含铀Srilankite的EBSD和SAED研究

以往人们发现的Srilankite中铀含量基本在0.2%以下,高铀含量的Srilankite的报道中也只有产状和化学组成方面的研究,而关于铀含量较高的含铀Srilankite结构方面的研究尚不曾报道。本文在前人研究的基础上,鉴于含铀Srilankite的小尺寸,故选用电子背散射衍射(EBSD)和选区电子衍射(SAED)方法对不同铀含量下的样品进行分析与探讨。结果表明,当UO 2含量在1.26%~9.20%时,即低铀-中铀含量时,Srilankite晶体结构并未随着铀原子的进入而发生显著改变;当UO 2含量在20.60%时,即处于高铀阶段时,矿物的晶体结构已发生蜕晶化。

EBSD and SAED study of the uranium-bearing Srilankite

In the past, the uranium content in discovered Srilankite was basically below 0.2%. Only studies on the occurrence and chemical composition of high uranium content Srilankite were reported, while studies on the structure of high uranium content uranium-bearing Srilankite were not reported. On the basis of previous studies, in view of the small size of uranium-bearing Srilankite, electron backscattering diffraction (EBSD) and selected area electron diffraction (SAED) methods were used to analyze and discuss samples with different uranium contents. The results showed that the crystal structure of Srilankite do did not change significantly with the entry of uranium atoms when the UO 2 content was 1.26%-9.20%, that is, when the uranium content was low -medium uranium content. When the UO 2 content was 20.60%, that is, at the stage of high uranium content, the crystal structure of this mineral has undergone amorphization.