Mossbauer effect studies of iron-nickel alloys

Abstract

Face-centered-cubic (fee) Iron-Nickel alloys at concentrations near Fe67Ni33 show almost constant thermal expansion as a function of temperature in a wide range around room temperature. ~hese compounds are called Invar. A large number of competing theoretical models have been developed over the last thirty years, but none have been able to completely explain Invar behavior. An Fe67Ni33 alloy has been studied with the Mossbauer effect. A martensitic transformation was observed at - 210 K as the fee Invar sample changed to a body-centered-cubic (bee) non-Invar phase. Our investigations concentrate on the seldom studied bee phase in an effort to better under stand fcc-Invar behavior. Mossbauer effect measurements of the isomer shift, hyperfine field, and the quadrupole splitting are discussed. Anomalous behavior in the linewidths of the Mossbauer spectra for the bee phase have been observed.

Notes

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Graduation Date

1992

Semester

Fall

Advisor

Chow, Lee

Degree

Master of Science (M.S.)

College

College of Arts and Sciences

Department

Physics

Format

PDF

Pages

77 p.

Language

English

Length of Campus-only Access

None

Access Status

Masters Thesis (Open Access)

Identifier

DP0029782

Subjects

Arts and Sciences -- Dissertations, Academic; Dissertations, Academic -- Arts and Sciences

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