LATTICE-DYNAMICS OF CR2O3

SCHOBER, H and MAY, T and DORNER, B and STRAUCH, D and STEIGENBERGER, U and MORRII, Y (1995) LATTICE-DYNAMICS OF CR2O3. ZEITSCHRIFT FUR PHYSIK B-CONDENSED MATTER, 98 (2). pp. 197-205. ISSN 0722-3277,

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Abstract

We present the results of inelastic neutron scattering experiments for Cr(2)O(3) carried out using the single-crystal time-of-flight spectrometer PRISMA at ISIS (U.K.) as well as the three-axis spectrometer TAS-1 at JAERI (J). The collected data are analysed on the basis of phenomenological shell models showing convincing agreement between calculation and experiment both for the frequencies and intensities. All together the dispersion relations of 12 out of 20 phonon branches along the three-fold axis are determined. By a comparison with the Cr(2)O(3) iso-type sapphire (A1(2)O(3)) it is found that the dynamical response of the oxygen ion is only little affected by the ionic substitution. The chromium d electrons find their expression mainly in a strengthening of the metal-oxygen bonding. The problem of ionic polarizabilities is addressed in detail both for the oxygen and chromium ions.

Item Type:	Article
Uncontrolled Keywords:	SAPPHIRE CORUNDUM; PHONON DISPERSION; CRYSTALS; TRANSITION; CONSTANTS; RAMAN;
Depositing User:	Dr. Gernot Deinzer
Last Modified:	19 Oct 2022 08:37
URI:	https://pred.uni-regensburg.de/id/eprint/52422

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