Very weak peaks of Ca(OH)2 have been observed due to the absorption
of water by CaO during sample handling. It is more interesting to
note that the peaks of Ni(OH)2 remain low and nearly amorphous
even with the increase in molar ratio of Ni(OH)2 up to 2moles. This
can be understood that Ni(OH)2 has been fully milled and dispersed
among the mixture.