Magnetic susceptibility measurements on actinide--Be$sub 13$ intermetallic compounds

Conference · Wed Jan 01 04:00:00 EST 1975 · AIP (Am. Inst. Phys.) Conf. Proc., no. 24, pp. 353-354

OSTI ID:4200508

Brodsky, M B; Friddle, R J

Magnetic susceptibilities were measured between 2 and 300$sup 0$K for the compounds AnBe$sub 13$ (An = Th, U, Np, Pu), all of which form the NaZn$sub 13$ structure. The susceptibility of ThBe$sub 13$ is temperature-independent. The data for UBe$sub 13$ and NpBe$sub 13$ may follow two Curie--Weiss regions with the breaks occurring at 200 and 70$sup 0$K respectively. The Curie--Weiss parameters are not substantially different for the two regimes, p/sub eff/ = 3.16 and 2.99 $mu$/sub B/ for UBe$sub 13$, and p/sub eff/ = 2.35 and 2.76 $mu$/sub B/ for NpBe$sub 13$. For PuBe$sub 13$, the Curie--Weiss fit requires a temperature independent term and yields chi$sub 0$ = 1.20 x 10$sup -6$ emu/g, P/sub eff/ = 0.74 $mu$/sub B//Pu, and theta = +11$sup 0$K. The intermediate coupling scheme yields 5f$sup 3$, 5f$sup 4$, 5f$sup 5$ configurations for the U, Np, and Pu compounds, respectively. Thus, each actinide ion is trivalent if the f-electrons are considered to be localized. Of these compounds, only PuBe$sub 13$ gives evidence for long-range magnetic order, becoming antiferromagnetic at T/sub N/ = 11.5$sup 0$K. (auth)

• Research Organization: Argonne National Lab., IL
• NSA Number: NSA-33-003581
• OSTI ID: 4200508
• Conference Information: Journal Name: AIP (Am. Inst. Phys.) Conf. Proc., no. 24, pp. 353-354
• Country of Publication: United States
• Language: English

Related Subjects

*BERYLLIUM ALLOYS-- MAGNETIC SUSCEPTIBILITY
360104* --Materials--Metals & Alloys--Physical Properties
ANTIFERROMAGNETISM-- NEEL TEMPERATURE-- PLUTONIUM ALLOYS
CURIE-WEISS LAW
INTERMETALLIC COMPOUNDS
LOW TEMPERATURE
MEDIUM TEMPERATURE
N50230* --Metals
Ceramics
& Other Materials--Metals & Alloys--Properties
Structure & Phase Studies
NEPTUNIUM ALLOYS
TEMPERATURE DEPENDENCE
THORIUM ALLOYS
ULTRALOW TEMPERATURE
VALENCE
VERY LOW TEMPERATURE URANIUM ALLOYS