Accession Number : AD0681511

Title :   ATOMIC VIBRATIONS IN STRESSED CRYSTAL LATTICES BY INELASTIC SCATTERING OF NEUTRONS.

Descriptive Note : Final scientific rept. 1 Oct 62-30 Sep 68,

Corporate Author : OESTERREICHISCHE STUDIENGESELLSCHAFT FUER ATOMENERGIE G M B H SEIBERSDORF PHYSICS INST

Personal Author(s) : Weinzierl,P.

Report Date : 27 NOV 1968

Pagination or Media Count : 14

Abstract : A scattering chamber for inelastic neutron scattering at pressures up to 3000 atm was constructed. This pressure proved to be large enough to induce in some materials phonon frequency shifts of the order of 1% which are measurable by the inelastic neutron scattering technique. Measurements on pressure induced frequency shifts of some phonons in lead and sodium iodide were made. The phonon frequency distribution in the random binary alloy Pt + Cu (5%) was compared with that of a pure Pt sample. Also measured was the change of phonon frequency distribution of very fine MgO powders against that of large-crystalline samples. (Author)

Descriptors :   (*CRYSTAL LATTICES, VIBRATION), (*PHONONS, FREQUENCY SHIFT), NEUTRON SCATTERING, INELASTIC SCATTERING, CRYSTAL DEFECTS, PRESSURE, IMPURITIES, MAGNESIUM OXIDES, PLATINUM ALLOYS, SODIUM COMPOUNDS, IODIDES, LEAD(METAL), AUSTRIA

Subject Categories : Crystallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE