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On the structural phase transitions and optical properties of Sr2Sr1-xCaxTeO6 (0 ≤ x ≤ 1) ceramics

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Abstract

A series of double-perovskite oxides Sr2Sr1-xCaxTeO6 (0 ≤ x ≤ 1) samples have been prepared in order to study the effect of composition on phase formation and the related optical properties. The objective of this work is to study the possibility of calcium insertion with different percentages since calcium in known to enhance the electrical properties. In this work a well detailed structure and phase transitions investigation of the compounds were conducted and probed by X-ray diffraction and Raman spectroscopy techniques at room temperature. Both Rietveld refinements and Raman studies revealed that two phase transitions took place as the calcium amount x increases; a first from a triclinic to a hexagonal in the range 0.1 < x < 0.25 and a second from the hexagonal to a monoclinic structure in the range 0.5 < x < 0.6. The optical absorption α(λ) was also determined as a function of calcium content in the series samples using UV-vis analysis. It was revealed that a remarkable change occured in the cut-off wavelength, confirming the sequence of phase transitions C1 → R\( \overline{3} \)m → P21/n. The optical band gap measurements showed that the triclinic Sr3TeO6 and the monoclinic Sr2CaTeO6 phases have band gap values of 2.75 and 2.81 eV, respectively. When the calcium increased to x = 0.25 (Sr2.75Ca0.25TeO6), remarkable decrease of the band gap value was observed, with Eg = 2.627 eV.

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Acknowledgements

The authors are grateful to the University Hassan 1st for its support, the Office Chérifien des Phosphates in the Moroccan Kingdom (OCP group) and Mohammed VI Polytechnic University for their support as well as the Swedish Research Council for the financial grant SRL(MENA) # 348- 2014-4287.

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Authors and Affiliations

  1. Materials Science, Energy, and Nano-engineering Department (MSN), Mohammed VI Polytechnic University, Lot 660 Hay Moulay Rachid, 43150, Ben Guerir, Morocco

    Y. Tamraoui, F. El Bachraoui, J. Alami, I. Saadoune & B. Manoun

  2. Laboratoire Rayonnement-matière et Instrumentation, Univ Hassan 1er, S3M, FST, Settat, Morocco

    F. El Bachraoui, F. Mirinioui, S. Louihi, A. El hachmi & B. Manoun

  3. LCME, FST Marrakech, University Cadi Ayyad, Av. A. Khattabi, 40000, Marrakech, Morocco

    I. Saadoune

  4. Department of Earth Sciences, Uppsala University, SE-752 36, Uppsala, Sweden

    P. Lazor

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  1. Y. Tamraoui
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Correspondence to Y. Tamraoui.

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Tamraoui, Y., El Bachraoui, F., Mirinioui, F. et al. On the structural phase transitions and optical properties of Sr2Sr1-xCaxTeO6 (0 ≤ x ≤ 1) ceramics. J Electroceram 46, 1–13 (2021). https://doi.org/10.1007/s10832-021-00237-8

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