Optical, magnetic and electronic properties of Ln{sub 2}O{sub 2}Te (Ln = La, Sm and Gd)

Journal Article · Tue Feb 05 04:00:00 EST 2008 · Materials Research Bulletin

DOI:https://doi.org/10.1016/j.materresbull.2007.03.008· OSTI ID:21068191

Llanos, Jaime ^[1]; Conejeros, Sergio; Cortes, Rodrigo; Sanchez, Victor ^[1]; Barahona, Patricia; Pena, Octavio ^[2]

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1. Departamento de Quimica, Universidad Catolica del Norte, Avda. Angamos 0610, Casilla 1280, Antofagasta (Chile)
2. Laboratoire de Chimie du Solide et Inorganique Moleculaire, UMR 6511-CNRS, Universite Rennes 1-Institut de Chimie de Rennes, 35042 Rennes Cedex (France)

The synthesis, the optical and magnetic properties and the electronic structure of the rare-earth oxytellurides of formula Ln{sub 2}O{sub 2}Te (Ln = La, Sm and Gd) are reported. The magnetic measurements show that La{sub 2}O{sub 2}Te exhibit a diamagnetic behavior. The value of the magnetization M of Gd{sub 2}TeO{sub 2} at our highest available field (50 kOe) is about 5.5{mu}{sub B}, well below the expected value for two independent Gd ions (2gJ = 14{mu}{sub B}) confirming the antiferromagnetic character of this compound. The magnetic properties of Sm{sub 2}TeO{sub 2} reveal that Sm is in its 3+ oxidation state with a large Van Vleck contribution. The electronic structure calculations, studied by means of a first principles DFT approach, are consistent with the optical measurements and suggest an indirect band gap semiconductor behavior.

• OSTI ID: 21068191
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 2 Vol. 43; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANTIFERROMAGNETISM
ELECTRONIC STRUCTURE
GADOLINIUM COMPOUNDS
GADOLINIUM IONS
LANTHANUM COMPOUNDS
MAGNETIC PROPERTIES
MAGNETIZATION
OPTICAL PROPERTIES
OXYTELLURIDES
SAMARIUM COMPOUNDS
SEMICONDUCTOR MATERIALS
SYNTHESIS