Nuclear magnetic resonance on oriented rare-earth nuclei in rare-earth hosts: Application to 160Tb.
We summarize the application of nuclear magnetic resonance of oriented nuclei to rare-earth impurities implanted in ferromagnetic crystals of heavy rare-earth hosts. The experimental aspects are treated in some detail; we present results obtained on $^{160}\mathrm{Tb}$$\mathrm{Tb}$, and give a formal description of the experiments. A discussion of extension to other, similar systems with applications in nuclear, solid-state, and low-temperature physics is given.
Nuclear orientation and quadrupole interaction
In quadrupole-interaction nuclear-orientation experiments (QI-NO) the quadrupole interaction frequency VQ=e2qQ/h is determined from the angular distribution of γ-rays emitted in the decay of radioactive nuclei oriented at low temperatures as impurities in noncubic single-crystal matrices. This means that either the spectroscopic quadrupole moment Q of radioactive isotopes or the crystal electric field gradient eq can be determined from QI-NO experiments. Recent developments in QI-NO are discussed, especially with regard to the investigation of nuclei far from stability, with the following main topics: (1) Experimental aspects; (2) Quadrupole moments of short-lived nuclei; (3) Systematics of electric field gradients; (4) QI-NO with “new” host lattices, such as dichalcogenides; (5) Resonance techniques.
Finite Difference Modeling on the Temperature Field of Substrate in Friction Surfacing
Friction surfacing is an advanced process of great potential, especially in the field of repair and reclamation of worn and damaged components. As a kind of thermal processing technology, the temperature profile and changes of the substrate in friction surfacing are important factors to get coatings of high quality. In this paper, the temperature field of the substrate during the process is simulated by finite difference method. The results are consistent with experiments, reappearing the temperature change of the substrate during friction surfacing, allowing further study on figuration and quality of coatings.