Powder samples of the ferrites MxNi1−xFe2O4 (M = Cr, Co and 0.0 ≤ x ≤ 0.3) were prepared using a chemical co-precipitation method. X-ray diffraction analysis showed that the two series of samples had a single-phase cubic spinel structure. It was found that the magnetic moments (μexp) per formula of samples measured at 10 K decreased when Cr substituted for Ni, but increased when Co substituted for Ni, in spite of the fact that the magnetic moments of Cr2+ (4 μB) and Co2+ (3 μB) are higher than that of Ni2+ (2 μB). With the assumption that the magnetic moments of Cr2+ and Cr3+ lie antiparallel to those of the Fe, Co, and Ni cations in the same sublattices of spinel ferrites, the dependences on the Cr (Co) doping level of the sample magnetic moments at 10 K were fitted successfully, using the quantum-mechanical potential barrier model earlier proposed by our group. For the two series of samples, the fitted magnetic moments are close to the experimental results.
Cation distributions estimated using the magnetic moments of the spinel ferrites Co 1−𝑥 Cr 𝑥 Fe 2 O 4 at 10 K * Shang Zhi-Feng(尚志丰) a) , Qi Wei-Hua(齐伟华) a) , Ji Deng-Hui(纪登辉) a)b) , Xu Jing(徐 静) a) , Tang Gui-De(唐贵德) a) † , Zhang Xiao-Yun(张晓云) a) , Li Zhuang-Zhi(李壮志) a) , and Lang Li-Li(郎莉莉) a) a)
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