Nuclear Magnetic Resonance Studies of Beryllium-Based Laves Phase XBe2

The nuclear magnetic resonance (NMR) of Be 9 has been investigated with several beryllium-Laves phase intermetallic compounds TiBe 2 , CrBe 2 , MnBe 2 and CuBe 2 at various temperatures from 77°K to 300°K. The Knight shift of Be 9 resonance was found to be constant: (∼-0.01%) in CrBe 2 and (∼-0.06%) in MnBe 2 at all temperatures. In TiBe 2 the shift of Be 9 resonance depends on temperature, and varies from (-0.08%) to (-0.04%) in the temperature range from 77°K to 300°K. The NMR of Mn 55 in MnBe 2 and Ti 47 +Ti 49 in TiBe 2 have also been observed. The shift of Mn 55 resonance was (∼-0.8%), which was temperature independent, while that of Ti 47 +Ti 49 varied from (∼-0.5%) to (∼+0.07%) in the temperature range from 77°K to 300°K. As for Ti 47 +Ti 49 resonance, the relation between the Knight shift (K) and the susceptibility (χ) is linear. From the K vs. χ curve the apparent hyperfine field can be estimated at 27Koe/spin. This small value of hyperfine field may be considered to have resulted from a mixture of s character into the d wave functions. A simple band mode is proposed to account for the NMR properties of these compounds.