Synthesis of High-Purity Zirconium Fluoride for Fluoride Glass Fibers by Chemical Vapor Deposition |
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Authors: | Kazuo Fujiura Yasutake Ohishi Shigeki Sakaguchi Yukio Terunuma |
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Affiliation: | Opto-Electronics Laboratories, Nippon Telegraph and Telephone Corporation, Tokai, Ibaraki 319–11, Japan |
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Abstract: | A technique for synthesizing ultra-high-purity ZrF4 using chemical vapor deposition in a ZrBr4–HF system is developed and a purification mechanism is clarified. The Fe concentration in ZrF4 is evaluated at less than 10 ppb based on analysis of the transmission loss spectrum of a fiber prepared using synthesized ZrF4. Purification is achieved mainly in a sublimation process of ZrBr4, and purification efficiency is determined by sublimation temperature and activity of impurities in ZrBr4. The concentration of transition-metal impurities in ZrF4, synthesized by chemical vapor deposition in the ZrBr4–HF system, is expected to be less than 1 ppb. |
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Keywords: | glass fluorine chemical vapor deposition synthesis zirconium |
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