THE CONVECTIVE EFFECT ON THE MORPHOLOGICAL INSTABILITY OF KNbO3 CRYSTALS

摘要：

@@ Experimentally, it was observed that there were various morphologies of KNbO3 crystals in different regions of the melt of Li2B4O7 and KNbO3 mixture in Pt loop heater. Dendrites grew in the central area of the melt, the diffusive-advective region,in which the temperature gradient is negligible; whereas crystals with smooth sur face were observed in the marginal area, the diffusive-convective region, with large temperature gradient. Based on the solute concentration over the KNbO3 crystal surface examined by electronic probe analysis, it was proved that the combinative effect of buoyancy and surface tension convection induced by temperature gradient enhanced the homogeneity of the solute concentration around KNbO3 crystals and thus their morphological stability.

机标关键词：temperature gradient、surface tension

所属期刊栏目：22

分类号：O6(化学)

在线出版日期：2004-01-08（万方平台首次上网日期，不代表论文的发表时间）

页数：共1页

页码：161-161