榍石固溶体中钕的固溶量

Solid-Soluted Content of Neodymium in Solid Solution of Sphene

摘要: 以CaCO₃、H₂SiO₃、TiO₂、Nd₂O₃和Al₂O₃为原料，通过高温固相反应合成榍石固溶体，借助X射线衍射（XRD）、扫描电子显微镜（SEM）、能谱仪（EDS）等分析手段，研究钕在榍石固溶体中的固溶情况。结果表明，引入Al³⁺作为电价补偿时，Nd³⁺能较好地固溶在Ca_1-yNd_yTi_1-yAlySiO₅固溶体中，其固溶量为12.3%～13.56%；不引入电价补偿时，Nd较难在Ca缺位的Ca_1-3/2yNd_yTiSiO₅固溶体中固溶，其固溶量约为3.5%；合成掺Nd榍石固溶体的较佳温度为1 270 ℃。

Abstract: The solid-state reaction synthesis of sphene were studied by using CaCO₃, TiO₂, H₂SiO₃, Nd₂O₃ and Al₂O₃ as raw materials to prepare of sphene synroc, and by means of XRD, EDS and SEM analysis as well. The influence of Al³⁺ ion introduction to sphene on the immobilization quantity of neodymium in sphene synroc was studied. When Al3+ was introduced to sphene as compensation of electricity price, Nd³⁺ could be well solidified to Ca₁-_yNd_yTi_1-yAl_ySiO₅. The immobilization quantity is in the range of 12.3%-13.56%. With no compensation of electricity price, Nd³⁺ would be more difficulty to be solidified to Ca_1-3/2yNd_yTiSiO₅. The immobilization quantity is approximately 3.5%. The appropriate synthesis temperature of sphene solid solution is 1 270 ℃.