关晓宇
,
赵勇
,
贾晓秋
低温物理学报
对YBa2 Fe3O8的掺杂研究是认识该晶体的有效手段,本文采用固相法制备YBa2 Fe3O8-xFx,并以实验样品的DTA曲线和M-T曲线为依据,讨论了掺F的YBa2 Fe3O8在热学性质和磁化性质以及晶格结构方面的性质变化.实验结果表明,随着F量增加,χ(T)变大、Tp与Ts降低,所得到的实验数据与晶格分析结果基本一致.
关键词:
YBa2Fe3O8
,
掺杂
,
热学性质
,
磁化系数
Hesham I.Saleh
材料科学技术（英文）
Calcium ferrite compounds were prepared using calcium nitrate and iron nitrate with different molar ratios, 1:1, 0.5:1, and 1:0.5, respectively. The reactions of formation were investigated at different temperatures following the differential thermal analysis (DTA) results. Calcium ferrite compounds are CaFeO3, Ca2FeO3.5, Ca2Fe2O5, CaFe2O4, CaFe4O7, Ca7.2F0.8Fe30O53, Ca3Fe15O25, Ca4Fe14O25, and Ca4Fe9O17. Other reactive species of calcium nitrate are still present after firing at 450ºC. Compounds were characterized using X-ray diffraction (XRD), DTA, TG, magnetic susceptibility, infrared spectra and scanning electron microscope (SEM). It is concluded that the formation mechanism of Ca-ferrite compounds depends mainly on the valency of iron cations which in role depends on its molar ratio and the existing atmosphere.
关键词:
Ca-ferrite
,
null
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null
