With the patterns of the samples
milled for 60 min here, the peaks of CaO appear dominantly in
every sample irrespective of the molar ratio of Ni(OH)2. It means
that dehydrochlorination has not obviously taken place with such a
short time of milling whether Ni(OH)2 is added or not. On the other
hand, milling of the sample mixtures results in some changes.