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

Abstract

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.

Authors:
; ; ;
Publication Date:
Research Org.:
Univ. of Pittsburgh
OSTI Identifier:
7125218
Resource Type:
Conference
Journal Name:
AIP (Am. Inst. Phys.) Conf. Proc.; (United States)
Additional Journal Information:
Journal Volume: 34; Conference: Joint international magnetism and magnetic materials intermag conference, Pittsburgh, PA, USA, 15 Jun 1976; Other Information: See CONF-760619--
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; COPPER ALLOYS; CRYSTAL STRUCTURE; MAGNETIC PROPERTIES; RARE EARTH ALLOYS; SILVER ALLOYS; CURIE POINT; INTERMETALLIC COMPOUNDS; MAGNETIC SUSCEPTIBILITY; TERNARY ALLOY SYSTEMS; ALLOY SYSTEMS; ALLOYS; PHYSICAL PROPERTIES; THERMODYNAMIC PROPERTIES; TRANSITION TEMPERATURE; 360102* - Metals & Alloys- Structure & Phase Studies

Citation Formats

Takeshita, T, Malik, S K, El-Attar, A A, and Wallace, W E. Crystal structure and magnetic properties of RCu/sub 4/Ag (R = rare earth) intermetallic compounds. United States: N. p., 1976. Web.
Takeshita, T, Malik, S K, El-Attar, A A, & Wallace, W E. Crystal structure and magnetic properties of RCu/sub 4/Ag (R = rare earth) intermetallic compounds. United States.
Takeshita, T, Malik, S K, El-Attar, A A, and Wallace, W E. Thu . "Crystal structure and magnetic properties of RCu/sub 4/Ag (R = rare earth) intermetallic compounds". United States.
@article{osti_7125218,
title = {Crystal structure and magnetic properties of RCu/sub 4/Ag (R = rare earth) intermetallic compounds},
author = {Takeshita, T and Malik, S K and El-Attar, A A and Wallace, W E},
abstractNote = {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.},
doi = {},
journal = {AIP (Am. Inst. Phys.) Conf. Proc.; (United States)},
number = ,
volume = 34,
place = {United States},
year = {1976},
month = {1}
}

Conference:
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