Preparation of high-purity ZrF4 and HfF4 for optical fibers and radiation-resistant glasses

被引：3
|
作者：
Kotsar', ML [1 ]
Bateev, VB [1 ]
Baskov, PB [1 ]
Sakharov, VV [1 ]
Fedorov, VD [1 ]
Shatalov, VV [1 ]
机构：
[1] All Russian Res Inst Chem Technol, Moscow 115230, Russia
来源：
INORGANIC MATERIALS | 2001年 / 37卷 / 10期
关键词：
Optical Fiber; Radioactive Waste; AlF3; CuF2; Liquid Radioactive Waste;
D O I：
10.1023/A:1012399615098
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The separation coefficients of ZrF4 (HfF4) and metal fluoride impurities in the process of vacuum sublimation between 900 and 1200 K in the molecular vaporization regime were calculated. The separation coefficients were found to decrease in the order CrF2 > MnF2 > NiF2 > CoF2 > MnF3 > FeF2 > AlF3 > CrF3 > CuF2 > FeF3. The conditions for purification of ZrF4 and HfF4 by vacuum sublimation were optimized. The total impurity content in both fluorides was found to increase with the product of the evaporation rate per unit area and the degree of evaporation. Fe was found to be the most difficult-to-remove impurity in ZrF4. and HfF4. The production rate of the sublimating plant is about 100 kg/year of ZrF4 and HfF4 sublimates. ZrF4 was used to prepare optical fibers for laser applications and noncontact fiber sensors for monitoring the composition and temperature of liquid radioactive waste. Fluorohafnate glasses were used to fabricate radiation-resistant scintillating modules of dimensions 20 x 30 x 150 mm, weighing less than or equal to0.5 kg.
引用
收藏
页码：1085 / 1091
页数：7
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