最新刊期
      卷 0 ， 期 0 ， 2020
      • Wang Tianmin Shi Ji Lin Ping
        Issue 8, (1992)
        摘要：The fertting behaviour of Ti6Al4V alloy implanted with nitrogen, carbon and combined nitrogen and carbon was investigated. AES and TEM were used to determine the chemical compositions of the implanted layers, and SEM and EDX to observe the fretted surface of specimens and to determine the compositions of the fretted surface. Moreover, the fretting mechanism of the alloy before and after ion implantation was studied.  
          
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        发布时间：2021-04-09
      • Li Daiqing
        Issue 8, (1992)
        摘要：The relations between angular distributions of sputtered atoms from a copper target and incident angles of 100 keV Ne+ and Ar+ have been investigated. The experimental results show that at incident angles of 40°and 70°,the preferential sputtering directions for the incidence of 100 keV Ar+ are on two sides of the surface normal respectively and the angular distributions are not symmetric about the surface normal; while for the incidence of 100 keV Ne+, the preferential sputtering directions are in the direction of surface normal and the angular distributions are symmetric about it. The experimental results are analyzed by using the cascade collision theory and the difference between Ar+ and Ne+ sputtering mechanisms is discussed.  
          
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        发布时间：2021-04-09
      • Qian Xiangrong Chen Mingxing Chen Li Jin Huijuan Chen Lijun Xu Guiqin
        Issue 8, (1992)
        摘要：Sm20Fe70oTi10 samples were prepared by melt - spinning and subsequent crystallization. The intrinsic coercivity increases with the increase of quenching rate and the maximum value was 3. 2（1000/4π）kA/m. The combination of Mossbauer spectroscopy and X -ray diffaction has shown that the alloy consists of SmFe2 ,SmFe3, an undetermined paramagnetic phase and the minor phase of Sm2Fe17.  
          
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        发布时间：2021-04-09
      • Zeng Yiwei Lu Jiangang Yan Xiaohua Lin MingzhuMeng Xianren Wu Xiaoshan Tu Qingyun Lin Zhenjin
        Issue 8, (1992)
        摘要：Two main superconducting phases, 1223 and 2223 in TlBaCa3Cu3O8.5 superconductor, are identified by powder X - ray analysis and 57Fe Mossbauer spectroscopy analysis. The Mossbauer fitting results have shown that iron atoms in the lattice substitute for copper atoms at inequivalent sites for each main phase. The temperature dependence of Mossbauer parameters are obtained, and several problems are discussed about the electric charge transfer which takes place around the superconducting transition temperature, the lattice dynamics and the effect of oxygen deficiency at different temperatures.  
          
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        发布时间：2021-04-09
      • Jin Mingzhi Liu Xuewu Liu Milan
        Issue 8, (1992)
        摘要：EuBa2 （Cu1-xFex）3O1-y has been investigated by the 57Fe and 151Eu Mossbauer spec-troscopy. The 77Fe Mossbauer spectra of EuBa2（Cu1-xFex）3O7-y have been measured around the superconducting transition temperature without or with a DC electric current of 0. 5 A. The results indicate that isomer shift （IS） and quadrupole splitting （QS） of the Fe atoms replacing the Cu（2） sites vary neither with the Fe content nor with electric current passing through the superconductor while both IS and QS of the Fe atoms replacing the Cud) sites vary with the Fe content. In addition, IS and QS of the Fe（D3） atoms replacing the Cu（1） sites are different before and after a small electric current passes thorough the superconductor at 80 K.  
          
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        发布时间：2021-04-09
      • Chen Yilong Feng Xianyi Ouyang Bozhong Xu Binfu Wang Cailin
        Issue 8, (1992)
        摘要：The57 Fe Mossbauer study has been performed for the intercalated compound 2H-Fe0.5-TaSe2 over a temperature range between 14 and 500 K. The intercalation samples 2H -Fex-TaSe2 with high content of Fe（x up to 2）are prepared by electrochemical method for the first time. The Mossbauer measurement shows that iron is in high spin state of Fe3+ and occupies both octahedral and tetrahedral interstices of the Van der Waals gap with same probabitity. The fact that effective masses Meff of iron ions in both sites are close to 57 u and the characteristic temperatures are found to be relatively small （M = 130K, 109K respectively） is attributed to the weak forces on Fe3+.  
          
