Nuclear Magnetic Resonance and Susceptibility Measurements of Transition Metals and Alloys V‐Ta, V‐Nb, and Nb‐Ta Systems

Abstract

The Knight shift of V51 and NbQ3 and the magnetic susceptibility have been measured in binary alloys of 3d, 4d, and 5d transition metals including vanadium, niobium, and tantalum. The experimental results and estimates of the various contributions to K and x show that the orbital contribution due to d-electrons is dominant in these alloys. In the calculations of the various contributions, both the electron-phonon interaction and s-d hybridization are taken into account. 1. Introduction I n order to interpret the magnetic properties of metals and alloys in terms of their electronic structures, the Knight shift K and the magnetic susceptibility x are important quantities. We have investigated the nuclear magnetic resonance -the Knight shifts of V5I and NbQ3 and the magnetic susceptibility in 3d, 4d, and 5d transition metal alloys, namely, in V-Ta, V-Nb, and Nb-Ta binary alloy systems. The Knight shift observed in transition metals and alloys is it sum of contributions resulting from orbital and core polarization interactions with the d-band electrons, as well as the s-contact interaction. The purpose of this paper is to find the composition dependence of K and x and to estimate the relative importance of various contributions to them. BThe first investigations of NMR properties and magnetic susceptibilities of the V-Nb system have been published in [l] but in their calculations and estimations of various contributions the electron-phonon interaction was not taken into account and measurements have been carried out only a t room temperature. In the present work the electron-phonon interaction is taken into account as well as the s-d hybridization.

1H‐NMR Studies of the Systems Ta1−xVxHy(0.0 ≤x≤ 1.0; 0 <y≤ 0.9), and Nb1−xVxHy(0.0 ≤x≤ 0.5; 0 <y≤ 0.9). Magnetic Susceptibility, Knight Shift, and Longitudinal Relaxation

“…The analysis of the molar magnetic susceptibility XM (x) for both systems is listed in Tables 1 and 2. The data are compared with the susceptibility measurements of Kalantarian and Chechernikov who studied X(Tal_xVx) and X(Nb, -x Vx) by the Faraday method [28]. The differences between their results of XSpin (x) and XOrb (x) and ours occur because they neglected the spin enhancement.…”