Bi4Si3O(12)晶列结构中的晶粒变化趋势和相关性分析

Analysis of Grain Size Trends and Correlativity in Bi_4Si_3O_(12) Grain Line Structure

在常压下用烧结法制备了具有高有序晶列结构的Bi4Si3O12微晶。利用X射线衍射(X-ray diffraction,XRD)和环境扫描电镜(Environmental Scanning Electron Microscopy,ESEM)分析了生成晶体的物相和微观形貌。结果表明:生成的是纯的立方相Bi4Si3O12晶体。Bi4Si3O12晶粒总是成对分布,且排列成行,从而形成高有序的晶列结构。其晶粒尺寸变化趋势有两种,一种是逐渐增大或者减小,另一种是晶粒尺寸在某一区域值内基本保持不变。在大多数情况下,每个晶行两侧的晶粒变化趋势具有一致性,每行两侧的晶粒尺寸具有高度的正相关特性。如果某行两侧的晶粒尺寸变化趋势不一致,而且晶粒尺寸不相关,则该行两侧晶粒应该属于两种不同的变化趋势。

Highly ordered bismuth silicate micro-crystals have been grown by sintering method under atmosphere pressure. The samples were characterized for structural and surface morphological properties by X-ray diffraction （XRD） and Environmental scanning electron microscopy （ESEM）. The result showed that pure cubic phase （Bi4Si3O12） was obtained. The Bi4Si3O12 grains always distribute in pairs on both sides and arrange grain lines. There are two types of grain size trend along with the growth direction of the grain line. One trend is gradually increased or decreased and the other trend is basically unchanged. In most case, the grain size trends on both sides of one line are approximately consistent and there is a highly positive correlation of the grain sizes on both sideg of one line. If the grain size trends on both sides are thoroughly inconsistent and there is a nonlinear relationship of grain sizes on both sides in one line, these two trends maybe belong to two types respectively.