MgAl₂O₄–Ln₂Sn₂O₇ (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 °C in air for 24 h leads to the formation of Ln₂Sn₂O₇ 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 μm for both phases. HRTEM and SAED observations confirm that both phases possess a high level of crystallographic perfection at the atomic scale.

已使用软化学方法合成了具有50-70％（体积）MgAl ₂ O ₄作为潜在惰性基质燃料的MgAl ₂ O ₄ –Ln ₂ Sn ₂ O ₇（Ln = Y，La，Nd，Gd和Tb）复合材料。X射线衍射（XRD），拉曼光谱，扫描和透射电子显微镜（SEM / TEM）用于研究两种陶瓷相的体积和微观结构。在空气中于1400°C热处理24小时导致形成Ln ₂ Sn ₂ O ₇烧绿石和MgAl ₂ O ₄尖晶石通过XRD，拉曼和选定区域电子衍射（SAED）确认。更重要的是，一个相中的组分不会影响另一相的晶体形成。热分析结果显示的MgAl ₂ ö ₄结晶之前是Y的₂的Sn ₂ ö ₇和Y的结晶₂的Sn _2个ö ₇延误，由于镁铝存在₂ Ò ₄。扫描电镜显示在尖晶石基体中烧绿石颗粒均匀分布，特别是对于等体积比的样品，两相的晶粒尺寸均为1-5μm。HRTEM和SAED的观察结果证实，这两个相在原子尺度上均具有高水平的晶体学完善性。