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Sequence of phase t...
Sequence of phase transitions induced by chemical composition and high temperature in [Ba2CaWO6]((1-x))[Sr2CaWO6](x) double perovskite tungsten oxides
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- Mirinioui, F. (författare)
- Univ Hassan 1er, Lab Sci Mat Milieux & Modelisat LS3M, Khouribga 25000, Morocco.
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- Manoun, Bouchaib (författare)
- Univ Hassan 1er, Lab Sci Mat Milieux & Modelisat LS3M, Khouribga 25000, Morocco.
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- Tamraoui, Y. (författare)
- Univ Hassan 1er, Lab Sci Mat Milieux & Modelisat LS3M, Khouribga 25000, Morocco.
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- Lazor, Peter (författare)
- Uppsala universitet,Mineralogi, petrologi och tektonik
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Univ Hassan 1er, Lab Sci Mat Milieux & Modelisat LS3M, Khouribga 25000, Morocco Mineralogi, petrologi och tektonik (creator_code:org_t)
- Elsevier BV, 2015
- 2015
- Engelska.
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Ingår i: Journal of Solid State Chemistry. - : Elsevier BV. - 0022-4596 .- 1095-726X. ; 232, s. 182-192
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- [Ba2CaWO6](1-x)[Sr2CaWO6](x) (0 <= x <= 1) materials were synthesized by the high temperature solid state reaction and firing methods, and characterized using techniques of X-ray diffraction and Raman spectroscopy. The crystal structures were determined by Rietveld refinements on the laboratory X-ray powder diffraction data. As a function of composition, upon increasing the strontium content, the samples exhibit a sequence of three phase transitions: from cubic (Fm (3) over barm) to tetragonal (I4/m) to monoclinic structural phases (I2/m, P2(1)/n). These transitions have been confirmed by Raman studies Fm (3) over barm(x=0) -> I4/m(0.1 <= x <= 0.2) -> I2/m(0.3 <= x <= 0.5) -> P2(1)/n(0.6 <= x <= 1) Furthermore, increasing the temperature for the compositions [Ba2CaWO6](1-x)[Sr2CaWO6](x) (0.1 <= x < 1), manifests the P2(1)/n to I2/m, the I2/m to I4/m and the I4/m to Fm<(3)over bar>m phase transitions. For the compositions (0.1 <= x <= 0.2) the tetragonal to cubic phase transition is well illustrated. For the room temperature I2/m monoclinic compositions, two phase transitions were observed for all the compositions with x ranging from 0.3 to 0.5: from the monoclinic (I2/m) to tetragonal (I4/m), and from I4/m to Fm (3) over barm structures. Finally, for the room temperature P2(1)/n monoclinic compositions, only two phase transitions are observed in the temperature range probed by Raman spectroscopy, the temperature was not high enough to reach the tetragonal-to-cubic phase transition.
Ämnesord
- NATURVETENSKAP -- Kemi -- Oorganisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Inorganic Chemistry (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geokemi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geochemistry (hsv//eng)
Nyckelord
- [Ba2CaWO6]((1-x))[Sr2CaWO6](x) (0 <= x <= 1)
- X-ray diffraction
- Raman spectroscopy
- Crystal structure
- Phase transition
- Earth Science with specialization in Mineral Chemistry, Petrology and Tectonics
- Geovetenskap med inriktning mot mineralogi, petrologi och tektonik
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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