The effect chromium doping in cobalt ferrites, in the nano scale, has been studied. Structure, morphology, electrical and magnetic transport of CoFe_2-xCr_xO₄ (x = 0, 0.5, 1, 1.5) has been investigated in detail. Sol-gel method has been used to get nano crystalline size of the prepared spinel structure. The formed gel has been fired at 600 °C temperature. Single cubic crystal phase is formed according to analysis of X-ray diffraction patterns and infra-red spectra. The decrease in both the lattice constant and the crystalline size has been observed as a result of Cr doping. Moreover, the electron density inside the unit cell has decreased as a result of Cr doping. All samples have been homogenously formed in the nano-crystallized size in the range from 7 to 16 nm. There has been a phase transformation (exothermic peak) at point 342 °C for x = 0.0 and 362 °C for samples containing extra Cr ions for the DSC curve. The two essential absorption bands ν₁ and ν₂ have been observed in the range 560–610 (for all prepared samples) and 420 cm⁻¹ (for all doped samples with Cr ions), respectively for infra red analysis. The electrical properties have showed semiconductor behavior. The magnetic properties of these compounds have been studied. They have demonstrated ferrimagnetic ordering type. From the magnetic hysteresis loop, it has been noted that the coercivity H_Ci has decreased as a result of the substitution of iron with chrome. CoFe₂O₄ has been higher coercivity of 1595.4G and the coercivity has decreased to be 114.6G for CoFe_0.5Cr_1.5O_4.

已经研究了纳米级钴铁氧体中铬掺杂的影响。CoFe _2-x Cr _x O _{4 的}结构、形态、电和磁传输(x = 0, 0.5, 1, 1.5) 已被详细研究。溶胶-凝胶法已被用于获得所制备尖晶石结构的纳米晶体尺寸。形成的凝胶已在 600 °C 的温度下烧制。根据 X 射线衍射图和红外光谱的分析，形成了单立方晶相。由于 Cr 掺杂，已经观察到晶格常数和晶体尺寸的降低。此外，由于 Cr 掺杂，晶胞内部的电子密度降低。所有样品均以 7 至 16 nm 范围内的纳米结晶尺寸均匀形成。对于 DSC 曲线，x = 0.0 时在 342 °C 处发生相变（放热峰），而含有额外 Cr 离子的样品在 362 °C 处发生相变（放热峰）。两个基本吸收带ν ₁和ν ₂分别在 560–610（对于所有制备的样品）和 420 cm ^-1（对于所有含有 Cr 离子的掺杂样品）范围内观察到，用于红外分析。电性能已显示出半导体行为。已经研究了这些化合物的磁性。他们已经证明了亚铁磁性排序类型。从磁滞回线可以看出，由于用铬代替铁，矫顽力H _C i 降低。CoFe ₂ O _{4 的}矫顽力较高，为 1595.4G，CoFe _0.5 Cr _1.5 O ₄的矫顽力下降至 114.6G _。