Award Date

Spring 2010

Degree Type

Thesis

Degree Name

Master of Science in Physics

Department

Physics and Astronomy

Advisor 1

Lon Spight, Committee Chair

First Committee Member

Dave Schiferl, Committee Co-Chair

Second Committee Member

Pamela Burnley

Third Committee Member

Len Zane

Graduate Faculty Representative

Adam Simon

Number of Pages

66

Abstract

The dual partial phonon density of states (DOS) from two different Mossbauer isotopes (161Dy and 57Fe) in the same material (DyFe3) was successfully measured using the nuclear resonant inelastic x-ray scattering (NRIXS) technique at high pressure. Nuclear inelastic scattering measurements yield an in-depth understanding of the element-specific dynamic properties. The Debye temperatures, the Lamb-Mossbauer factor (fLM), and the vibrational contributions to the Helmholtz free energy (Fvib), specific heat (cV ), entropy (Svib) and internal energy (Uvib) are calculated directly from the phonon density of states.

Keywords

57 Fe; 161Dy; DyFe3; Dysprosium; Element properties; Iron; Mossbauer isotopes; Phonon density of states

Disciplines

Biological and Chemical Physics | Condensed Matter Physics

Language

English


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