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Growth of brownmillerite Ca2Fe2O5 single crystals under air, oxygen and argon atmospheres using optical floating zone technique: a comparative study

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Abstract

To the best of our knowledge, we report for the first time the growth of brownmillerite Ca2Fe2O5 (CFO) single crystals under Argon (Ar) only ambience by optical floating zone (OFZ) technique and compare its structural and spectroscopic properties with CFO single crystals grown by OFZ method under air and oxygen (O2) atmospheres. Single-crystal X-ray diffraction confirms growth of Ca2Fe2O5 single crystals in all the atmospheres. Crystals grown in air and oxygen (O2) atmospheres show both metallic Fe0 and Fe3+states, whereas in Ar-grown crystals only Fe3+ oxidation state is observed. An enhancement in oxygen vacancies is also observed in Ar-grown crystals. Growth ambience is found to have a strong influence on cationic environment and binding energy of constituent elements, as is evident from the X-ray photoelectron spectroscopy of the Ca2Fe2O5 crystals.

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Acknowledgements

Suchita would like to acknowledge the UGC-DAE CSR long-term proposal (Ref:CSR-KN/CRS-58/2014-15/498) for the fellowship. Durga Sankar acknowledges the UGC for Senior Research Fellowship, Shubra Singh would like to acknowledge the UGC-FRP scheme, SERB. We would also like to acknowledge Dr A Thamizhavel, Department of Condensed Matter Physics and Materials Science Centre, TIFR, Mumbai, for Laue diffraction studies.

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Authors and Affiliations

  1. Crystal Growth Centre, Anna University, Chennai, 600025, India

    Suchita Dhankhar, Durga Sankar Vavilapalli, K Baskar & Shubra Singh

  2. UGC-DAE CSR Kalpakkam Node, Kalpakkam, 603104, India

    Gopal Bhalerao & Shamima Hussain

  3. Low Temperature Studies and Crystal Growth Section, Condensed Matter Physics Division, Material Science Group, IGCAR, Kalpakkam, 603102, India

    S Ganesamoorthy

  4. Homi Bhabha National Institute, Training School Complex, Mumbai, 400 094, India

    S Ganesamoorthy

Authors
  1. Suchita Dhankhar
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  2. Durga Sankar Vavilapalli
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  3. Gopal Bhalerao
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  4. S Ganesamoorthy
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  5. Shamima Hussain
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  6. K Baskar
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  7. Shubra Singh
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Correspondence to Shubra Singh.

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Dhankhar, S., Vavilapalli, D.S., Bhalerao, G. et al. Growth of brownmillerite Ca2Fe2O5 single crystals under air, oxygen and argon atmospheres using optical floating zone technique: a comparative study. Bull Mater Sci 45, 31 (2022). https://doi.org/10.1007/s12034-021-02609-w

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  • DOI: https://doi.org/10.1007/s12034-021-02609-w

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