| Study of Ga(3+)-Induced Hydrothermal Crystallization of an α-Quartz Type Ga(1-x)Fe(x)PO(4) Single Crystal by in Situ X-ray Absorption Spectroscopy (XAS). | |
| | |
MedLine Citation:
|
PMID: 23057790 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
|
The dissolution of α-FePO(4) and the α-Ga(0.75)Fe(0.25)PO(4) solid solution with α-quartz-type structures under hydrothermal conditions in 1 M HNO(3) aqueous solution was investigated by in situ X-ray absorption spectroscopy (XAS) at the Fe K-edge. The solubility of α-FePO(4) increases with temperature and is higher at 25 MPa than at 50 MPa. The Fe(3+) cation in solution is 6-fold coordinated with an average Fe-O distance close to 2.0 Å. A similar experiment was performed with a solid solution of α-quartz-type Ga(0.75)Fe(0.25)PO(4) as the starting phase under a pressure of 25 MPa. By varying the temperature from 303 K up to 573 K a single crystal was grown with 23% Fe(3+) with the α-quartz-type structure. These results show that the crystallization of pure α-quartz-type FePO(4) by the hydrothermal method is not possible due to the formation of very stable Fe(3+) hexa-aquo complexes [Fe(H(2)O)(6)](3+) and to the absence of FeO(4) tetrahedra in solution. Ga(3+) cations in solution induce the formation of gallophosphate complexes at the solid-liquid interface, which are at the origin of the nuclei for crystallization. We propose a crystallization mechanism in which the Fe(3+) substitutes Ga(3+) with a 4-fold coordination in mixed (iron/gallo)-phosphate complexes that leads to the growth of an α-quartz-type Ga(0.77)Fe(0.23)PO(4) single crystal. |
| | |
Authors:
|
Manhal Souleiman; Olivier Cambon; Abel Haidoux; Julien Haines; Claire Levelut; Vincent Ranieri; Jean-Louis Hazemann |
Publication Detail:
|
Type: JOURNAL ARTICLE Date: 2012-10-11 |
Journal Detail:
|
Title: Inorganic chemistry Volume: - ISSN: 1520-510X ISO Abbreviation: Inorg Chem Publication Date: 2012 Oct |
Date Detail:
|
Created Date: 2012-10-12 Completed Date: - Revised Date: - |
Medline Journal Info:
|
Nlm Unique ID: 0366543 Medline TA: Inorg Chem Country: - |
Other Details:
|
Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
|
Institut Charles Gerhardt Montpellier, Equipe C2M, UMR CNRS-UM2-ENSCM-UM1 5253, Université Montpellier 2 , Place Eugène Bataillon, CC1504, 34095 Montpellier Cedex 5, France. |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
|
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: A Cognitive-Interpersonal Model of Adolescent Depression: The Impact of Family Conflict and Depresso...
Next Document: Open-Label Extension Study of Flibanserin in Women with Hypoactive Sexual Desire Disorder.