著者
大石 修治 望月 圭介 平野 眞一
出版者
公益社団法人日本セラミックス協会
雑誌
日本セラミックス協会学術論文誌 : Nippon Seramikkusu Kyokai gakujutsu ronbunshi (ISSN:18821022)
巻号頁・発行日
vol.102, no.1185, pp.502-504, 1994-05-01
被引用文献数
3 6

The growih of emerald crystals by the flux evaporation method in the system Mo0_3 B_20_3 rs reported. The crys tal growth was conducted by heating a mixture of a so lute (3BeO・Al_2O_3・6SiO_2+1wt% Cr_2O_3) and a fiux (MoO_3 B_2O_3) at 1100℃, followed by holding at 1100℃ for 10, 20, 25 and 30h. The evaporation loss of flux decreased gradually with increasing amount of B_20_3 ad ded to Mo0_3 and increased with the holding time. The transparent emerald crystals were grown with the typi cal emerald green color in size up to I mm. The crystal size was dependent on the evaporation loss of flux. Hexagonal thin plate like crystals were grown from an Mo0_3 rich flux containing 0.15 0.60 wt% B_20_3. The plate like crystals were bounded by the {0001} and {1010} faces. In rare cases, the small {1120} faces ap peared. Crystals grown froun the MoO_3 flux were twelve sided prism in shape. Molybdenum trioxide con taining a small amount of B_2O_3 was found to be a suita ble flux for growing plate like crystals of emerald.
著者
手嶋 勝弥 近藤 人資 鈴木 孝臣 大石 修治
出版者
公益社団法人 日本セラミックス協会
雑誌
Journal of the Ceramic Society of Japan (日本セラミックス協会学術論文誌) (ISSN:09145400)
巻号頁・発行日
vol.113, no.1323, pp.733-735, 2005 (Released:2005-11-01)
参考文献数
17
被引用文献数
1 6

Large ruby crystals, exhibiting the typical transparent-red color, have been successfully synthesized by the evaporation of molybdenum trioxide flux. The grown crystals were up to 3.1×3.0 mm in size. In the case of 99 mass% of flux evaporation, the crystal sizes were dependent on the mixture (solute+flux) amounts. A sixfold increase in the mixture amount (30 to 180 g) resulted in double or higher increase in the average sizes (1.2×1.0 mm to 2.5×2.2 mm). The basic form of the grown crystals was a hexagonal bipyramid which consists of twelve well-developed {1123} faces. Furthermore, {0001} faces were also observed in large crystals, besides {1123} faces.
著者
手嶋 勝弥 是津 信行 石崎 貴裕 我田 元 大石 修治
出版者
信州大学
雑誌
基盤研究(A)
巻号頁・発行日
2013-04-01

研究代表者のオリジナル技術である『フラックスコーティング法』の基盤構築をめざし,単結晶薄膜の創成と応用に関するプロセスイノベーションに注力した。特に,フラックスコーティング技術を実現するスマートフラックス概念の確立,単結晶超薄膜(結晶層)のビルドアップ&オンデマンド成長モデルの解明,ならびに次世代グリーン&バイオイノベーションに資する単結晶超薄膜応用を中心課題とし,すべての課題に独自の解を提案した。これまでの経験と知見にもとづくフラックスプロセスに,計算科学の視点を新しく導入し,学理の体系化の端緒を踏み出すことに成功した。また,フラックス単結晶薄膜の特長を活かしたデバイス提案も実現した。