Zinc ferrite nanoparticles were obtained by chemical methods (co-precipitation and thermal decomposition of metalorganic compounds) and systematically probed with volume (XRD, VSM), microscopic (TEM) and element sensitive probes (ICP-OES, Mössbauer Spectroscopy, XPS, XAFS). Magnetic studies proved the paramagnetic response of stoichiometric ZnFe₂O₄ (ZF) nanoparticles, while superparamagnetic behavior was observed in as-synthesized, non-stoichiometric Zn_xFe_3−xO (NZF) nanoparticles. Upon annealing up to 1400 °C in an inert atmosphere, a significant change in the saturation magnetization of NZF nanoparticles was observed, which rose from approximately 50 up to 140 emu/g. We attribute this effect to the redistribution of cations in the spinel lattice and reduction of Fe³⁺ to Fe²⁺ during high-temperature treatment. Iron reduction is observed in both ZF and NZF nanoparticles, and it is related to the decomposition of zinc ferrite and associated sublimation of zinc oxide.

通过化学方法（金属有机化合物的共沉淀和热分解）获得铁氧体锌纳米颗粒，并用体积（XRD，VSM），显微镜（TEM）和元素敏感探针（ICP-OES，穆斯堡尔光谱，XPS，XAFS）进行系统探测。磁性研究证明了化学计量的ZnFe ₂ O ₄（ZF）纳米粒子的顺磁响应，而在合成后的非化学计量的Zn _x Fe _{3− x中}观察到超顺磁行为O（NZF）纳米粒子。在惰性气氛中退火至1400°C时，观察到NZF纳米颗粒的饱和磁化强度发生了显着变化，从大约50上升到140 emu / g。我们将此效应归因于尖晶石晶格中阳离子的重新分布以及高温处理过程中Fe ³⁺向Fe ^2+的还原。在ZF和NZF纳米颗粒中均观察到铁还原，这与铁素体锌的分解和氧化锌的相关升华有关。