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Material and Spectroscopic Properties of Cr in Different Oxidation States in Calcium Fluorapatite

Published online by Cambridge University Press:  15 February 2011

J. B. Gruber ,
J. A. Hutchinson ,
D. C. Harris ,
M. D. Seltzer ,
T. H. Allik ,
C. A. Morrison  and
M. P. Scripsick
J. B. Gruber
Affiliation:
Department of Physics, San Jose State University, San Jose, CA 95192
J. A. Hutchinson
Affiliation:
Night Vision and Electronic Sensors Directorate, Fort Belvoir, VA 22060
D. C. Harris
Affiliation:
Chemistry Division, Research Department, NAWCWPNS, China Lake, CA 93555
M. D. Seltzer
Affiliation:
Chemistry Division, Research Department, NAWCWPNS, China Lake, CA 93555
T. H. Allik
Affiliation:
Science Applications International Corporation, McLean, VA 22102
C. A. Morrison
Affiliation:
Applied Physics Branch, U.S. Army Adelphi Lab. Center, Adelphi, MD 20783
M. P. Scripsick
Affiliation:
Department of Physics, West Virginia University, Morgantown, WV 26505
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Abstract

The material and spectroscopic properties of Cr-doped Ca5(PO4)3F (FAP) were investigated using several different chemical and physical means. From analytical titration measurements the chromium in Cr:FAP was found to be tetravalent. ESR measurements detected a trace (0.5 - 10 ppm) of Cr5+ (3d1) and no evidence for Cr3+ (3d3). The absorption and emission spectra of Cr: FAP can be interpreted on the basis of Cr4+ (3d2) ions substituting for P within a distorted tetrahedron of oxygen ions. Calculated electronic (Stark) levels for Cr4+ based on an approximate site symmetry of C4 agree well with levels deduced from an analysis of the experimental optical data. The model Hamiltonian includes Coulombic parameters B and C, interconfiguration interaction terms and the spin-orbit coupling for the 3d2 atomic configuration of Cr4+ and crystal-field terms in C4 symmetry. The parametrized Hamiltonian was diagonalized within the complete d2 configuration. Both free ion and crystal field parameters are presented.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 329: Symposium R – New Materials for Advanced Solid State Lasers , 1993 , 209
Copyright
Copyright © Materials Research Society 1994

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References

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