During the preparation of this research ferrites - copper powder chemical auto-combustion
method ,has been studying the effect of changing of (pH=3, 5, 7, 9, 11) coefficient on the
particle size of the powder, used Debye-Scherrer Formula, to calculate the particle size by use
of the highest peak (311) in X-ray diffraction (XRD) were obtained particle size ranges (11.5-
13.75) nm, and also has been compared to the values obtained in drawing curves that represent
change the lattice constant, particle size and density as a function of the (pH), and used Infrared
spectroscopy (FTIR) to determine the internal structure of models, and also has been studying
the microscopic structure took photos by electron scan microscopy (SEM) where indicated
formation of high porosity homogeneous this change in the acidity coefficient(pH) led to change
particle size and therefore a change in the properties of structural and physical .