Structural Analysis of Al_2O_3 Based High Temperature Melts

含有Al_2O_3的熔体的结构信息对于更好地理解晶体的固熔反应和炼钢过程具有重要意义。然而，这些信息是不够的，因为在高温下的原位x射线衍射测量是非常困难的。本课题的主要目的是获得含Al_2O_3高温熔体的系统结构数据（Waseda et al ., 1994），在纯Al_2O_3结构数据的基础上，采用共角色散x射线衍射（ADXD）和能量色散x射线衍射（EDXD）技术对Al_2O_3- sio_2 - na_2o体系的熔体结构进行了系统分析。EDXD技术被认为是一种强大的技术，可以获得超过250nm^<-1>的宽干涉函数Qi(Q)，这使我们能够获得精确的径向分布函数（RDF）。实验rdf清楚地表明，随着SiO_2和Na_2O的加入，Al_2O_3熔体中AlO_6的局部结构单元转变为AlO_4的局部结构单元。这些有用的结果只能通过目前开发的ADXD和EDXD分析的结合来获得。目前的分析有望应用于更广泛的结构分析领域。

The structural information on the melt containing Al_2O_3 is important for the better understanding of solid-melt reactions of the crystal and steel making process. However, such information is not enough because in-situ X-ray diffraction measurement at high temperature is very difficult. The main purpose of the present research project is to obtain the systematic structural data of high temperature melts containing Al_2O_3Basing on the structural data of pure Al_2O_3 (Waseda et al, 1994), the melt structure in the Al_2O_3-SiO_2-Na_2O system was systematically analyzed by the common angular dispersive X-ray diffraction (ADXD) and the energy dispersive X-ray diffraction (EDXD) techniques. The EDXD technique is known to be one of the powerful techniques which allow to get wide interference function Qi(Q) of over 250nm^<-1> and this enables us to obtain precise radial distribution functions (RDF). The experimental RDFs clearly indicate that the local structural unit of AlO_6 in the Al_2O_3 melt changes into that of AlO_4 with the addition of SiO_2 and Na_2O.These useful results are obtained only by the combination of ADXD and EDXD analyzes, presently developed. The present analysis are expected to be applied to the wider field of structural analyzes.