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Synthesis, Ultrapurification and Analysis of LaF3 for Fluoride Optical Fibers

Published online by Cambridge University Press:  25 February 2011

D. R. Gabbe ,
R. C. Folweiler  and
F. X. Pink
D. R. Gabbe
Affiliation:
Crystal Physics and Optical Electronics Laboratory, Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139
R. C. Folweiler
Affiliation:
GTE Laboratories, Inc., Waltham, MA 02154
F. X. Pink
Affiliation:
GTE Laboratories, Inc., Waltham, MA 02154
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Abstract

Lanthanum chloride was synthesized by reacting La2O3 with CCl4. Purification carried out by zone refining resulted in reduction of Nd and Eu concentrations by at least a factor of 103. Impurity segregation coefficients were calculated from the concentration profiles in the charge measured by neutron activation analysis. Values of 0.85, 0.5, and 0.15 were found for Ce, Nd and Eu while a value of 0.65 was obtained for Pr from a plot of measured distribution coefficient versus ionic radius. These results show the feasibility of removing rare earth impurities to the ppb level from LaCl3. After purification, LaC13 is converted to LaF3

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 88: Symposium P – Optical Fiber Materials and Properties , 1986 , 119
Copyright
Copyright © Materials Research Society 1987

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References

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