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Serga V, Burve R, Maiorov M, Krumina A, Skaudžius R, Zarkov A, Kareiva A, Popov AI. Impact of Gadolinium on the Structure and Magnetic Properties of Nanocrystalline Powders of Iron Oxides Produced by the Extraction-Pyrolytic Method. MATERIALS 2020; 13:ma13184147. [PMID: 32957733 PMCID: PMC7560244 DOI: 10.3390/ma13184147] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/02/2020] [Revised: 09/15/2020] [Accepted: 09/16/2020] [Indexed: 11/25/2022]
Abstract
Interest in magnetic nanoparticles is primarily due to their practical use. In this work, for the production of nanocrystalline powders of pure and gadolinium doped iron oxides, the extraction-pyrolytic method (EPM) was used. As a precursor, either iron-containing extract (iron (III) caproate in caproic acid) or its mixture with gadolinium-containing extract (gadolinium (III) valerate in valeric acid) was used. The mixed precursor contained 0.5 mol %, 2.5 mol %, 12.5 mol %, 50 mol %, and 75 mol % gadolinium in relation to the iron content. The formation of iron oxide phases, depending on the preparation conditions, was investigated. According to the results obtained, it was demonstrated that the presence of more than 2.5 mol % gadolinium additive in the mixed precursor inhibits the magnetite-to-hematite transformation process during thermal treatment. Produced samples were characterized by XRD and SEM methods, and the magnetic properties were studied.
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Affiliation(s)
- Vera Serga
- Institute of Solid State Physics, University of Latvia, Kengaraga 8, LV-1063 Riga, Latvia; (V.S.); (R.B.); (A.I.P.)
- Institute of Inorganic Chemistry, Riga Technical University, P. Valdena 3/7, LV-1048 Riga, Latvia;
| | - Regina Burve
- Institute of Solid State Physics, University of Latvia, Kengaraga 8, LV-1063 Riga, Latvia; (V.S.); (R.B.); (A.I.P.)
- Institute of Inorganic Chemistry, Riga Technical University, P. Valdena 3/7, LV-1048 Riga, Latvia;
| | - Mikhail Maiorov
- Institute of Physics, University of Latvia, Miera 32, LV-2169 Salaspils, Latvia;
| | - Aija Krumina
- Institute of Inorganic Chemistry, Riga Technical University, P. Valdena 3/7, LV-1048 Riga, Latvia;
| | - Ramūnas Skaudžius
- Institute of Chemistry, Vilnius University, Naugarduko st. 24, LT-03225 Vilnius, Lithuania; (R.S.); (A.Z.)
| | - Aleksej Zarkov
- Institute of Chemistry, Vilnius University, Naugarduko st. 24, LT-03225 Vilnius, Lithuania; (R.S.); (A.Z.)
| | - Aivaras Kareiva
- Institute of Chemistry, Vilnius University, Naugarduko st. 24, LT-03225 Vilnius, Lithuania; (R.S.); (A.Z.)
- Correspondence:
| | - Anatoli I. Popov
- Institute of Solid State Physics, University of Latvia, Kengaraga 8, LV-1063 Riga, Latvia; (V.S.); (R.B.); (A.I.P.)
- Institute of Physics, University of Tartu, W. Ostwald Str. 1, 50411 Tartu, Estonia
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