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Temperature and nickel substitution effects on the phase transitions in the Sr2Zn1-xNixWO6 ( 0 <= x <= 1) double perovskite
Univ Hassan 1er, LS3M, Khouribga 25000, Morocco..
Univ Hassan 1er, LS3M, Khouribga 25000, Morocco..
Univ Hassan 1er, LS3M, Khouribga 25000, Morocco..
Mohammed VI Polytech Univ, CAM, Lot 660 Hay Moulay Rachid, Ben Guerir 43150, Morocco..
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2016 (English)In: Journal of Alloys and Compounds, ISSN 0925-8388, E-ISSN 1873-4669, Vol. 689, 233-245 p.Article in journal (Refereed) Published
Abstract [en]

Sr2Zn1-xNixWO6 solid solutions (with 0 <= x <= 1) have been synthesized by solid-state reactions, and characterized by X-Ray diffraction and Raman spectroscopy. The X-Ray powder diffraction (XRD) data at room temperature shows a systematical change of structure vs. nickel content: the compound adopts a monoclinic phase with a P2(1)/n space group with 0 <= x <= 0.18, a tetragonal structure with a I4/m space group with x = 0.25, and a tetragonal structure with a I4/mmm space group with 0.5 <= x <= 1. Further in-situ Raman study at elevated temperature (up to 555 degrees C) shows the pristine monoclinic phase (0 <= x <= 0.18) follows the phase path: monoclinic (P2(1)/n) -> tetragonal (I4/m) -> tetragonal (I4/ mmm) -> cubic (Fm (3) over barm); for the compound Sr2Zn0.75Ni0.25WO6, it involves later two phase transitions as tetragonal (I4/m) -> tetragonal (I4/mmm) -> cubic (Fm (3) over barm); and for the 0.5 <= x <= 1 compounds, only one phase transition I4/mmm to Fm (3) over barm was observed. The combined investigation of composition and temperature provides us a complete understanding of chemical substitution and temperature effect on structural phase transition.

Place, publisher, year, edition, pages
2016. Vol. 689, 233-245 p.
Keyword [en]
Sr2Zn1-xNixWO6 double perovskite, Crystal structure, Phase transitions, X-ray diffraction, Raman spectroscopy
National Category
Materials Chemistry
URN: urn:nbn:se:uu:diva-307257DOI: 10.1016/j.jallcom.2016.07.286ISI: 000384427200033OAI: oai:DiVA.org:uu-307257DiVA: diva2:1046476
Swedish Research Council, 348-2014-4287
Available from: 2016-11-14 Created: 2016-11-11 Last updated: 2016-11-14Bibliographically approved

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