Dimorphisme et structure du disulfure de lanthane LaS2 |
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Authors: | Simone Benazeth Micheline Guittard Jean Flahaut |
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Affiliation: | Laboratoire de Chimie Minérale Structurale associé au CNRS (n° 200), Faculté des Sciences Pharmaceutiques et Biologiques de Paris V, 4, avenue de l''Observatoire, 75270 Paris Cédex 06, France |
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Abstract: | The stoichiometric lanthanum disulfide LaS2 presents a reversible phase transition at about 750°C. The α low-temperature form is monoclinic with the LaSe2 type. All the crystals are twinned with the same twin law (100). The cell parameters are a = 8.18, b = 8.13, c = 4.03Å, γ = 90°, space group . The β high-temperature form has the orthorhombic structure previously described with the parameters a = 8.13, b = 16.34, c = 4.14 Å; space group Pnma. The two structures are compared. |
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