Si production by direct electrolytic reduction of solid SiO2 in molten CaCl2

Kouji Yasuda, Toshiyuki Nohira, Koji Amezawa, Yukio H. Ogata, Yasuhiko Ito

研究成果: Conference contribution


Morphological and crystallographic investigations were conducted on the Si produced by direct electrolytic reduction of solid SiO2 in molten CaCl2 at 1123 K. From the results of SEM, it was proved that the produced Si had columnar shape. FE-SEM observation showed that the Si column had basically a hexagonal prismatic and stacking structure. The results of TEM and ED revealed that the Si column was a single crystal having {111} twin planes perpendicular to the major axis of the column. It is explained that amorphous Si is firstly formed by electrochemical reduction and then thermally transformed to crystalline Si. Purity of the Si was proved by EDX to be more than 99.9%. Current efficiency for the reduction of SiO2 to Si was calculated as 74% at 0.70 V.

ホスト出版物のタイトルMolten Salts XIV - Proceedings of the International Symposium
出版ステータスPublished - 2006 12 1
イベント206th ECS Meeting - Honolulu, HI, United States
継続期間: 2004 10 32004 10 8


名前Proceedings - Electrochemical Society
PV 2004-24


Other206th ECS Meeting
国/地域United States
CityHonolulu, HI

ASJC Scopus subject areas

  • 工学(全般)


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