Crystal structure and magnetic properties of RCu/sub 4/Ag (R = rare earth) intermetallic compounds

Conference · Thu Jan 01 04:00:00 EST 1976 · AIP (Am. Inst. Phys.) Conf. Proc.; (United States)

OSTI ID:7125218

Takeshita, T; Malik, S K; El-Attar, A A; Wallace, W E

The RCu/sub 5/ intermetallic compounds crystallize either in the cubic AuBe/sub 5/ type structure or in the hexagonal CaCu/sub 5/ structure depending upon the particular rare earth ion involved. The effect of substituting Ag for one Cu on the structure stability of RCu/sub 5/ compounds has been investigated. It is observed that the compounds RCu/sub 4/Ag (R = Nd to Tm) crystallize in the AuBe/sub 5/ type structure. The magnetization of these compounds with R = Nd to Ho has been studied in temperature range 4.2 to 300/sup 0/K and in magnetic fields up to 21 kOe. The compounds with Nd, Sm, Gd and Tb are found to order antiferromagnetically with Neel temperature of 7, 7, 9 and 16.5/sup 0/K, respectively. The Dy and Ho compounds exhibit ferromagnetic behavior in magnetic fields larger than about 1 kOe. In the paramagnetic region, the magnetic susceptibility of all the compounds except that of SmCu/sub 4/Ag follows the Curie-Weiss law. The paramagnetic Curie temperatures of these compounds can be explained on the basis of RKKY theory with a suitable choice of the Fermi wave vector.

• Research Organization: Univ. of Pittsburgh
• OSTI ID: 7125218
• Conference Information: Journal Name: AIP (Am. Inst. Phys.) Conf. Proc.; (United States) Journal Volume: 34
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
ALLOY SYSTEMS
ALLOYS
COPPER ALLOYS
CRYSTAL STRUCTURE
CURIE POINT
INTERMETALLIC COMPOUNDS
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
PHYSICAL PROPERTIES
RARE EARTH ALLOYS
SILVER ALLOYS
TERNARY ALLOY SYSTEMS
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE