水热条件下黄铁矿片、板状晶体的微结构

摘要

利用透射电子显微镜(TEM)系统观测了黄铁矿片、板状晶体的微结构,发现在水热条件下生成的黄铁矿片、板状晶体具有正方形、矩形等多种形貌.其中,正方形较多,矩形次之,另可见到一些其他不规则形状.黄铁矿片、板状晶生长完好,未见缺陷.经测定多数四边形片状黄铁矿的两组边分别平行(010)和(100),其生长晶面为(001);个别四边形片状黄铁矿的两组边分别平行(010)和(101),其生长晶面为(101),矩形片状黄铁矿长轴生长方向为＜001＞.在水热条件下黄铁矿以多形貌出现,黄铁矿的片、板状晶体多数是沿(001)面生长的结果,(001)为黄铁矿片、板状晶体的主要二维生长面,并沿＜001＞方向扩展,构成了二维晶体.%In this study we observe the microstructure of sheet and flake pyrite crystals systematically using the transmission electron microscope (TEM) and we discover that numerous pyrite morphologies such as square and rectangle etc can be formed under hydrothermal conditions. Pyrite sheet and flake crystals grow perfectly and have few internal defects. Our measurement indicates that most quadrilateral pyrite crystals have two sets of edges parallel to (010) and (100), and the growth crystal face is (001) ; and a few quadrilateral pyrite crystals have two sets of edges parallel to (010) and (101) , and the growth crystal face is (101). The long axis of rectangular flake crystals growth direction is <001>. We hold that pyrite crystals have multiple morphologies, most sheet and flake crystals grow along the two-dimensional growth plane (001), and extend along the <001> direction to constitute the two-dimensional crystals.