High temperature and composition induced phase transitions in LiZnV1-xAsxO4 phenacites: Crystal structure and Raman spectroscopy studies
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
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.
LiZnV1-xAsxO4, Phenacite structure, Phase transition, X-ray diffraction, Rietveld refinements, High temperature Raman spectroscopy
Earth and Related Environmental Sciences Geochemistry
Research subject Earth Science with specialization in Mineral Chemistry, Petrology and Tectonics
IdentifiersURN: urn:nbn:se:uu:diva-264804DOI: 10.1016/j.saa.2015.07.025ISI: 000361861300117PubMedID: 26186614OAI: oai:DiVA.org:uu-264804DiVA: diva2:866298
FunderSwedish Research CouncilSida - Swedish International Development Cooperation Agency