Abstract
Two series of solid solutions, Ho 1- x La x C 2 and Nd 1- x LaC 2, have been made and their X-ray unit cell parameters measured. The Ho 1- x La x C 2 series contains two tetragonal phases and a cubic solid solution series which has enabled the reaction rate constants for the water hydrolysis reaction of a cubic dicarbide phase to be determined for the first time. By comparing the linear rate constants and the activation energies across the two series the nature of bonding in general and the structure of the cubic phase are elucidated. A comparison with microhardness data is made and the change in M -C 2 bonding as a function of composition is considered.
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