磁铁矿
铁酸锌
锌
纳米颗粒
分析化学(期刊)
尖晶石
材料科学
化学
铁氧体(磁铁)
穆斯堡尔谱学
核化学
无机化学
结晶学
纳米技术
冶金
色谱法
复合材料
作者
Miha Drofenik,Matjaž Kristl,Darko Makovec,Zvonko Jagličić,D. Hanžel
标识
DOI:10.1016/j.ultsonch.2007.10.002
摘要
Nanoparticles of zinc-doped maghemite were prepared using ultrasonic radiation. As a precursor, a suspension of maghemite in an alkaline aqueous solution of zinc nitrate at pH 9 was sonicated. The zinc-doped maghemite nanoparticles were investigated by X-ray diffraction, Mössbauer spectroscopy, high-resolution electron microscopy (HREM) and SQUID magnetometry. The Mössbauer measurements, which cover the temperature range 4.2 K to room temperature, were acquired in zero field and an applied field of 5 T. The results show that by using ultrasound radiation, zinc Zn2+ can substitute for Fe3+ up to a composition close to zinc ferrite (ZnFe2O4), which has a random distribution of Fe3+ ions over both A and B sublattices in the spinel structure with an inversity parameter of δ = 0.322. This leads to a maximum saturation magnetization (Ms) of 64.1 emu/g at 300 K and 73.5 emu/g at 2 K.
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