X-ray diffraction studies on the thermal decomposition mechanism of nickel hydroxide.
Nickel hydroxide samples were prepared by using sodium hydroxide and ammonium hydroxide as precipitating agents. The powder X-ray diffraction pattern shows that the degrees of crystallinity in these samples are quite different. The thermal decomposition mechanism of these two nickel hydroxide samples has been determined using powder X-ray diffraction and thermogravimetric analysis. We observe that the transformation of nickel hydroxide to nickel oxide in the crystalline sample is via a two-phase mixture, whereas in a poorly ordered sample, it is through a single phase. This indicates that the decomposition mechanism mainly depends on the preparative conditions and the nature of the sample.
Ramesh
Thimmasandra Narayan
TN
Department of Chemistry, Central College, Bangalore University, Bangalore 560 001, India. adityaramesh77@yahoo.com