Scavenging Technique for Crystal Growth of Calcium Fluoride(<Special Issue>Crystal Growth Technology of Fluoride and Oxide Developed from the Viewpoint of Their Material and Functional Properties)

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  • フッ化カルシウム結晶育成におけるスカベンジング技術(<特集>材料物性から見たフッ化物・酸化物単結晶の育成技術)
  • フッ化カルシウム結晶育成におけるスカベンジング技術
  • フッカ カルシウム ケッショウ イクセイ ニ オケル スカベンジング ギジュツ

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Abstract

New scavenging method is designed to obtain calcium fluoride crystals which optical properties are excellent, eg. internal trans-mittance and laser durability. Reaction processes between scav-engers and raw material are examined by degas analyzing during heating. The results suggest the simple method that raw material with scavenger is heated in vacuum atmosphere is not enough to make scavenging process progress completely. Then, two steps are applied. The first step, scavenging reaction progess in inert gas atmosphere during the heating process. And the second step, degas of remained scavenger and reaction products progress in vacuum atmosphere. Using this method, optical properties of cal-cium fluoride crystals improved very much.

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