Crystal structure and magnetic properties of americium laves phases

Conference · Mon Sep 01 00:00:00 EDT 1975

OSTI ID:4179873

Aldred, A T; Dunlap, B D; Lam, D J; Shenoy, G K

An investigation was made of a series of binary americium alloys with AB$sub 2$ stoichiometry (B = Al, Co, Fe, Rh and Ru) prepared from the $sup 243$Am isotope. The C-15 (MgCu$sub 2$-type) structure appears in AmAl$sub 2$, AmCo$sub 2$, AmFe$sub 2$, and AmRh$sub 2$, whereas AmRu$sub 2$ is isostructural with AmOs$sub 2$ which has the C-14 (MgZn$sub 2$-type) structure. The magnetic properties of the cubic americium laves phases were studied by means of magnetization and nuclear gamna-ray resonance (Moessbauer effect) measurements between 2.5 and 300$sup 0$K. All the cubic Laves phases studied, except AmFe$sub 2$, exhibit almost temperature-independent paramagnetism. The AmFe$sub 2$ sample is ferromagnetic with an estimated Curie temperature of approximately 400$sup 0$K. The hyperfine field at the Am site in all the compounds is small. The bulk magnetic moment of AmFe$sub 2$ (approximately 3 $mu$/sub B//F.U.) is thus associated only with the Fe atoms. The magnetic properties of the compounds are consistent with the assumption that the Am ion is in the +3 state (5f6). (auth)

• Research Organization: Argonne National Lab., Ill. (USA)
• DOE Contract Number: W-31109-ENG-38
• NSA Number: NSA-33-005958
• OSTI ID: 4179873
• Report Number(s): CONF-750913--15
• Country of Publication: United States
• Language: English

Related Subjects

*AMERICIUM ALLOYS-- MAGNETIC PROPERTIES
360104* --Materials--Metals & Alloys--Physical Properties
ALUMINIUM ALLOYS
COBALT ALLOYS
CRYSTAL STRUCTURE
IRON ALLOYS
LAVES PHASES
MOESSBAUER EFFECT
N50230* --Metals
Ceramics
& Other Materials--Metals & Alloys--Properties
Structure & Phase Studies
RUTHENIUM ALLOYS
TEMPERATURE DEPENDENCE RHODIUM ALLOYS