穆斯堡尔谱镜像折叠新方法

通常,对穆斯堡尔谱折叠是消除基线几何效应的有效方法,数据获取效率也有所提高。介绍了一种新的折叠方法,解决了折叠过程中一般以谱线中心作为折叠点,而没有考虑到多普勒速度落后于驱动信号,这种方法会带来明显的线宽加宽的问题。     

压水堆核电站三回路海水管道中涡轮受腐蚀的穆斯堡尔研究

用内转换电子穆斯堡尔谱学方法 ,配合X衍射能谱研究了秦山核电站一期压水堆三回路海水中涡轮叶片的腐蚀。研究结果表明 ,应力作用驱使内部马氏体相的形成 ,是影响叶轮寿命的主要原因。这个过程没有新的化学物质产生 ,只涉及钢在不同相之间的转变 ,是物理性的。而海水应力作用对涡轮表面层和基体的影响稍有不同。     

薄膜中内转换电子的输运过程

用蒙特卡罗方法对~(57)Fe 7.3keV的内转换电子在厚度为1.0nm到300.0nm薄膜中的输运过程进行模拟。分析结果表明,当薄膜深度大于150.0nm时,出射电子的透射率已十分低。根据电子出射的能量、角度与深度的关系曲线可以看出,我们既可用探测出射电子的能量,也可以用探测出射电子角度的方法来获取薄膜深度的信息。因此,角度相关的内转换电子穆斯堡尔谱(ACEMS)可成为研究薄膜深度信息的一种新途径。     

Ba(Sb0.5In0.5)O3中Sb电子排布的穆斯堡尔研究

用水热合成方法制备了复合钙钛矿结晶Ba(Sb0.5In0.5)O3,并用穆斯堡尔谱学方法配合X射线衍射,研究了其中锑的电子排布。实验结果显示：锑以 5价存在,没有混合价态出现;锑与最近邻氧出现轨道杂化、以共价键结合。     

MOSSBAUER STUDIES OF HEMOGLOBIN AND THE IMMUNE FUNCTION OF RBC OF THE PATIENTS WITH HEPATIC DISEASES

Red blood cells (RBC) of the patients with cirrhosis and with primary liver cancer were studied by using Mossbauer spectroscopy. The measurements of RBC from normal adults were made as control. Results showed that the subspectrum representing deoxy-Hb either disappeared or diminished, but no other subspectrum was detected in the samples from the patients. In addition, the immune function of RBC of these two types of patients was measured by using immune-adherence haemagglutination (IAHA), which indicated that its immune function was significantly lower than that of normal adults (P<0.01). These experimental results showed that the components of hemoglobin in RBC are correlated with the immune function of RBC.     

监测大气中铁污染的一个新方法

铁污染是大气污染中较为常见的一类。虽然人们常用滤纸收集然后用化学方法分析,但本文提出用穆斯堡尔谱学这一核方法来分析悬铃木上的绿斑,可以准确了解铁污染的分布,而且不仅可以定量,还可以了解污染物的化学结构,甚至铁颗粒尺寸的大体分布,方法简便。     

Fe~(3+)在钠硅酸盐玻璃中结构效应的研究

本文应用穆斯堡尔谱、红外光谱和X射线荧光分析等方法,分别测定了碱硅酸盐玻璃中Fe~(3+)、B~(3+)、Al~(3+)离子的配位状态,分析了它们共存时在玻璃中产生的结构效应,以及对密度上“铁-硼反常现象”的影响。 实验结果表明,Fe~(3+)、B~(3+)共存时,B~(3+)不改变Fe~(3+)的配位数,而Fe~(3+)具有促使B~(3+)由[BO_1]四面体转变成[BO_3]三角体的能力。实验还表明,Fe~(3+)、A1~(3+)、B~(3+)共存而“游离”氧不足时,三种阳离子进入四配位的能力为:AP~(3+)>Fe~(3+)>B~(3+)。     

AN INVESTIGATION OF THE PERMANENT MAGNETS Nd_(15)(Fe, Co)_(77)B_8 WITH Dy AND Al ADDITIVES

Nd-(Fe,Co)-B alloys with Dy and Dy-Al additives have been studied by the Mossbauer effect and X- ray diffraction. The results indicate that the alloys consist of a tetragonal phase, a B-rich phase and a Nd-rich phase. The average magnetic moment of Fe atoms in the tetragonal phase has been determined. The variation of remanence due to Dy and Dy- Al additives has been derived from the Mossbauer data and found to agree with the results of magnetic measurements. The site substitutions of Dy and Al in the alloys are also discussed.     

EFFECT OF SOLVENT ON THE MAGNETIC INTERACTIONS BETWEEN Fe_3O_4 PARTICLES AND SURFACTANTS

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.     

Mossbauer study of martensitic transformation andcollective magnetic excitations in Fe_9Ni．1 fine particles

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