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https://www.ias.ac.in/article/fulltext/boms/045/0031 -
Keywords
Brownmillerites ;single crystals ;floating zone ;X-ray photoelectron spectroscopy. -
Abstract
To the best of our knowledge, we report for the first time the growth of brownmillerite Ca$_2$Fe$_2$O$_5$ (CFO) single crystals under Argon (Ar) only ambience by optical floating zone (OFZ) technique and compare its structural andspectroscopic properties with CFO single crystals grown by OFZ method under air and oxygen (O$_2$) atmospheres. Singlecrystal X-ray diffraction confirms growth of Ca$_2$Fe$_2$O$_5$ single crystals in all the atmospheres. Crystals grown in air andoxygen (O$_2$) atmospheres show both metallic Fe$^0$ and Fe$^{3+}$states, whereas in Ar-grown crystals only Fe$^{3+}$ oxidation state is observed. An enhancement in oxygen vacancies is also observed in Ar-grown crystals. Growth ambience is found tohave a strong influence on cationic environment and binding energy of constituent elements, as is evident from the X-ray photoelectron spectroscopy of the Ca$_2$Fe$_2$O$_5$ crystals.
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Graphical Abstract
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Author Affiliations
SUCHITA DHANKHAR1 DURGA SANKAR VAVILAPALLI1 GOPAL BHALERAO2 S GANESAMOORTHY3 4 SHAMIMA HUSSAIN2 K BASKAR1 SHUBRA SINGH1
- Crystal Growth Centre, Anna University, Chennai 600025, India
- UGC-DAE CSR Kalpakkam Node, Kalpakkam 603104, India
- Low Temperature Studies and Crystal Growth Section, Condensed Matter Physics Division, Material Science Group, IGCAR, Kalpakkam 603102, India
- Homi Bhabha National Institute, Training School Complex, Mumbai 400 094, India
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Dates
- Published
- 8 February 2022
- Manuscript received
- 28 May 2021
- Accepted
- 6 October 2021
- Final version published online
- 8 February 2022
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Bulletin of Materials Science
Volume 46, 2023
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