Nuclear Magnetic Resonance of Co59 in Ferromagnetic Cobalt Compounds Co3B and Co2B

The internal magnetic field and the quadrupole splitting of Co 59 in ferromagnetic cobalt compounds, Co 3 B and Co 2 B, were measured. The thermomagnetic curve of Co 2 B was also measured. A dispersion type signal and four septet absorption type signals were found in the resonance pattern of Co 59 in Co 3 B, while only a septet absorption type signal was found in Co 2 B. The internal magnetic fields of Co 59 in Co 3 B extraporated to 0°K ranged from 137.9 KOe to 112.3 KOe, while that in Co 2 B was 54.5 KOe. Comparing with the data on Co 2 B, the contributions from the two crystallographic cobalt sites in Co 3 B were discussed. The electronic structure of cobalt borides was considered on the basis of the present data and those on other transition metal borides, carbides and nitrides.