Cited by 37Crystallization and Solubility StudiesCrystal Structures and PropertiesChemical and Physical Properties in Aqueous Solutions

Characterization and Crystallization of Ba(SO4,SeO4) Solid Solution

Andara, Angel José, Heasman, David M., Fernández-González, Ángeles, Prieto, Manuel·2005·Crystal Growth & Design

Abstract

Investigation of the equilibrium thermodynamics of the Ba(SO 4, SeO 4 )-H 2 O system has shown that sulfate ions partition preferentially into the solid solution. When crystallized under supersaturated conditions, the solid phase is, however, enriched in BaSeO 4 with respect to equilibrium compositions. The crystals exhibit sectorial zoning superimposed on concentric zoning. The solid solution was studied using precipitation experiments and crystallization in gel. Powder XRD analysis of the crystals formed in the precipitation experiments show that the unit cell parameters vary almost linearly with composition and that the excess volume of mixing is almost zero, suggesting that this solid solution is almost ideal. The crystals grown at high supersaturations in the gel are enriched in BaSeO 4 showing that under these conditions a deviation from equilibrium partitioning occurs. The crystals also exhibit concentric zoning with a BaSO 4 -rich core surrounded by BaSeO 4 -rich regions and, in crystals grown from solutions high in sulfate, a BaSO 4 -rich rim. Sectorial zoning is superimposed on the concentric zoning and is thought to be caused by preferential incorporation of BaSO 4 onto the {210} form which is important in the BaSO 4 endmember. The morphological changes of this solid solution as a function of composition are also described.

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Crossref · 10.1021/cg0497290

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  • High compositional gradients of crystals are a major characteristic of solid solutions with a great difference in the solubilities of the endmembers (2 to 3 orders of magnitude).

    “High compositional gradients of crystals have been proven to be a major characteristic of solid solutions with a great difference in the solubilities of the endmembers (2 to 3 orders of magnitude) [25, 26]”

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Authors
Andara, A. J., Heasman, D. M., Fernández-González, Á., & Prieto, M.
Affiliations
  • Universidad de Oviedo (ES)
  • Departamento de Geología, Universidad de Oviedo, Jesús Arias de Velasco, s/n, 33005 Oviedo, Spain, and Nucleo Universitario “Pedro Rincón Gutiérerez”, Edificio de Ingenieria, Merida (5101-A), Venezuela
Venue
Crystal Growth & Design
Published
2005-06-01
Volume
5
Issue
4
Pages
1371-1378
ISSN
  • 1528-7483 (ISSN-L)
  • 1528-7505
OpenAlex
W2093037528
Cited by
37
References
17
Citations by year
2026: 1 · 2025: 1 · 2024: 1 · 2023: 1 · 2022: 1 · 2021: 4 · 2020: 1 · 2018: 1 · 2017: 1 · 2016: 2 · 2015: 2 · 2013: 3 · 2012: 2
FWCI
1.83
Type
journal article
Language
en
Open access
closed
Locations
Crystal Growth & Design (publishedVersion)
Topics
  • Physical Sciences › Materials Science › Materials Chemistry › Crystallization and Solubility Studies
  • Physical Sciences › Materials Science › Electronic, Optical and Magnetic Materials › Crystal Structures and Properties
  • Physical Sciences › Chemical Engineering › Filtration and Separation › Chemical and Physical Properties in Aqueous Solutions
Keywords
barium sulfate, barium selenate, gel crystallization, lattice parameters, excess volume, crystal morphology, thermodynamic equilibrium

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