NMR-STUDY OF THE ELECTRONIC-STRUCTURE IN ZIRCONIUM DIHYDRIDES

In this investigation, the proton spin-lattice relaxation time T-1 has been measured as a function of temperature to probe the electronic st ructure of the dihydride phases in ZrHx. Experimental results indicate that the d-band density of states at E(F) has a local maximum near x similar to 1.8. Furthermore, the values of the experimental parameter q(e) estimated using the spin-lattice relaxation time T-1 and the Knig ht shift K have been found to be 0.3<q(e)<0.5 for the face-centered-te tragonal (fct) ZrHx. This result strongly suggests that the d-band den sity of states Nd(EF) is much larger than the a-band density of states N-s(EF) in fct ZrHx. However, it can be inferred from q(e)=1.54 for Z rH1.58 that there is an appreciable mixture of the Fermi-contact and t he core-polarization interactions in the face-centered-cubic (fcc) ZrH x.