Influence of the Structure on Magnetic Properties of Calcium-Phosphate Systems Doped with Iron and Vanadium Ions
The aim of this study was to prepare and characterize the glasses made of x(Fe<sub>2</sub>O<sub>3</sub>∙V<sub>2</sub>O<sub>5</sub>)∙(100 − x)[P<sub>2</sub>O<sub>5</sub>∙CaO] with x ranging of 0–50%. The contribution of Fe<sub...
| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2023-04-01
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| Series: | International Journal of Molecular Sciences |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1422-0067/24/8/7366 |
| Summary: | The aim of this study was to prepare and characterize the glasses made of x(Fe<sub>2</sub>O<sub>3</sub>∙V<sub>2</sub>O<sub>5</sub>)∙(100 − x)[P<sub>2</sub>O<sub>5</sub>∙CaO] with x ranging of 0–50%. The contribution of Fe<sub>2</sub>O<sub>3</sub> and V<sub>2</sub>O<sub>5</sub> amount on the structure of P<sub>2</sub>O<sub>5</sub>·CaO matrix was investigated. The vitreous materials were characterized by XRD (X-ray diffraction analysis), EPR (Electron Paramagnetic Resonance) spectroscopy, and magnetic susceptibility measurements. A hyperfine structure typical for isolated V<sup>4+</sup> ions was noticed to all spectra containing low amount of V<sub>2</sub>O<sub>5.</sub> The XRD spectra show the amorphous nature of samples, apart x = 50%. An overlap of the EPR spectrum of a broad line without the hyperfine structure characteristic of clustered ions was observed with increasing V<sub>2</sub>O<sub>5</sub> content. The results of magnetic susceptibility measurements explain the antiferromagnetic or ferromagnetic interactions expressed between the iron and vanadium ions in the investigated glass. |
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| ISSN: | 1661-6596 1422-0067 |