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Structure and crystallization behavior of the (Ba,Sr)HAsO (sub 4) .H (sub 2) O solid-solution in aqueous environments

Amalia Jimenez, Manuel Prieto, Miguel Angel Salvado and Santiago Garcia-Granda
Structure and crystallization behavior of the (Ba,Sr)HAsO (sub 4) .H (sub 2) O solid-solution in aqueous environments
American Mineralogist (April 2004) 89 (4): 601-609

Abstract

Crystals of different members of the (Ba,Sr)HAsO (sub 4) .H (sub 2) O solid solution have been synthesized, and the first structural studies indicate that they crystallize in the same space group, Pbca, with Z = 8. The unit-cell parameters are a = 7.436(2), b = 8.481(1), c = 14.348(6) Aa, and a = 7.752(1), b = 8.759(1), c = 14.668(3) Aa for the strontium and barium end-members, respectively. Both end-members have a layered structure with slices parallel to (001) linked by hydrogen bonds from the water molecules. These features are consistent with both the perfect cleavage on {001} and the morphological importance of this form in the crystals obtained. However, the two end-members are not isostructural and show differences in both the anionic hydrogen positions and number of hydrogen bonds. Complementary powder-diffraction measurements indicate that the cell parameters increase in a non-linear way with the barium content indicating that the solid solution is complete but could be non-ideal. Preliminary data suggest that barium partitions preferentially into the solid phase when crystallizing this solid solution from aqueous solutions.


ISSN: 0003-004X
EISSN: 1945-3027
Coden: AMMIAY
Serial Title: American Mineralogist
Serial Volume: 89
Serial Issue: 4
Title: Structure and crystallization behavior of the (Ba,Sr)HAsO (sub 4) .H (sub 2) O solid-solution in aqueous environments
Affiliation: Universidad de Oviedo, Departamento de Geologia, Oviedo, Spain
Pages: 601-609
Published: 200404
Text Language: English
Publisher: Mineralogical Society of America, Washington, DC, United States
References: 27
Accession Number: 2004-053352
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute.
Update Code: 200415
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