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Substoichiometric precipitation of fluoride with lanthanum

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Abstract

The substoichiometric precipitation of fluoride with lanthanum was studied by using18F and140La tracers and it was found that fluoride could be precipitated substoichiometrically with lanthanum and the reaction ratio between fluoride and lanthanum was 3∶1. The pH range at which fluoride can be separated substoichiometrically with lanthanum is between 2 and 8. Barium and indium interfere in the precipitation of fluoride, sodium, copper and manganese, however, not. Fluorosilicate can also be precipitated substoichiometrically by using lanthanum as a precipitant and the reaction ratio between fluorosilicate and lanthanum was 1∶2. This separation was applied for the determination of oxygen in silicon crystals. The concentration of oxygen measured in some silicon crystals was between 5 and 27 ppm and in good agreement with those by non-destructive method and infrared spectrophotometry.

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Authors and Affiliations

  1. Ibaraki Electrical Communication Laboratory, Nippon Telegraph and Telephone Public Corporation, 319-11, Tokai, Ibaraki, (Japan)

    K. Shikano & K. Kudo

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  1. K. Shikano
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  2. K. Kudo
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Shikano, K., Kudo, K. Substoichiometric precipitation of fluoride with lanthanum. J. Radioanal. Chem. 78, 71–79 (1983). https://doi.org/10.1007/BF02519751

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  • DOI: https://doi.org/10.1007/BF02519751

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