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2价锌替代Fe3O4纳米颗粒中的2价铁对磁性的影响 总被引:2,自引:0,他引:2
采用化学共沉淀法制备了一系列粒径为15nm左右的ZnxFe3-xO4(x=0,0.15,0.3,0.48,0.7,0.85)颗粒。颗粒的结构通过X-射线衍射证实均为尖晶石结构。磁性研究发现随着锌含量的从零增加到0.15,居里温度Tc从565℃下降至500℃,饱和磁矩在锌为0.3掺入量时达到最大(76.1emu/g),然后随锌含量增加而下降;矫顽力和剩余磁矩随锌含量增加单调减小。最后我们探讨了在10~2GHz频率范围内不同锌含量的锌铁铁氧体颗粒的磁导率随频率的变化关系。 相似文献
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This paper presents numerous physical characteristics of Ca,V.Sn doped yttrium iron garnet(CaVSn:YIG) irradiated with 0.56GeV carbon ions delivered by the Heavy Ion Research Facility of Lanzhou (HIRFL).The reason for change of the magnetic properties of the samples induced by energetic carbon ions bombardment is discussed.By comparison of this results with the irradiation effects of YIG induced by eneregetic argon,krypton and xenon oibtained on the GANIL,Caen,France,it is concluded that the irradiation effect of 0.56GeV C^6 on CaVSn:YIG arises from the electronic energy losses. 相似文献
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Y1.6Ca1.4V0.45Sn0.5Fe4.05O12 is irradiated by 0.56GeV carbon ion.The irradiation effect is investigated by Moessbauer spctroscopy.The irradiation results in an isotropic distribution of the hyperfine magnetic field.The hyperfine magnetic fields decrease after the irradiation due to the change of supertransferred field.After the irradiation,the chain Fe(a)-oxygen-Fe(d) become longer and it leads to decrease of the supertransferred field. 相似文献
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用兰州重离子研究装置(HIRFL)首次进行了47MeV/u的C^6^+离子辐照CaVSn:YIG的实验。通过穆斯堡尔效应和正电子寿命测量对47MeV/u的C^6^+离子在CaVSn:YIG中的辐照效应进行了初步研究。发现辐照导致内磁场方向趋于各向同性分布,由穆斯堡尔谱未观察到非晶化现象。缺陷的数量随C^6^+离子在样品中电子能量损失的增加而增加。 相似文献
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