Calculated lattice relaxation in Pu-Ga alloys

Invar effect in Pu-Ga alloys

We show that the anomalous thermal expansion behavior of Pu-Ga alloys can be explained by an invar effect, which is modeled by assuming the thermal transfer of Pu atoms from a lower-energy, higher-volume δ1 state to a higher-energy, lowervolume δ2 state. From a fit to the available neutron diffraction data on the lattice constants of Pu-Ga alloys, the energy separation of these states is found ...

Dominant recombination centers in Ga(In)NAs alloys: Ga interstitials

Phonon softening in Ni-Mn-Ga alloys

The TA2 phonon dispersion curves of Ni-Mn-Ga alloys with different compositions which transform to different martensitic structures have been measured over a broad temperature range covering both paramagnetic and ferromagnetic phases. The branches show an anomaly (dip) at a wave number that depends on the particular martensitic structure, and there is softening of these anomalous phonons with d...

Magnetic domains in magnetostrictive Fe–Ga alloys

Lorentz microscopy was applied to the observation of magnetic domains in iron-gallium (Fe–Ga) alloys. Results did not show any link between the magnetic domains and the magnetostriction enhancement by Ga addition, but did reveal that the drastic decrease in magnetostriction for Fe–31.2 at. % Ga was due to the presence of large scale precipitates. Magnetic domain features did not change in the a...

Relaxation times calculated from angular deflections

In this paper we measure the two-body relaxation time from the angular deflection of test particles launched in a rigid configuration of field particles. We find that centrally concentrated configurations have relaxation times that can be shorter than those of the corresponding homogeneous distributions by an order of magnitude or more. For homogeneous distributions we confirm that the relaxati...