“…A detail study on effect of synthesis temperature on phase formation in CuFe 2 O 4 by Parfenov and Nazipov [2] have shown that for CuFe 2 O 4 samples sintered at T s ≥ 1050 • C, the spinel phase begins to decompose, and a second phase, presumably delafossite (CuFeO 2 ) appears, as reflected from Mössbauer spectral analysis, while Xray diffraction pattern analysis fails to detected this phase up to T s = 1100 • C. On the other hand, phase analysis study of copper-ferri-aluminates, CuAl x Fe 2−x O 4 (x = 0.0-0.6) by X-ray diffractometry and Mössbauer spectroscopy by Almokhtar et al [3], have shown that samples sintered at 1050 and 1100 • C have CuFeO 2 phase beside the main matrix of CuAl x Fe 2−x O 4 (x = 0.0-0.6), and on Al 3+ substitution, intensity of paramagnetic doublet that corresponds to delafossite phase decreases and completely disappeared for Al 3+ content (x) ≥ 0.3. The effect of firing temperatures (900-1300 • C) and time on phase formation as well as the physical and magnetic properties of nanocrystalline copper ferrite has been studied by Ahmed et al [4].…”