Study of hyperfine interactions in spinel cobalt ferrite CoFe2O4 doped with Hf, Lu, and Yb using Mössbauer spectroscopy and perturbed γ-γ angular correlation

Viktor M. Vakhtel; Atanas I. Velichkov; Dimitar V. Karaivanov; Maria M. Milanova; Yuri G. Segal; Nargiza Temerbulatova; Dmitry V. Filosofov; Martin P. Tsvetkov

doi:10.17308/kcmf.2025.27/12486

Viktor M. Vakhtel Voronezh State University, 1 Universitetskaya pl., Voronezh 394018, Russian Federation
Atanas I. Velichkov Joint Institute for Nuclear Research, 6 Joliot-Curie st., Dubna 141980, Moscow Region, Russian Federation; Institute for Nuclear Research and Nuclear Energy of the Bulgarian Academy of Sciences, 72 72 Blvd. “Tsarigradsko Shose”, Sofia 1784, Bulgaria
Dimitar V. Karaivanov Joint Institute for Nuclear Research, 6 Joliot-Curie st., Dubna 141980, Moscow Region, Russian Federation; Institute for Nuclear Research and Nuclear Energy of the Bulgarian Academy of Sciences, 72 72 Blvd. “Tsarigradsko Shose”, Sofia 1784, Bulgaria
Maria M. Milanova Sofia University “St. Kliment Ohridski”, 15 Tzar Osvoboditel Blvd., Sofia 1504, Bulgaria
Yuri G. Segal Voronezh State University, 1 Universitetskaya pl., Voronezh 394018, Russian Federation
Nargiza Temerbulatova Joint Institute for Nuclear Research, 6 Joliot-Curie st., Dubna 141980, Moscow Region, Russian Federation; Institute of Nuclear Physics, 1 Ibragimov st., Almaty 050032, the Republic of Kazakhstan
Dmitry V. Filosofov Joint Institute for Nuclear Research, 6 Joliot-Curie st., Dubna 141980, Moscow Region, Russian Federation
Martin P. Tsvetkov Sofia University “St. Kliment Ohridski”, 15 Tzar Osvoboditel Blvd., Sofia 1504, Bulgaria

DOI: https://doi.org/10.17308/kcmf.2025.27/12486

Keywords: Mössbauer spectroscopy, Perturbed correlations, Spinels, Oxides, Ferrites

Abstract

We studied hyperfine interactions (HFI) in spinel cobalt ferrite (ferrospinel) CoFe₂O₄ doped with Lu, Yb, and Hf (1 wt. %) by Mössbauer spectroscopy (MS) on ⁵⁷Fe nuclei. The interactions indicate the presence (CoFe₂O₄:Lu – 11 %, CoFe₂O₄:Yb – 23.4%) and the absence (CoFe₂O₄:Hf) of additional phases. The study revealed a significant change in the HFI parameters on ⁵⁷Fe nuclei in the octahedral sites in ferrospinels doped with Hf, Lu, and Yb. However, the relative influence of the impurity on ⁵⁷Fe nuclei in the tetrahedral sites was insignificant.

The parameters of hyperfine fields on ¹⁷²Yb nuclei in cobalt ferrite were obtained by the method of perturbed γ-γ angular correlations (PAC). The ¹⁷²Yb ions were introduced into the sample using two methods: by adding ¹⁷²Hf and ¹⁷²Lu isotopes. A significant difference in the HFI parameters for these two cases was revealed. The local environment of ¹⁷²Yb ions appears to be different in the two variants of isotope introduction into the sample (Hf or Lu). The difference in the HFI parameters persisted in the temperature range of 300 - 1000 K.

It was determined that the different effects of Hf and Lu on the parameters (electric field gradient, magnetic field, and isomer shift) of the HFI in the sample are revealed by both MS and PAC methods, irrespective of the amount of the dopant. According to the MS data, Hf and Lu do not lead to significant changes in the HFI parameters in the tetrahedral sites (“Sextet 1”), but have a significantly different effect on the same parameters in the octahedral sites (“Sextet 2”). A similar pattern was observed using the PAC method: replacing Hf with Lu did not reveal any changes in the HFI parameters in one of the sites (the octahedral site), but indicated a significant change in the other site

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Author Biographies

Viktor M. Vakhtel, Voronezh State University, 1 Universitetskaya pl., Voronezh 394018, Russian Federation

Cand. Sci. (Phys.–Math.), Associate Professor, Department of Nuclear Physics, Voronezh State University (Voronezh, Russian Federation)

Atanas I. Velichkov, Joint Institute for Nuclear Research, 6 Joliot-Curie st., Dubna 141980, Moscow Region, Russian Federation; Institute for Nuclear Research and Nuclear Energy of the Bulgarian Academy of Sciences, 72 72 Blvd. “Tsarigradsko Shose”, Sofia 1784, Bulgaria

Cand. Sci. (Phys.–Math.), Senior Researcher, Sector No. 4 of Radiochemistry, Scientific and Experimental Department of Nuclear Spectroscopy and Radiochemistry, Joint Institute for Nuclear Research (Dubna,
Moscow Region, Russian Federation)

Dimitar V. Karaivanov, Joint Institute for Nuclear Research, 6 Joliot-Curie st., Dubna 141980, Moscow Region, Russian Federation; Institute for Nuclear Research and Nuclear Energy of the Bulgarian Academy of Sciences, 72 72 Blvd. “Tsarigradsko Shose”, Sofia 1784, Bulgaria

Cand. Sci. (Phys.–Math.), Senior Researcher, Sector No. 4 of Radiochemistry, Scientific and Experimental Department of Nuclear Spectroscopy and Radiochemistry, Joint Institute for Nuclear Research (Dubna,
Moscow Region, Russian Federation)

Maria M. Milanova, Sofia University “St. Kliment Ohridski”, 15 Tzar Osvoboditel Blvd., Sofia 1504, Bulgaria

Dr. Sci., Professor, Department of Inorganic Chemistry, Faculty of Chemistry and Pharmacy, Sofia University “St. Kliment Ohridski” (Sofia, Bulgaria)

Yuri G. Segal, Voronezh State University, 1 Universitetskaya pl., Voronezh 394018, Russian Federation

Head of the Laboratory of Nuclear Spectrometry, Department of Nuclear Physics, Voronezh State University (Voronezh, Russian Federation)

Nargiza Temerbulatova, Joint Institute for Nuclear Research, 6 Joliot-Curie st., Dubna 141980, Moscow Region, Russian Federation; Institute of Nuclear Physics, 1 Ibragimov st., Almaty 050032, the Republic of Kazakhstan

Junior Researcher, Sector No. 4 of Radiochemistry, Scientific and Experimental Department of Nuclear Spectroscopy and Radiochemistry, Joint Institute for Nuclear Research (Dubna, Moscow Region, Russian
Federation)

Dmitry V. Filosofov, Joint Institute for Nuclear Research, 6 Joliot-Curie st., Dubna 141980, Moscow Region, Russian Federation

Cand. Sci. (Chem.), Head of Sector No. 4 of Radiochemistry, Scientific and Experimental Department of Nuclear Spectroscopy and Radiochemistry, Joint Institute for Nuclear Research (Dubna, Moscow Region, Russian Federation)

Martin P. Tsvetkov, Sofia University “St. Kliment Ohridski”, 15 Tzar Osvoboditel Blvd., Sofia 1504, Bulgaria

Dr. Sci., Associate Professor, Department of Inorganic Chemistry, Faculty of Chemistry and Pharmacy, Sofia University “St. Kliment Ohridski” (Sofia, Bulgaria)

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