Crystal chemistry, magnetic, and electrical properties of the tetragonal plutonium oxide telluride Pu/sub 2/O/sub 2/Te

Journal Article · Fri Apr 01 04:00:00 EST 1983 · J. Solid State Chem.; (United States)

DOI:https://doi.org/10.1016/0022-4596(83)90010-5· OSTI ID:5559670

Constantini, J M ^[1]; Damien, D; Novion, C H; Blaise, A; Cousson, A; Abazli, H; Pages, M

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1. DECPu-SEFCAE, CEN., Fontenay-aux-Roses, France

The preparation and some physical properties of Pu/sub 2/O/sub 2/Te are described. The plutonium oxide telluride is isostructural with the corresponding rare-earth oxide tellurides which crystallize in the tetragonal system of La/sub 2/O/sub 2/Te-type. Magnetic susceptibility data from 4 K to room temperature are reported together with resistivity measurements. Pu/sub 2/O/sub 2/Te is found to be an antiferromagnet below 56 K and a semiconductor with an intrinsic energy gap of 0.65 eV. The magnetic behavior is interpreted in terms of superexchange coupling interactions via nonmetal p orbitals, i.e., in terms of 5f-p overlaps. This conclusion is supported by crystal chemistry considerations by comparison of cell volumes of Pu/sub 2/O/sub 2/Te and Nd/sub 2/O/sub 2/Te. In Pu/sub 2/O/sub 2/Te, the Pu crystal radius is found to be much lower than that of Nd in Nd/sub 2/O/sub 2/Te, suggesting some 5f electron ''delocalization'' leading to a crystal radius shrinkage. As for the hexagonal Pu/sub 2/O/sub 2/X compounds, with X =O,S,Se, the measured gap may be considered as the energy separation between the chalcogen np band and the 6d-7s conduction band, the occupied 5f states lying just below the np band with some 5f-np overlap.

• OSTI ID: 5559670
• Journal Information: J. Solid State Chem.; (United States), Journal Name: J. Solid State Chem.; (United States) Vol. 47:2; ISSN JSSCB
• Country of Publication: United States
• Language: English

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ACTINIDE COMPOUNDS
CHALCOGENIDES
CHEMICAL PREPARATION
COMPARATIVE EVALUATIONS
CRYSTAL STRUCTURE
LANTHANUM COMPOUNDS
LOW TEMPERATURE
MAGNETIC PROPERTIES
MEDIUM TEMPERATURE
NEODYMIUM COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PLUTONIUM COMPOUNDS
PLUTONIUM OXIDES
PLUTONIUM TELLURIDES
RARE EARTH COMPOUNDS
SYNTHESIS
TELLURIDES
TELLURIUM COMPOUNDS
TRANSURANIUM COMPOUNDS
ULTRALOW TEMPERATURE
VERY LOW TEMPERATURE