1400℃的空气中在24小时内进行热处理导致LN(2)Sn(2)O(7)型纤维素和MgAl2O4尖晶石的形成,所述XRD,拉曼和所选区域电子衍射(SAED)确认。更重要的是,一个相中的组分不会影响另一个阶段的结晶形成。热分析结果显示MgAl2O4在Y2SN2O7之前结晶,并且由于MgAl2O4的存在而结晶Y2SN2O7延迟。 SEM在尖晶石基质中显示出均匀分布的纤维粒子,特别是对于等于体积比的样品,两个相对于晶粒尺寸为1-5mm。 HRTEM和SAED观察结果证实,两阶段都具有原子尺度的高水平晶体完美。皇家版权(c)2020由elestvier b.v发布。保留所有权利。

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