Electron backscatter diffraction of BaAl2B2O7 crystals grown from the surface of a BaO·Al2O3·B2O3 glass
Electron backscatter diffraction of BaAl2B2O7 crystals grown from the surface of a BaO·Al2O3·B2O3 glass
复制标题
BaO·Al2O3·B2O3 玻璃表面生长的 BaAl2B2O7 晶体的电子背散射衍射
作者：
W. Wisniewski;Tilman Zscheckel;G. Völksch;C. Rüssel
在780 °C下对组成为BaO·Al2O2·B2O3的玻璃退火8 h。用电子背散射衍射（EBSD）对样品进行了分析。在样品的表面处，形成由BaAl2B2O7晶体组成的第一层，所述BaAl2B2O7晶体的晶体学c轴垂直于表面取向。这一层是高度定向的，厚度可达20 µm。在随后的层中，晶体以其晶体学c轴平行于表面取向。虽然第一层是由在表面处的定向成核引起的，但第二层的取向是由球晶生长的晶体的动力学选择引起的。
A glass with the composition BaO·Al2O2·B2O3 was annealed at 780 °C for 8 h. The samples were investigated by electron backscatter diffraction (EBSD). At the surface of the samples a first layer composed of BaAl2B2O7 crystals oriented with their crystallographic c-axes perpendicular to the surface was formed. This layer was highly oriented and up to 20 µm thick. In a subsequent layer, the crystals were oriented with their crystallographic c-axes parallel to the surface. While the first layer was caused by oriented nucleation at the surface, the orientation of the secondary layer was caused by kinetic selection of spherulitically grown crystals.