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Deintercalation of calcium from the interlayer of CaSi 2 was performed by using concentrated HCl solutions at low temperatures, 0 and -30°C. In the reaction at 0°C, the deintercalation took place in two steps with evolution of 1/2 mole of hydrogen per mole of CaSi 2 in each step. In the reaction at -30°C, little evolution of hydrogen was observed. The quantitative chemical analysis,...
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