The atomic diffusion in the FeAl intermetallic compound with B2 ordered structure were studied by the kinetic Monte Carlo method. We use the pair interactions up to second neighbors with periodic boundary conditions to avoid surface effects. Diffusion constants was determined as a function of temperature, covering both ordered and disordered phases. In addition, we calculate the autocorrelation function which shows first, highly correlated jumps of the vacancy in the lattice at low temperatures and second, the atoms that jump to positions of its own sublattice at moderate temperatures.

This work is concerned about the lithium-nickel phosphate, LiNiPO4, a very important magneticelectric material due to its promising applications to tailor the next-generation lithium-nickel batteries. In the Hamiltonian operator, it is considered the interactions of Ni2+, the unique magnetic ion in the phosphate. Specifically, it is taken into account the Heisenberg interactions along with the single-ion anisotropy term. Furthermore, the utilization of the Holstein-Primakoff formalism leads to spin-wave scattering. To investigate the spin-wave intensities, we utilize the nonextensive probability distribution what originates some bulges in the curves of the intensities.

In this work, we made an analysis of the learning and teaching circumstances of the Physics School and in this context, we analyze an experiment that familiarizes the student with basic nuclear instrumentation which includes techniques and measurements methods of gamma rays spectrometry using radioactive sources of 22Na, 60Co, 137Cs and a NaI(Tl) scintillation detector. This experiment includes, also, the development of a multichannel analyzer prototype.