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Temperature induced...
Temperature induced structural phase transition in Sr3-xCaxFe2TeO9 (0 <= x <= 1) probed by Raman and Mossbauer techniques
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- El Hachmi, Abdelhadi (författare)
- Univ Hassan 1er, LS3M, FP Khouribga, Khouribga, Morocco.
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- Manoun, Bouchaib (författare)
- Univ Hassan 1er, LS3M, FP Khouribga, Khouribga, Morocco.;Mohammed VI Polytech Univ, Mat Sci & Nanoengn Dept, Ben Guerir, Morocco.
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- Tamraoui, Y. (författare)
- Univ Hassan 1er, LS3M, FP Khouribga, Khouribga, Morocco.;Mohammed VI Polytech Univ, Mat Sci & Nanoengn Dept, Ben Guerir, Morocco.
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- Mirinioui, F. (författare)
- Univ Hassan 1er, LS3M, FP Khouribga, Khouribga, Morocco.
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- Abkar, R. (författare)
- Univ Hassan 1er, LS3M, FP Khouribga, Khouribga, Morocco.
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- El Aamrani, M. A. (författare)
- Univ Hassan 1er, LS3M, FP Khouribga, Khouribga, Morocco.
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- Saadoune, I. (författare)
- Mohammed VI Polytech Univ, Mat Sci & Nanoengn Dept, Ben Guerir, Morocco.;Univ Cadi Ayyad, FST Marrakech, LCME, Av A Khattabi, Marrakech 40000, Morocco.
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- Sajieddine, M. (författare)
- Univ Sultan Moulay Sliman, Lab Phys & Mech Mat, Fac Sci & Tech, BP 523, Beni Mellal 23000, Morocco.
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- Lazor, Peter (författare)
- Uppsala universitet,Mineralogi, petrologi och tektonik
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Univ Hassan 1er, LS3M, FP Khouribga, Khouribga, Morocco Univ Hassan 1er, LS3M, FP Khouribga, Khouribga, Morocco.;Mohammed VI Polytech Univ, Mat Sci & Nanoengn Dept, Ben Guerir, Morocco. (creator_code:org_t)
- Elsevier BV, 2017
- 2017
- Engelska.
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Ingår i: Journal of Molecular Structure. - : Elsevier BV. - 0022-2860 .- 1872-8014. ; 1141, s. 484-494
- 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
- A series of perovskites Sr3-xCaxFe2TeO9 (0 <= x <= 1) have been prepared in polycrystalline form by solid-state reaction method in air. These materials have been studied by X-ray powder diffraction method (XRPD) and Raman spectroscopy. An analysis of the XRD patterns at room temperature has shown that these compounds crystallize in a tetragonal system, space group I4/m. The structure contains alternating (Fe/Te)(2a)O-6 and (Fe/Te)(2b)O-6 octahedra, tilted in anti-phase in the basal ab-plane. The study of Raman spectroscopy at various temperatures shows a transition from tetragonal to cubic phase: I4/m -> Fm (3) over bar m. This phase transition occurs at high-temperature. Analysis of Raman spectra recorded at several temperatures shows that this phase transition appears near similar to 375 degrees C for (x = 0), similar to 435 degrees C for (x = 0.5) and similar to 451 degrees C for (x = 1). A proportional and gradual increase of temperature phase transition is observed as function of the calcium amount.
Ämnesord
- NATURVETENSKAP -- Kemi -- Oorganisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Inorganic Chemistry (hsv//eng)
Nyckelord
- Double perovskite
- Crystal structure
- Phase transition
- X-ray diffraction
- Raman spectroscopy
- Mossbauer spectroscopy
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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