Vanadium borides

Figure 1. Structural series of vanadium borides and mode of formation VnB + i (n - 1) VB + VB2 n = 1,2,3,5. The structures are projeeted along [100] large eireles are metal atoms small eircles are B atoms filled circles are atoms in x — 1/2, open eireles are atoms in x = 0.

Vanadium Boride, VB, is prepared by fusing a mixture of the elements in vacuo at the temperature of the electric furnace. It is a... 

Borides. Vanadium borides have been reviewed.67,68 The results of a 51V n.m.r. study358 of VB are consistent with the boron acting as an acceptor of electrons from the metallic a-band. However, there are surprising differences between the n.m.r. parameters of VB and those of the isostructural NbB which indicate that the details of the band structure of even very closely related borides are probably quite dissimilar. 

Vanadium boride Vanadium boride Vanadium carbide... 

Phase equilibria in the Ce-V-B system at 800°C (fig. 17) were established by X-ray analysis of 40 arc melted and subsequently heat treated (in evacuated silica tubes, 800°C, 800 h) alloys (Mikhalenko and Bilensh, 1979). Starting materials were of 99.9 min. purity. Solid solubilities of binary compounds were negligible and no ternary compounds were found to exist. The vanadium borides observed V2B3 (UjSij-type), VB (CrB-type), VjB (VsB -type), V3B4 (TajB4-type), VjB, (VjBj-type) and VB2 with AlBj-type are in good accordance with a recent critical assessment of the V-B binary by Spear et al. (1981). 

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