11B and 89Y MAS NMR and magnetic characterization of Y B4

11B and 89Y MAS NMR spectra at room temperature and magnetization in the temperature range (2-300 K) were measured on a powder specimen of Y B4. The three different 11B Knight shifts (34.7, 12.6 and 5.4 ppm) for the crystallographic sites B1(4e), B2(4h) and B3(8j), respectively, were observed in a magnetic field of 17.6 T. The 89Y isotropic Knight shift (294.6 ppm) and Kxx,Kyy and Kzz components of the Knight shift tensor have been determined. The spin-lattice relaxation times, T1(11B)=4.5s and T1(89Y)=5.5s, were measured at room temperature. Analysis of the magnetization data have indicated that Y B4 is a diamagnetic compound with the temperature independent component of its magnetic susceptibility equal to −5.9∗10−9(m3/kg). Some of these data were referred to those of CaB4−xCx(x=0.21), LaB4,NdB4 and Y5Si2B8.