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.

研究了温度梯度下结晶Li2O-B203的结构和晶体织构。1) 23-27mol%Li20 - 73-77Mol%B203试样在Pt-10%Rh坩埚中873k加热1h， 1273加热1h，倒入直径15mm，深3mm的铸铁模具中，用相同材料的板压制。2)将试样置于恒温加热的不锈钢块上，使试样在约5OK/mm的温度梯度下结晶。块体的温度控制在823K到913K之间。3)与块体接触的表面开始结晶。直径为0.1 ~ 5mm的球形晶体在基体中生长。它们是由纤维组成的。近表层中存在Li202B203、2Li205B203、Li204B203-1和Li204B203-I四相，深层中只存在Li202B203和Li204B203-I相。4) Li202B203的纤维状晶体在球状晶体中表现出优先取向。指数仍未确定。