is transferred to the powders, increasing the lattice energy Using X-ray diffraction analysis and Raman spectroscopy and decreasing the activation energy. What is unresolved techniques, a mechanically induced double displacement reacis the nature of the defects which store the excess energy, tion has been used to investigate the chemical mechanism by and how this influences the reaction pathway. The aim which mechanical alloying occurs. The specific reaction studied of this article is to study the reaction from a crystallowas the reduction of cupric oxide by iron. From Rietveld analygraphic point of view, and in this way examine strain sis of milled powders, isotropic atomic displacement parameters accumulation in a crystal lattice during a reaction. are refined and the lattice strain involved in displacing oxygen Favas et al. (5) used anisotropic Gaussian atomic disin the CuO lattice is then calculated. In addition, anisotropic placement parameters (ADPs) to visualize phase changes atomic displacement parameters are refined, providing inforin K 2 TaF 7 . Argyriou (6) isolated static disorder contribumation regarding the reaction pathway. Raman spectroscopy tions from thermal vibrations in measured ADPs of ZrO 2 in is used to differentiate between thermal motion and static disa temperature dependent neutron diffraction study. These placement of oxygen atoms in the CuO lattice. Using this information, the mechanism of a mechanically induced solid state examples point to the possibility of following reactions reaction is described.