Etude structurale des composés MxTiSe2 (M = Fe,Co, Ni) |
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Authors: | Y Arnaud M Chevreton A Ahouandjinou M Danot J Rouxel |
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Institution: | Laboratoire d''Etude des Matériaux, 303 INSA, 20 avenue Albert Einstein, 69621 Villeurbanne Cédex, France;Laboratoire de Chimie Minérale A, U.E.R. de Chimie, B.P. No. 1044-44037 Nantes Cédex, France |
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Abstract: | New compounds MxTiSe2 have been prepared with M = Fe (x ? 0.66), M = Co or Ni (x ? 0.50). The metal M is located in vacant octahedral sites of the TiSe2 host lattice (hexagonal unit cell a′, c′). An ordering of vacancies occurs if x ? 0.20. With M = Co or Ni (x = 0.50) and with M = Fe (0.25 ? x ? 0.66) isotypic compounds of Ti3Se4 can be obtained (M3 □ X4 type; monoclinic unit cell a ≈ a′ √3, b ≈ a′, c ≈ 2c′). The compounds Fe0.38TiSe2 and Co0.38TiSe2 (hexagonal unit cell a ≈ a′ √3, c ≈ 2c′) are of the M2 □ X3 type, variety 2c′. The Fe0.25TiSe2 and Co0.25TiSe2 monoclinic unit cells (a ≈ 2a′ √3, b ≈ 2a′, c ≈ 2c′) allow us to assume, for these two compounds, a structure of the M5 □ 3X8 type, variety 2c′, identical to the Ti5Se8 one. The compound Ni0.25TiSe2 has an hexagonal unit cell (a ≈ 2a′, c ≈ 3c′); it belongs to a so-called 3c′ variety of the M5 □ 3X8 type. |
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