Optical constants and crystal chemical parameters of Sc{sub 2}W{sub 3}O{sub 12}
- Institut fuer Mineralogie, Fakultaet fuer Geowissenschaften, Ruhr-Universitaet Bochum, Universitaetsstrasse 150, D-44780 Bochum (Germany)
- Department of Chemistry, Oregon State University, Corvallis, OR 97331-4003 (United States)
- Universitaet Bremen, FB 5 Geowissenschaften, Klagenfurter Strasse, D-28359 Bremen (Germany)
Highlights: Black-Right-Pointing-Pointer Single crystal growth of Sc{sub 2}W{sub 3}O{sub 12}. Black-Right-Pointing-Pointer Optical constants of Sc{sub 2}W{sub 3}O{sub 12} redetermined. Black-Right-Pointing-Pointer Difference between obs. and calc. polarizabilities attributed to crystal structure. -- Abstract: The refractive indices of Sc{sub 2}W{sub 3}O{sub 12}, measured at wavelengths of 435.8-643.8 nm, were used to calculate n{sub a} = 1.7331, n{sub b} = 1.7510, n{sub c} = 1.7586 at {lambda} = 589.3 nm and n{sub {infinity}} values at {lambda} = {infinity} from a one-term Sellmeier equation. Mean refractive indices, Left-Pointing-Angle-Bracket n{sub D} Right-Pointing-Angle-Bracket , and mean dispersion values, Left-Pointing-Angle-Bracket A Right-Pointing-Angle-Bracket , are, respectively, 1.7475 and 110 Multiplication-Sign 10{sup -16} m{sup 2}. Total electronic polarizabilities, {alpha}{sub obs}, were calculated from n{sub {infinity}} and the Lorenz-Lorentz equation. The unusually large difference between the observed polarizability of 28.415 Angstrom-Sign {sup 3} and the calculated total polarizability {alpha}{sub T} of 26.74 Angstrom-Sign {sup 3} ({Delta} = +6.3%) is attributed to (1) a large M-O-W angle, and (2) a high degree of W 5d-O 2p and Sc nd-O 2p hybridization, where n signifies unspecified Sc d orbitals.
- OSTI ID:
- 22212405
- Journal Information:
- Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 2 Vol. 47; ISSN MRBUAC; ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
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