Control of interface shape during the growth of transparent crystals by infrared convergent heating floating zone method and of the defects of the grown crystals

红外聚光加热浮区法生长透明晶体过程中界面形状及生长晶体缺陷的控制

• 批准号: 22K04696
• 负责人: 綿打 敏司
• 金额: $ 2.66万
• 依托单位: University of Yamanashi
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2022
• 资助国家: 日本
• 起止时间: 2022-04-01 至 2025-03-31
• 项目状态: 未结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-22K04696/
• 关键词: 結晶育成; 透明酸化物; 固液界面; 浮遊帯溶融法; 界面形状制御; 赤外線集中加熱

光学式加熱浮遊帯溶融法による透明酸化物結晶の高品質化に関わる研究を行ってきた．透明酸化物結晶育成時に見られる凹型の育成結晶と溶融帯との界面形状が育成結晶の結晶欠陥の要因となっていると推定し，その形状制御を集中加熱に用いる回転楕円面鏡の下方傾斜に行うことを目的に集中加熱炉の改造を実施した．2種類の透明酸化物Ca12Al14O33(以下C12A7)とLu3Al5O12(以下LuAG)を検討対象として界面形状と回転楕円面鏡の下方傾斜角との相関を調べた．その結果，C12A7では，凹型の界面形状を凸型に制御することで結晶育成の安定化に成功した．ただ，通常の原料棒配置で下方傾斜を行うと返って溶融帯中に大きな気泡が形成されやすくなり，溶融帯の保持が困難になった．原料棒の配置を工夫することで溶融帯中に生じる気泡を低減し，溶融帯を安定化させることができた．そのような原料棒の配置により，下方傾斜効果を再現性良く調べることが可能になり，通常の集中加熱条件では凹型となる溶融帯と育成結晶との界面形状が下方傾斜角度の変化に伴って系統的に凹型から凸型に変化することを明らかにした．一方，LuAGでは，凹型界面形状の系統的な変化が得られず，より注意深く検討する必要があることが解った．光の集中による加熱では，育成結晶の透明性や表面の平滑性により，集光する光の加熱される結晶や原料棒，溶融帯の表面における反射や透過状況が変化することに起因していると思われる．

The optical plus float melting method was used to study the high quality chemical properties of hyaluronic acids. during the formation of hyaluronic acid crystals, the critical temperature concave type of hyaluronic acid crystals was formed, the interface shape of crystal melting temperature was cultivated, and the defect of crystal was presumed due to the failure of temperature and temperature. In order to improve the shape of Ca12Al14O33 (below C12A7), Lu3Al5O12 (below LuAG), the shape of the interface is similar to that of the interface, the shape of the interface is similar to the shape of the interface, the shape of the interface is similar to that of the bevel below the surface, the bevel below the surface of the surface, the bevel below the surface, the bevel below the surface, the bevel of the bevel below the surface, and the results, the results are as follows: The shape of the interface is concave, the shape of the interface is convex, and the crystal results show that the stabilization is successful. Usually, under the configuration of the raw material rod, the inclined line is returned to form a large bubble in the melting process, and the melting temperature is maintained. The raw material rod is configured, and the bubble is low. The melting temperature is stable and stable. The raw material bar of the melting machine is configured with the device, and the lower part of the material bar is configured. It is possible to change the temperature of the lower part of the raw material bar. Usually, it is necessary to concentrate on the condition that the concave alloy is cured. The structure is formed by melting at an oblique angle below the interface shape, which is accompanied by the concave and convex shape of the system. On the other hand, the LuAG machine The shape of the concave interface is very sensitive to the transformation of the system, so pay attention to the fact that it is necessary to solve the problem. The light is concentrated on the surface of the crystal, the transparency of the crystal, the smoothness of the surface, the raw material of the crystal, the reflection of the surface, and the cause of the crystal.