Abstract
Abstract Three series of tetragonal substitutional solid solutions have been prepared for the systems Ho1−xYxC2, Lu1−xYxC2 and Er1−xGdxC2 and the kinetics of their reaction with water have been studied. A linear reaction rate constant was observed for all samples. The reaction rate for YC2 at 1.93 cm cm−2 min−1 is anomalously fast from ionic size considerations; YC2 is shown to be closer to GdC2 in its hydrolysis and hardness behaviour than to HoC2 with which it is closely related in size. The results are discussed in terms of CC bond length distances and f character of the bonding electrons in the covalent component of the MC2 bond.
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