B - Zr (Boron - Zirconium)

H. Duschanek and P. Rogl

A thermodynamic calculation of the B-Zr binary is from [1988Rog]; a refinement of this calculation is due to [1998Dus]. With respect to the critical assessment in [1988Rog] it should be noted that the compositions of the liquidus l/l + ZrB₂ as reported by the various research groups reveal a remarkable experimental scatter owing to the lack of suitable crucible materials for the aggressive B-containing melts at elevated temperatures. The Pirani melting point technique used by [1966Rud] and others is virtually incapable of providing reliable liquidus data, because of the gradual loss of mechanical strength of the sample specimen during measurement and due to the loss of the black body condition when increasing amounts of melt are filling the black body measuring hole. Crystallographicdata for the binary bou...