High-pressure study of antiferromagnetic ordering in gamma-Fe
Abstract
The magnetism of face-centered cubic iron (gamma-Fe) under high pressure was investigated in gamma-Fe precipitates in copper and the type 310 stainless steel. The antiferromagnetic ordering was studied by Moessbauer effect. Thermal sean technique was used to determine the Neel temperatures. Results show the Neel temperatures in both alloys decreased with increasing pressure. This contradicts the predictions of popular models for Invar alloys; namely, Kondorsky's localized model and Weiss' two-gamma-state model, but may be explained in terms of band antiferromagnetism. In the case of the gamma-Fe precipitates in copper, the Neel temperature decreased from 45 K at 1 bar to 25 C at 40 kbar, with a rate of -0.5 K/kbar. The Neel temperature of stainless steel 310 decreased from 42 K at 1 bar with nearly the same rate.
- Publication:
-
Ph.D. Thesis
- Pub Date:
- 1978
- Bibcode:
- 1978PhDT........56L
- Keywords:
-
- Antiferromagnetism;
- Face Centered Cubic Lattices;
- High Pressure;
- Iron Alloys;
- Mossbauer Effect;
- Copper;
- Neel Temperature;
- Precipitates;
- Precipitation (Chemistry);
- Stainless Steels;
- Solid-State Physics