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