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• W2000116409 abstract "We describe the preparation and some physical properties of Pu2O2Te. The plutonium oxide telluride is isostructural with the corresponding rare-earth oxide tellurides which crystallize in the tetragonal system of La2O2Te-type. Magnetic susceptibility data from 4 K to room temperature are reported together with resistivity measurements. Pu2O2Te 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 Pu2O2Te and Nd2O2Te. In Pu2O2Te, the Pu crystal radius is found to be much lower than that of Nd in Nd2O2Te, suggesting some 5f electron “delocalization” leading to a crystal radius shrinkage. As for the hexagonal Pu2O2X 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. Nous décrivons la préparation et quelques propriétés physiques de Pu2O2Te. L'oxytellurure de plutonium est isostructural des oxytellurures correspondants de terres rares qui cristallisent dans le système quadratique de type La2O2Te. On a mesuré sa susceptibilité magnétique ainsi que sa résistivité entre 4 K et la température ambiante. Pu2O2Te est antiferromagnétique au-dessous de 56 K et semiconducteur avec un gap intrinsèque de 0.65 eV. Le magnétisme a été interprété en terme d'interactions de superéchange à travers les orbitales p des non-métaux c'est-à-dire en terme de recouvrements 5f-p. Cette conclusion est confirmée par des considérations cristallochimiques en comparant les volumes de maile de Pu2O2Te et de Nd2O2Te. Dans Pu2O2Te, le rayon cristallin de Pu est bien inférieur à celui de Nd dans Nd2O2Te. Cela suggère que les électrons 5f se “délocalisent” ce qui conduit à une réduction du rayon cristallin. Comme pour les composés hexagonaux Pu2O2X oùX = O, S, Se le gap mesuré peut être considéré comme la différence d'énergie entre la bande np du chalcogène, et la bande de conduction 6d-7s, les états 5f occupés se trouvant juste au-dessous de la bande np en la recouvrant partiellement." @default.
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• W2000116409 date "1983-04-01" @default.
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• W2000116409 title "Crystal chemistry, magnetic, and electrical properties of the tetragonal plutonium oxide telluride Pu2O2Te" @default.
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• W2000116409 doi "https://doi.org/10.1016/0022-4596(83)90010-5" @default.
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