Morphology of polar ASO3·6H2O crystals (A = Ni, Co, Mg) and solvent interaction
1990; Elsevier BV; Volume: 106; Issue: 4 Linguagem: Inglês
10.1016/0022-0248(90)90035-j
ISSN1873-5002
Autores Tópico(s)Crystallization and Solubility Studies
ResumoThe PBC analysis of the polar ASO3·6H2O structure leads to the F-forms {001}, {001}, {111}, {111}, {011}, {011}, {011} and {011}. Attachment energies and slice energies were calculated using an electrostatic point charge model. Two centrosymmetric theoretical habits are derived. One, based on slice energies, is prismatic with {011} and {011} as main forms, the other, based on attachment energies, is isometric with only {001} and {001}. The observed polar habit is explained in terms of the interaction of water molecules with the exposed oxygens of the sulphite ion. This interaction decreases the growth rate of {111}, {011} and {001}, while the {011} prisms is more affected than {011}, in qualitative agreement with the observed habit.
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