Refractive Index and Optical Dispersion of In2O3, InBO3 and Gahnite

O. Medenbach
Institut für Mineralogie, Fakultät fur Geowissenschaften, Ruhr-Universität Bochum
Universitätstraße 150, D-44780 Bochum

Theeranun  Siritanon and M. A. Subramanian
Department of Chemistry, Oregon State University, Corvallis, OR 97331-4003

D. Dettmar
Institut für Mineralogie, Fakultät fur Geowissenschaften, Ruhr-Universität Bochum
Universitätstraße 150, D-44780 Bochum

R.D. Shannon
Geological Sciences/CIRES, University of Colorado, Boulder, Colorado 80309

R. X. Fischer
Fachbereich Geowissenschaften, Universität Bremen, Klagenfurter Straße, D-28359 Bremen

George R. Rossman
Division of Geological and Planetary Sciences, California Institute of Technology
Pasadena, CA 91125-2500


Abstract

Refractive indices of In2O3, In2-xSnxO3, InBO3 and 2 different gahnite crystals, (Zn.95Fe.05)Al2O4  and  (Zn.91Mg.04Mn.03Fe.03)[Al1.99Fe.01]O4were measured at wavelengths of 435.8 to 643.8 nm and were used to calculate n at l = 589.3 nm ( nD ) and at l = ¥ (n¥) using the one-term Sellmeier equation  1/(n2-1) = -A/l2 + B. Total polarizabilities, atotal, were calculated from n¥ and the Lorenz-Lorentz equation. Refractive indices, nD and dispersion values, A, are, respectively, 2.093 x 10-16 m2 and 133 x 10-16 m2 for In2O3; 2.0755 and 138 x 10-16 m2 for In2-xSnxO3; 1.7995 and 56 x 10-16 m2 for Zn.95Fe.05Al2O4; 1.7940 and 57 x 10-16 m2 for Zn.91Mg.04Mn.03Fe.03Al1.99Fe.01O4  and and no  = 1.8782 and ne = 1.7756 and <63> x 10-16 m2 for InBO3.