Mössbauer and Optical Investigations on Sr Doped M-Type BaFe12O19 Hexaferrites Produced via Autocombustion

Costa, Benilde F. O.; Benali, Adel; Vieira, Bruno J. C.; Waerenborgh, João C.; Pina, João; Marouani, Yousra; Dhahri, Essebti

doi:10.3390/cryst15040291

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Mössbauer and Optical Investigations on Sr Doped M-Type BaFe₁₂O₁₉ Hexaferrites Produced via Autocombustion

by

Benilde F. O. Costa

^1,*

,

Adel Benali

^1,2

,

Bruno J. C. Vieira

³

,

João C. Waerenborgh

³

,

João Pina

⁴,

Yousra Marouani

^1,2 and

Essebti Dhahri

²

¹

University of Coimbra, CFisUC, Physics Department, 3400-516 Coimbra, Portugal

²

Laboratoire de Physique Appliquée, Faculté des Sciences de Sfax, Université de Sfax, P.O. Box 1171, Sfax 3000, Tunisia

³

Centro de Ciências e Tecnologias Nucleares, DECN, Instituto Superior Técnico, Universidade de Lisboa, 2695-066 Bobadela, Portugal

⁴

University of Coimbra, CQC-IMS, Department of Chemistry, 3004-535 Coimbra, Portugal

^*

Author to whom correspondence should be addressed.

Crystals 2025, 15(4), 291; https://doi.org/10.3390/cryst15040291

Submission received: 5 March 2025 / Revised: 12 March 2025 / Accepted: 21 March 2025 / Published: 24 March 2025

(This article belongs to the Special Issue Metal Oxides: Crystal Structure, Synthesis and Characterization (2nd Edition))

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Abstract

Ba_1−xSr_xFe₁₂O₁₉ (x = 0.0, 0.5 and 1.0) hard-magnetic nanohexaferrites prepared by autocombustion were primarily investigated using Mössbauer spectroscopy and optical studies. Morphological examination by electron scanning microscopy revealed that the particles agglomerated into grains with a hexagonal shape. The grain size increases with the amount of Sr content, from ca. 490 nm (x = 0.0) to ca. 700 nm (x = 1.0). Room-temperature Mössbauer spectroscopy showed that the mean hyperfine field increased with the substitution of Ba²⁺ by Sr²⁺, consistent with magnetization results. The preferential sites occupied by Fe ions in the hexaferrite structure were determined. Optical studies revealed that all compounds absorb up to ca. 1000 nm, and that the bandgap energy decreases with increasing Sr content.

Keywords: M-type hexaferrites; hyperfine interactions; cation distribution; band gap energy

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MDPI and ACS Style

Costa, B.F.O.; Benali, A.; Vieira, B.J.C.; Waerenborgh, J.C.; Pina, J.; Marouani, Y.; Dhahri, E. Mössbauer and Optical Investigations on Sr Doped M-Type BaFe₁₂O₁₉ Hexaferrites Produced via Autocombustion. Crystals 2025, 15, 291. https://doi.org/10.3390/cryst15040291

AMA Style

Costa BFO, Benali A, Vieira BJC, Waerenborgh JC, Pina J, Marouani Y, Dhahri E. Mössbauer and Optical Investigations on Sr Doped M-Type BaFe₁₂O₁₉ Hexaferrites Produced via Autocombustion. Crystals. 2025; 15(4):291. https://doi.org/10.3390/cryst15040291

Chicago/Turabian Style

Costa, Benilde F. O., Adel Benali, Bruno J. C. Vieira, João C. Waerenborgh, João Pina, Yousra Marouani, and Essebti Dhahri. 2025. "Mössbauer and Optical Investigations on Sr Doped M-Type BaFe₁₂O₁₉ Hexaferrites Produced via Autocombustion" Crystals 15, no. 4: 291. https://doi.org/10.3390/cryst15040291

APA Style

Costa, B. F. O., Benali, A., Vieira, B. J. C., Waerenborgh, J. C., Pina, J., Marouani, Y., & Dhahri, E. (2025). Mössbauer and Optical Investigations on Sr Doped M-Type BaFe₁₂O₁₉ Hexaferrites Produced via Autocombustion. Crystals, 15(4), 291. https://doi.org/10.3390/cryst15040291

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Mössbauer and Optical Investigations on Sr Doped M-Type BaFe₁₂O₁₉ Hexaferrites Produced via Autocombustion

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