Measurements of Magnetocaloric Effect in LaFe11.14Co0.66Si1.2−xAlxLaFe_{11.14}Co_{0.66}Si_{1.2-x}Al_{x} (x=0.1, 0.2, 0.3) Alloys

In the present work, phase constitution and thermomagnetic properties of $LaFe_{11.14}Co_{0.66}Si_{1.2-x}Al_{x}$ (where x = 0.1, 0.2, 0.3) alloys were investigated. Ingot samples were obtained by arc-melting under the low pressure of Ar atmosphere. Subsequently samples were annealed at 1323 K for 15 days. X-ray diffraction of all samples revealed coexistence of two crystalline phases dominant $La(Fe,Si)_{13}$-type and minor bcc α -Fe. Furthermore, the magnetic measurements at various temperatures allowed to study the Curie temperature, magnetic entropy changes and relative cooling power

Measurements of Magnetocaloric Effect in LaFe 11.14

In the present work, phase constitution and thermomagnetic properties of $LaFe_{11.14}Co_{0.66}Si_{1.2-x}Al_{x}$ (where x = 0.1, 0.2, 0.3) alloys were investigated. Ingot samples were obtained by arc-melting under the low pressure of Ar atmosphere. Subsequently samples were annealed at 1323 K for 15 days. X-ray diffraction of all samples revealed coexistence of two crystalline phases dominant $La(Fe,Si)_{13}$-type and minor bcc α -Fe. Furthermore, the magnetic measurements at various temperatures allowed to study the Curie temperature, magnetic entropy changes and relative cooling power

Phase Structure in Fe-Cr-Co Permanent Magnet Alloy

The Mössbauer spectroscopy, electron microscopy and magnetization measurements were used in order to describe structural changes in Fe$\text{}_{58.75}$Cr$\text{}_{29.4}$Co$\text{}_{11.85}$ alloy during magnetic hardening. Multiphase structure was found in alloy with best magnetic properties

Effect of Ga Addition on Structure and Magnetic Properties of the LaFe11.14Co0.66Si1.2−xGaxLaFe_{11.14}Co_{0.66}Si_{1.2-x}Ga_{x} (x=0.1, 0.2, 0.3) Alloys

In the present work, the phase constitution and magnetic properties of the $LaFe_{11.14}Co_{0.66}Si_{1.2-x}Ga_{x}$ (where x=0.1, 0.2, 0.3) alloys, were investigated. It was revealed that increase of Ga content in the alloy composition causes the rise of lattice parameter of the $La(Fe,Si)_{13}$-type phase, which causes increase of the Curie temperature. However, the increase of Ga addition leads to decrease of magnetocaloric effect

Ordering of alfa-FeCo phase in the nanocrystalline Fe83-xCoxNb3B13Cu1 (x = 6, 25 or 41.5) alloy

The microstructure and ordering of alfa-FeCo phase of the nanocrystalline Fe83 xCoxNb3B13Cu1 (x = 6, 25 or 41.5) alloys were investigated. We have stated that á-FeCo phase is atomically ordered in the Fe83 xCoxNb3B13Cu1 (x = 25 or 41.5) samples crystallized by the heat treatment in a furnace. However, after flash annealing (by current or laser) that phase is disordered. Moreover, we have found that Co concentration in the crystalline alfa-FeCo phase strongly depends on Co content in the as-quenched ribbons. The annealing conditions influence also the grain diameter of the crystalline phase. In the nanocrystalline alloys obtained by a flash annealing of the amorphous ribbons finer grains are present

Effect of Al content on the order of phase transition and magnetic entropy change in LaFe11Co0.8(Si1−xAlx)1.2\mathrm{LaFe_{11}Co_{0.8}(Si_{1-x}Al_{x})_{1.2}} alloys

The comparative studies of the effect of partial substitution of Al by Si on the structure and magnetic entropy change in LaFe$_{11}$Co$_{0.8}$(Si$_{1-x}$Al$_{x}$)$_{1.2}$ alloys produced by arc-melting followed by long time annealing at 1323 K were performed. The X-ray diffraction analysis revealed almost single phase composition of annealed samples. The high intensity synchrotron radiation was used for studying the thermal evolution of lattice constant of the La(Fe,Co,Si)$_{13}$ phase. Furthermore, calculations of temperature dependences of Landau coefficients were used to reveal changes in the character of phase transformation at around the Curie temperature