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        发布时间：2021-04-09
      • Li Yinhua Li Shi Wu Weifang Xu Yingting
        Issue 8, (1992)
        摘要：The Mossbaurer spectra, including both conversion electron and intrinsic X - ray backscatting and transmission ones , have been applied to study the layered structure of the high corrosion - resistant Fe - Zn electrodepositions. Especially the layered structure of the Fe - Zn alloy samples containing 18 % Fe has been revealed. The electrodepositing current density has been found no influence on the layer order. Thus some bases may be provided for obtaining high corrosion -resistant electrodepositions.  
          
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        发布时间：2021-04-09
      • Li Xuejun Chao Zhiyu Xiao Yanan Liu Yongzhong Chai Zhifang
        Issue 8, (1992)
        摘要：The X - ray fluorescence micro-scanning analysis of some typical regions in the Nandan iron meteorite was made by means of a synchronous radiation device and a rotating target X-ray generator. The micro -region distributions and quantitative results of As,Au, Ca, Co, Cr, Cu, Fe, Ga, Ge, Mn, Ni, Os, Pt, S, Se, Ti, V and Zn were given. The related expe -rimental technique was discussed.  
          
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        发布时间：2021-04-09
      • Qiu Zhaoming Rang Mei
        Issue 8, (1992)
        摘要：Baotite , first discovered in Baotou, Inner Mongolia, China and afterwards reported in Montana, U. S. A. , is a kind of tetracyclic Ba - Ti - Nb silicate and has low content of Fe （Fe2O3<3%）. The first report on its 57Fe Mossbauer spectrum is given in the paper . Two sets of quadrupole doublets are obtained from the spectrum. The A doublets is attributed to Fe3+ and the B doublet reflects Fe2+ in the Ti -O octahedra. Fe3+/Fe2+ = l. 32. The spectrum indicates that; （l）both Fe3+ and Fe2+ are present in baotite; （2）Fe3+ and Fe2+ exist as isomorphism in the octahedra; （3）the titanium octahedron is somewhat distorted, which is similar to the case of rutile; and （4）there may be a complicated structure in baotite crystal.  
          
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        发布时间：2021-04-09
      • Zhao Jingwu Su Weining Zhang Zhiping Liu Shengkang
        Issue 8, (1992)
        摘要：Neutron emission from an Am - Be neutron source can be treated as a process with a time interval between two neutrons. In a medium, according to the neutron field theory, different types of nuclear reactions between the source neutrons and the medium nuclei appear, which results in a specific time interval distribution. By determining the distribution, the information on the medium can be obtained. Experimental principles and apparatus are discussed.  
          
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        发布时间：2021-04-09
      • Huang Ningkang
        Issue 8, (1992)
        摘要：The principle and characteristics of the ion - electron - atom beams combination depos-tion technique are outlined. Morphology of the deposited films such as alloy, ceramic and their composite films is studied.  
          
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        发布时间：2021-04-09
      • Dong Yulan
        Issue 8, (1992)
        摘要：A method is described of preparing a - Fe thin film absorber samples by electron beam bombardment in a vacuum chamber. The film is about ≤50 nm thick, silverly -white and bright, and uniform. It has been successfully used in a depth - sensitive internal conversion electron Mossbauer spectrometer using the proportional counter.  
          
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        发布时间：2021-04-09
      • Kuang Jianwen Zhang Nianbao
        Issue 8, (1992)
        摘要：Tritiated berberine was prepared by heterogeneous catalysed exchange in newborn triti-ated water, using a metal hydrogen transfer catalyst such as Pd. After purifying, the tritiat-ed products was obtained with specific activity 36. 8 GBq/mmol. The radiochemical purity was over 95% by TLC and HPLC.  
          
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        发布时间：2021-04-09
      • Yang Jianzhong Tang Guozhong
        Issue 8, (1992)
        摘要：Tritiated dihydroartemisinine was obtained by reduction of artemisinine with NaBT4, Then it was reacted with nitrobenzoylchloride. The tritiated product was purified by silica gel loaded paper chromatography. The specific activity was 0. 11TBq/mmol.  
          
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        发布时间：2021-04-09
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