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High temperature and composition induced phase transitions in LiZnV1-xAsxO4 phenacites: Crystal structure and Raman spectroscopy studies
Univ Hassan 1er, Lab Sci Mat Milieux & Modelisat LS3M, Khouribga 25000, Morocco..
Dept Chim, Lab Physicochim Mat, Fst Errachidia, Morocco..
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Mineralogy Petrology and Tectonics.
Dept Chim, Lab Physicochim Mat, Fst Errachidia, Morocco..
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2015 (English)In: Spectrochimica Acta Part A - Molecular and Biomolecular Spectroscopy, ISSN 1386-1425, E-ISSN 1873-3557, Vol. 151, 956-964 p.Article in journal (Refereed) Published
Abstract [en]

In this work, using techniques of X-ray diffraction and Raman spectroscopy, we report the composition and high-temperature induced phase transition in the system LiZnV1-xAsxO4 (0 <= x <= 1). Both techniques showed that the increase of arsenic amount induced a structural transition from R-3 LiZnVO4 type to LiZnAsO4 type belonging to R3 space group, the transition occurring between x = 0.7 and x = 0.8. Furthermore, increasing temperature for the compositions (0.8 <= x <= 1) manifests a transition from the LiZnAsO4 structural type with R3 space group to the R-3 LiZnVO4 structural type. For this series, the transition from the space group R3 to the centro-symmetric space group R-3 shows considerable changes in the compositional and temperature dependencies of the bands: spectral positions of all the observed Raman bands exhibit shifts linearly proportional to the temperature increase, with points of shift-rate changes revealing a symmetry change. The Raman-spectra based temperature-composition phase diagram confirms the results obtained using the method of Rietveld refinements, thus showing the R-3 to R3 transition occurring between x = 0.7 and 0.8.

Place, publisher, year, edition, pages
2015. Vol. 151, 956-964 p.
Keyword [en]
LiZnV1-xAsxO4, Phenacite structure, Phase transition, X-ray diffraction, Rietveld refinements, High temperature Raman spectroscopy
National Category
Earth and Related Environmental Sciences Geochemistry
Research subject
Earth Science with specialization in Mineral Chemistry, Petrology and Tectonics
URN: urn:nbn:se:uu:diva-264804DOI: 10.1016/j.saa.2015.07.025ISI: 000361861300117PubMedID: 26186614OAI: oai:DiVA.org:uu-264804DiVA: diva2:866298
Swedish Research CouncilSida - Swedish International Development Cooperation Agency
Available from: 2015-11-02 Created: 2015-10-19 Last updated: 2016-02-17Bibliographically approved

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