Cation and Anion Distributions in Minerals

本研究是对矿物中正离子和阴离子分布的实验和理论研究。阳离子分布的实验研究将主要使用电子通道（ALCHEMI）方法，并使用x射线和中子衍射进行辅助研究。阳离子研究有两个主要目的。首先是通过比较在许多相上的通道实验结果和用其他成熟的方法在相同样品上确定的占位率，对ALCHEMI中的误差进行详细的评估。第二个目标是利用该方法的一些独特优势，对若干地质和地球物理上重要的矿物的场地占用率和场地偏好进行定性和半定量确定。

This study is an experimental and theoretical investigation of cation and anion distributions in minerals. Experimental study of cation distributions will primarily use the method of electron-channeling (ALCHEMI) with supporting studies using x-ray and neutron diffraction. There are two main objectives of the cation studies. The first is to make a detailed assessment of the errors in ALCHEMI by comparing results of channeling experiments on a number of phases with occupancies determined on the same samples by other well-established methods. The second objective is to exploit some of the unique advantages of the method in conducting qualitative and semi-quantitative determinations of site occupancies and site preferences in a number of geologically and geophysically significant minerals.