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Article Dans Une Revue Materials Research Bulletin Année : 1990

Crystal structure of γ-Cd(OH)2 or Cd2O(OH)2(H2O)

Etude structurale de γ-Cd(OH)2 ou Cd2O(OH)2(H2O)

Résumé

Single crystals of gamma-Cd(OH)2 were prepared from an intermediate product, Na2Cd(OH)4. The crystallographic study was conducted on an automatic diffractometer at room temperature and at 133 K. The final R value for 471 unique reflections was 2.7% (133 K). The structural study shows that , gamma-Cd(OH)2 has a three-dimensional linkage whereas weak hydrogen bonds are involved. The H atomic positions obtained at 133 K, are incompatible with a common hydroxide because of the presence of a water-like molecule. gamma-Cd(OH) 2 must be considered rather than an aquoxy-hydroxide of formulae: Cd2 O (OH)2 (H2O). All these results are confirmed by the I.R spectrum. The cell parameters at 133 K are: a = 5.664(2) Å; b = 10.223(3) Å; c = 3.404(2) Å; b = 91.52(3)°; z = 4; d obs (293 K) = 4.88 g.cm-3. The space group is Im.
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Dates et versions

hal-03271407 , version 1 (25-06-2021)

Identifiants

Citer

A Riou, Yannick Cudennec, Y Gerault. Etude structurale de γ-Cd(OH)2 ou Cd2O(OH)2(H2O). Materials Research Bulletin, 1990, 25 (8), pp.987 - 996. ⟨10.1016/0025-5408(90)90005-m⟩. ⟨hal-03271407⟩
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