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Solid-solid surface adsorption of Eu2O3 on amorphous Al2O3 have been investigated by Mossbauer spectroscopy, X- ray diffraction analysis and laser Raman spectra (LRS). No X-ray diffraction peak of crystalline Eu2O3 can be found for all samples studied. The LRS show that two peaks at 998 and 1051 cm-1 assigned to two-dimensional surface europium-oxygen species appear at Eu2O3 content of 18.7 wt%. The peak at 1068 cm-1 due to the surface species and another peak at 342cm-1 due to crystalline Eu2O3 content start to appear for the sample with an Eu2O3 content of 36.5 wt%. The dispersity of Eu2O3 on the surface of amorphous Al2O3 were compared with that of α-Al2O3,η-Al2O3 and SiO2 gel. The results of these studies indicate that the structure of Eu2O3 dispersed onto the support surface depend on the structure of support and that there is an inductive effect of support on the structure of the Eu2O3. 相似文献
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Six kinds of typical commercial Fe2O3 were sampled and divided into two groups A and B. according to the magnetic measurement results. The samples of group A are of susceptibility about 10-4 and the specific saturation magnetization σs 0.2-0.3 A.M2/kg, being consistent with the feature of antiferromagnetic α-Fe2O3. While the samples of group B display strong magnetism with susceptibility 10-1-10-2 and σs 1.7-12 A.M2 /kg. Mossbauer spectra of the samples were investigated at room temperature in an external magnetic field. It is suggested there is the y - Fe2O3 phase in the group B according to the relative intensities of spectra I(2,5)/I(3,4). This was proved by the Mossbauer spectra for the mixed samples A with γ-Fe2O3 at various contents and by measuring the dependence of specific saturation magnetization on temperature for the samples of group B. 相似文献
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MOSSBAUERSPECTROSCOPYOFHIGHT_cYBa_2(Cu_(3-x)Fe_x)O_y¥LiShi(李士)andLiYinhua(李印华)(InstituteofHighEnergyPhysics,Beijing100080,Chi... 相似文献
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Mossbauer spectra for 5 nm Fe3O4 particles coated with different surfactants (the polar end groups as -COONa and -SO3Na) were measured and show a significant influence on superparamagnetic relaxation with and without the solvent. Some phenomena were explained by the superparamagnetism and the surfactant hydrophilicity. 相似文献
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本文介绍了三种无机/有机防氚复合材料,即SiOx/PVC复合材料、Al2O3/PVC复合材料、Al2O3/SiOx/PVC复合材料的制备,并与普通PVC材料进行了防氚效果测试比较。结果显示,在1atm,氚气浓度为7.48×108Bq/L的情况下,三种复合材料对氚的渗透率分别为2.88×104Bq/(cm2·h)、2.09×104Bq/(cm2·h)、0.64×104Bq(/cm2·h),较普通PVC材料氚渗透率7.18×104Bq(/cm2·h)明显降低;三种复合材料氚渗透达到稳态的延迟时间分别为18.8、20.1、63.7h,明显大于普通PVC的2.1h。说明相对于普通PVC材料,三种复合材料对氚的渗透率低、延迟时间长、有较好的阻氚性能。其中Al2O3/SiOx/PVC复合材料的性能最好,明显优于氯丁橡胶。 相似文献
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为了研究离子辐照对薄膜结构的影响,对氩离子辐照磁控溅射沉积的ZrO_2-8%(m/m)Y_20_3薄膜,用XRD、AES及XPS进行微观分析。结果表明,溅射沉积的无定形薄膜经离子辐照后发生了晶化,膜内元素与基体元素发生了显著的混合,表面污染的碳向膜内迁移。此外,还研究磁控溅射沉积ZrO_2-8%(m/m)Y_2O_3薄膜氩离子辐照前后表面Zr(3d),Y(3d),O(1s)结合能的位移情况。 相似文献