Crystallized structures of amorphous oxides

非晶氧化物的结晶结构

• 批准号: 63550531
• 负责人: ITO Kunio
• 金额: $ 1.09万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1988
• 资助国家: 日本
• 起止时间: 1988 至 1989
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-63550531/
• 关键词: Amorphous oxide; Glass; Crystallization; Preferred orientation; Spheroidal crystal; 優先方位; 非晶質材料; 酸化物; セラミックス; 結晶成長

Structure and crystallographic texture of Li2O-B203 crystallized under temperature gradients have been examined. 1) Specimens of 23-27mol%Li20 - 73-77Mol%B203 were heated in a Pt-10%Rh crucible for 1h at 873k and for 1h at 1273, and poured into a die with 15mm diameter and 3mm depth of cast iron and pressed with a plate of the same material. 2) The specimens were set on a stainless steel block heated at constant temperatures so that they might be crystallized under temperature gradients of about 5OK/mm. The temperatures of the block were controlled between 823K and 913K. 3) The crystallization begins on the surface in contact with the block. Spheroidal crystals with 0.1 - 5mm diameter grow into the matrix. They are composed of fibers. Four phases Li202B203, 2Li205B203, Li204B203-1, and Li204B203-I, are found in the layer near the surface, but only Li202B203 and Li204B203-I are present in the deeper layers. 4) Fiber-like crystallines of Li202B203 in the spheroidal crystals show preferred orientation. The indices are still not determined.

已经检查了在温度梯度下结晶的LI2O-B203的结构和晶体学纹理。 1）23-27mol％li20-73-77mol％B203的标本在873K时为1H，在1H中加热1H，在1273时为1H，并倒入15mm直径和3mm的铸铁深度，并用相同材料的盘子压成3毫米。 2）将样品设置在在恒定温度下加热的不锈钢块上，以便在约5OK/mm的温度梯度下结晶。该块的温度在823K和913K之间控制。 3）结晶始于与块接触的表面。直径为0.1-5mm的球体晶体生长到基质中。它们由纤维组成。在表面附近的层中发现了四个阶段LI202B203、2LI205B203，LI204B203-1和LI204B203-I，但只有Li202b203和Li204B203-I在较深的层中存在。 4）球体晶体中Li202b203的纤维状晶体显示优选方向。这些指数仍未确定。