Simulations of equilibrium magnetic and magnetoelastic properties of non-conducting rare-earth compounds

© Kazan Federal University (KFU).The Hamiltonian of the magnetic subsystem containing rare-earth ions involves energies of the localized 4f-electrons in free ions, energies of interactions of the 4f-electrons with the static crystal field in the perfect crystal lattice as well as in the homogeneously deformed lattice, interactions with the external magnetic field and lattice vibrations (electron-phonon interaction), magnetic dipolar and exchange interactions between the ions. This Hamiltonian is used in calculations of different measurable physical parameters versus temperature and the magnetic field strength and direction (energy levels of rare earth ions, the magnetization, magnetic dc- and ac-susceptibilities, elastic constants, lattice deformations)

IMPROVING THE SYSTEM OF CONTROL AND SUPERVISION OF CUSTOMS IN THE REGION

Customs regulation as a type of management activity of customs authorities is one of the key elements of the customs system and the economy of the state. The control and supervision activities of the customs authorities should be carried out on a systematic basis, and the key goal of this type of work is to improve customs regulation for increasing the efficiency of the customs system and optimize the activities of customs authorities. The problems and ways to improve the system of control and supervision in the field of customs in the region (on the example of the Ural Customs Administration) have been analyzed in the article. The main practical research methods are the analysis of statistical data and regulatory sources, a sociological study using the expert survey method (n = 13). As a result, a systematization of problematic aspects of the control and supervision in the field of customs has been proposed; a system of measures has been developed aimed at improving the quality of control and supervision in the field of customs

Magnetic properties of powders LiTbF<inf>4</inf> and TbF<inf>3</inf>

© Kazan Federal University (KFU).Samples LiTbF4and TbF3were synthesized by modified methods of colloidal chemistry. The magnetization of these samples was measured in the external magnetic field at 100 Oe and 1T and in temperature range 2-300 K. Temperatures of phase transition to the magnetic ordering dipolar ferromagnet state were determined for synthesized samples

Microwave-Assisted Hydrothermal Synthesis and Annealing of DyF 3

The series of DyF3 nanosized samples was synthesized by the colloidal chemistry method. The microwave-assisted hydrothermal treatment was used for the first time for the modification of DyF3 nanoparticles. Transmission electron microscopy images show that the DyF3 nanoparticles have average particle size of about 16–18 nm and the size distribution becomes narrower during the microwave irradiation. The X-ray diffraction analysis shows the narrowing of the diffraction peaks versus microwave treatment time. The experimental data demonstrates restructuring of the nanoparticles and their crystal structure becomes closer to the ideal DyF3 regular structure during the microwave irradiation of colloidal solution. The defect-annealing model of the microwave-assisted hydrothermal modification process is suggested

Microwave-Assisted Hydrothermal Synthesis and Annealing of DyF<inf>3</inf> Nanoparticles

© 2016 E. M. Alakshin et al.The series of DyF3 nanosized samples was synthesized by the colloidal chemistry method. The microwave-assisted hydrothermal treatment was used for the first time for the modification of DyF3 nanoparticles. Transmission electron microscopy images show that the DyF3 nanoparticles have average particle size of about 16-18 nm and the size distribution becomes narrower during the microwave irradiation. The X-ray diffraction analysis shows the narrowing of the diffraction peaks versus microwave treatment time. The experimental data demonstrates restructuring of the nanoparticles and their crystal structure becomes closer to the ideal DyF3 regular structure during the microwave irradiation of colloidal solution. The defect-annealing model of the microwave-assisted hydrothermal modification process is suggested

Simulations of equilibrium magnetic and magnetoelastic properties of non-conducting rare-earth compounds

© Kazan Federal University (KFU).The Hamiltonian of the magnetic subsystem containing rare-earth ions involves energies of the localized 4f-electrons in free ions, energies of interactions of the 4f-electrons with the static crystal field in the perfect crystal lattice as well as in the homogeneously deformed lattice, interactions with the external magnetic field and lattice vibrations (electron-phonon interaction), magnetic dipolar and exchange interactions between the ions. This Hamiltonian is used in calculations of different measurable physical parameters versus temperature and the magnetic field strength and direction (energy levels of rare earth ions, the magnetization, magnetic dc- and ac-susceptibilities, elastic constants, lattice deformations)

Simulations of equilibrium magnetic and magnetoelastic properties of non-conducting rare-earth compounds

© Kazan Federal University (KFU).The Hamiltonian of the magnetic subsystem containing rare-earth ions involves energies of the localized 4f-electrons in free ions, energies of interactions of the 4f-electrons with the static crystal field in the perfect crystal lattice as well as in the homogeneously deformed lattice, interactions with the external magnetic field and lattice vibrations (electron-phonon interaction), magnetic dipolar and exchange interactions between the ions. This Hamiltonian is used in calculations of different measurable physical parameters versus temperature and the magnetic field strength and direction (energy levels of rare earth ions, the magnetization, magnetic dc- and ac-susceptibilities, elastic constants, lattice deformations)

Simulations of equilibrium magnetic and magnetoelastic properties of non-conducting rare-earth compounds

© Kazan Federal University (KFU).The Hamiltonian of the magnetic subsystem containing rare-earth ions involves energies of the localized 4f-electrons in free ions, energies of interactions of the 4f-electrons with the static crystal field in the perfect crystal lattice as well as in the homogeneously deformed lattice, interactions with the external magnetic field and lattice vibrations (electron-phonon interaction), magnetic dipolar and exchange interactions between the ions. This Hamiltonian is used in calculations of different measurable physical parameters versus temperature and the magnetic field strength and direction (energy levels of rare earth ions, the magnetization, magnetic dc- and ac-susceptibilities, elastic constants, lattice deformations)

Magnetic properties of powders LiTbF<inf>4</inf> and TbF<inf>3</inf>

© Kazan Federal University (KFU).Samples LiTbF4and TbF3were synthesized by modified methods of colloidal chemistry. The magnetization of these samples was measured in the external magnetic field at 100 Oe and 1T and in temperature range 2-300 K. Temperatures of phase transition to the magnetic ordering dipolar ferromagnet state were determined for synthesized samples

Magnetic properties of powders LiTbF<inf>4</inf> and TbF<inf>3</inf>

© Kazan Federal University (KFU).Samples LiTbF4and TbF3were synthesized by modified methods of colloidal chemistry. The magnetization of these samples was measured in the external magnetic field at 100 Oe and 1T and in temperature range 2-300 K. Temperatures of phase transition to the magnetic ordering dipolar ferromagnet state were determined for synthesized samples