Siritanon, M. A.
Department of Chemistry, Oregon State University, Corvallis, OR 97331-4003
Geological Sciences/CIRES, University of Colorado, Boulder, Colorado 80309
R. X. Fischer
Fachbereich Geowissenschaften, Universität Bremen, Klagenfurter Straße, D-28359 Bremen.
George R. Rossman
of Geological and Planetary Sciences, California Institute of
Pasadena, California 91125-2500, USA
Refractive indices of In2O3, In2-xSnxO3, InBO3 and 2 different gahnite crystals (Zn0.95Fe0.05Al2O4 and Zn0.91Mg0.04Mn0.03Fe0.03Al1.99Fe0.01O4) were measured at wavelengths of 435.8 to 643.8 nm and were used to calculate n at lambda = 589.3 nm (nD ) and at lambda = infinity (ninfinity) using the one-term Sellmeier equation 1/(n2-1) = -A/lambda2 + B. Total polarizabilities, atotal, were calculated from ninfinity and the Lorenz-Lorentz equation. Refractive indices, nD and dispersion values, A, are, respectively, 2.093 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 Zn0.95Fe0.05Al2O4; 1.7940 and 57 x 10-16 m2 for Zn0.91Mg0.04Mn0.03Fe0.03Al1.99Fe0.01O4 and no = 1.8782 and ne = 1.7756 and <63> x 10-16 m2 for InBO3. The lack of consistency of the polarizabilities of Zn2+ in ZnO and In3+ in In2O3 with the Zn2+ and In3+ polarizabilities in other Zn- and In-containing compounds is correlated with structural strain and very high dispersion of ZnO and In2O3.