Evolution of magnetism from mixed-valent CeIr/sub 3/B/sub 2/ to trivalent CeIr/sub 3/Si/sub 2/

Journal Article · Tue Dec 01 00:00:00 EST 1987 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.36.8929· OSTI ID:5619398

Umarji, A M; Dhar, S K; Malik, S K; Vijayaraghavan, R

The ternary compound CeIr/sub 3/B/sub 2/ is a mixed-valent material crystallizing in a monoclinic structure, closely related to the hexagonal CeCo/sub 3/B/sub 2/-type structure. The structural and magnetic phase diagrams of the systems CeRh/sub 3-//sub y/Ir/sub y/B/sub 2/ (y = 0--2) and CeIr/sub 3/B/sub 2-//sub x/Si/sub x/ (x = 0--2) have been investigated. Properties of the new compound CeIr/sub 3/Si/sub 2/ have been reported for the first time. It is shown that the structure of CeIr/sub 3/B/sub 2/ transforms to the hexagonal type on substitution of Rh and Si at Ir and B sites, respectively. Accompanying the structural transformation is an electronic transition in which the mixed-valent Ce atoms become more magnetic. The observed ferromagnetic ground state is similar to the one seen in CeRh/sub 3/B/sub 2/ (T/sub C/ = 115 K and ..mu../sub sat/ = 0.4..mu../sub B/). The role of Ce-atom ligands and their hybridization is thought to be the primary cause for the unusual nature magnetism in CeT/sub 3/B/sub 2/-type compounds.

• Research Organization: Tata Institute of Fundamental Research, Bombay 400 005, India
• OSTI ID: 5619398
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Vol. 36:16
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CERIUM BORIDES
MAGNETIC SUSCEPTIBILITY
VALENCE
CERIUM SILICIDES
IRIDIUM BORIDES
IRIDIUM SILICIDES
HYBRIDIZATION
LATTICE PARAMETERS
LIGANDS
LOW TEMPERATURE
MEDIUM TEMPERATURE
ULTRALOW TEMPERATURE
VERY LOW TEMPERATURE
X-RAY DIFFRACTION
BORIDES
BORON COMPOUNDS
CERIUM COMPOUNDS
COHERENT SCATTERING
DIFFRACTION
IRIDIUM COMPOUNDS
MAGNETIC PROPERTIES
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
REFRACTORY METAL COMPOUNDS
SCATTERING
SILICIDES
SILICON COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
360204* - Ceramics
Cermets
& Refractories- Physical Properties