| Autor: |
Alakshin E; Kazan Federal University, Institute of Physics, 420008, Kremlevskaya 18, Kazan, Russian Federation.; Tatarstan Academy of Science, 420111, Bauman str. 20, Kazan, Russian Federation., Kondratyeva E; Kazan Federal University, Institute of Physics, 420008, Kremlevskaya 18, Kazan, Russian Federation.; Tatarstan Academy of Science, 420111, Bauman str. 20, Kazan, Russian Federation., Garaeva A; Kazan Federal University, Institute of Physics, 420008, Kremlevskaya 18, Kazan, Russian Federation., Sakhatskii A; Saint Petersburg State University, 199034, 7/9 Universitetskaya nab., Saint Petersburg, Russia., Likholetova M; Saint Petersburg State University, 199034, 7/9 Universitetskaya nab., Saint Petersburg, Russia., Romanova I; Kazan Federal University, Institute of Physics, 420008, Kremlevskaya 18, Kazan, Russian Federation., Tagirov M; Kazan Federal University, Institute of Physics, 420008, Kremlevskaya 18, Kazan, Russian Federation.; Tatarstan Academy of Science, 420111, Bauman str. 20, Kazan, Russian Federation. |
| Abstrakt: |
A series of DyF 3 nanoparticles samples were synthesized by a hydrothermal treatment in an autoclave at 140 °C, 160 °C, 200 °C, and 230 °C for 24 h. The samples were characterized by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), and temperature dependence of magnetic susceptibility. It was found that DyF 3 particles possessed an ellipsoidal shape and size varying from 16 to 225 nm. Moroever, the Curie temperature T C shifts to lower temperatures when the particle size decreases. For the first ime, the critical exponent of the correlation length ( ν = 1.51 ± 0.25) and critical size ( d 0 = 1.2 ± 0.6 nm) for the dipole ferromagnet DyF 3 has been determined experimentally by the finite-size-scaling theory. |
