Magnetic properties of actinide Laves phases

Conference · Thu Jan 01 00:00:00 EST 1976

OSTI ID:7128674

Aldred, A T; Dunlap, B D; Lander, G H

This paper reviews recent high-field (up to 80 kOe) magnetization, nuclear-gamma-ray resonance, and neutron diffraction measurements on a number of actinide ferromagnets with the C-15 Laves phase crystal structure. NpAl/sub 2/ and NpOs/sub 2/ are an interesting contrast; NpAl/sub 2/ behaves as a localized 5f system whereas NpOs/sub 2/ exhibits properties usually associated with itinerant ferromagnets. The second part of the paper reports similar measurements on the series AnFe/sub 2/, where An = U, Np, Pu, and Am. The properties of these compounds suggest an increasing localization of 5f electrons as one proceeds from uranium to americium. The Pu ion in PuFe/sub 2/ is definitely trivalent 5f/sup 5/, but the observation of a small negative moment on the Am site in AmFe/sub 2/ implies a partial occupancy of the Am/sup 2 +/ 5f/sup 7/ state in this compound. This is the first indication of a mixed valence configuration in an actinide system.

• Research Organization: Argonne National Lab., IL (USA)
• DOE Contract Number: W-31-109-ENG-38
• OSTI ID: 7128674
• Report Number(s): CONF-760956-3; TRN: 77-004849
• Resource Relation: Conference: 2. international conference on the electronic structures on the actinides, Wroclaw, Poland, 13 Sep 1976
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ACTINIDE ALLOYS
MAGNETIC PROPERTIES
ALUMINIUM ALLOYS
AMERICIUM ALLOYS
IRON ALLOYS
NEPTUNIUM ALLOYS
PLUTONIUM ALLOYS
URANIUM ALLOYS
LAVES PHASES
MAGNETIC MOMENTS
MAGNETIZATION
MOESSBAUER EFFECT
NEUTRON DIFFRACTION
ALLOYS
COHERENT SCATTERING
DIFFRACTION
PHYSICAL PROPERTIES
SCATTERING
360104* - Metals & Alloys- Physical Properties