Synthesis, Crystal Structure and Magnetic Properties of Y3–xCex(Fe0.5Ga0.5)5O12 (х = 0, 0.5)

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Resumo

The specific magnetisation and magnetic susceptibility of ferrogranates of the composition Y3–xCex(Fe0.5Ga0.5)5O12 (x = 0, 0.5) obtained by the gel combustion method have been measured. It was found that after synthesis and subsequent crystallisation at pressure ≈ 10–2 Pa at 1023 K for 2 h, the temperature of magnetic phase transformation in the studied compositions Y3–xCex(Fe0.5Ga0.5)5O12 increases with the replacement of yttrium ions Y3+ by Ce3+. Partial substitution of iron ions in the ferrogranate lattice by gallium leads to the appearance of antiferromagnetic ordering with sufficiently high Curie-Weiss temperature Θef.

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Sobre autores

Е. Romanova

Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences

Email: ketsko@igic.ras.ru
Rússia, Moscow

M. Smirnova

Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences

Email: ketsko@igic.ras.ru
Rússia, Moscow

G. Nikiforova

Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences

Email: ketsko@igic.ras.ru
Rússia, Moscow

V. Ketsko

Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences

Autor responsável pela correspondência
Email: ketsko@igic.ras.ru
Rússia, Moscow

K. Yanushkevich

Scientific and Practical Center for Materials Science of the National Academy of Sciences of Belarus

Email: ketsko@igic.ras.ru
Belarus, Minsk

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2. Fig. 1. Diffractograms Of Y3(Fe0.5Ga0.5)5O12 after synthesis and annealing in air at 1023 K(1) and Y2.5Ce0.5(Fe0.5Ga0.5)5O12 after synthesis and annealing in vacuum (2) and subsequent annealing in air at 1023 K (3)

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3. Fig. 2. REM image of Y3(Fe0.5Ga0.5)5O12 after synthesis and annealing in air at 1023 K

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4. Fig. 3. REM image Y2.5Ce0.5(Fe0.5Ga0.5)5O12 after synthesis and annealing in vacuum (a) and subsequent annealing in air (b)

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5. Fig. 4. Temperature dependence of the specific magnetization and magnetic susceptibility (insert) of ferrogranate Y3(Fe0.5Ga0.5)5O12

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6. Fig. 5. Temperature dependence of specific magnetization (σ, σ2) and magnetic susceptibility (10-2/χ) Y2.5Ce0.5Fe2.5Ga0.5O12 after synthesis and annealing at 1073 K in vacuum

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7. Fig. 6. Temperature dependence of specific magnetization (σ, σ2) and magnetic susceptibility (10-2/χ) Y2.5Ce0.5Fe2.5Ga0.5O12 after synthesis, annealing at 1073 K in vacuum and isothermal exposure at 1073 K for 5 h

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