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1.
利用离子束混合方法在Sm质量分数为20%的Sm-Fe多层薄膜中,当注入能量为60keV的N离子时,成功地制备出Sm-Fe-N磁性薄膜.经透射电镜(TEM)和X射线衍射(XRD)分析发现:当N离子的注入剂量为1×1017/cm2时,形成Sm2Fe17Nx磁性薄膜;而N离子的注入剂量为2×1017/cm2时,Sm-Fe多层薄膜转变成非晶磁性薄膜,而且Sm2Fe17Nx磁性薄膜和Sm-Fe-N非晶磁性薄膜的磁性(饱和磁性强度、矫顽力)与注入前的Sm-Fe薄膜相比有明显的提高  相似文献   

2.
Si^+和Ti^+注入H13钢注入层微观结构的研究   总被引:5,自引:0,他引:5  
利用透射电子显微镜,分析了Si^+(100keV,5×10^17cm^-2)和Ti(100keV,3×10^17cm^-2)注入H13钢注入微观结构的变化,结果表明,离子注入后板条状马氏体完全消失,Si^+注入导致注入层晶粒细化,而Ti注入导致注入层非晶化。  相似文献   

3.
通过正交试验,研究了N+注入参数对40Cr钢和GCr15钢表面显微硬度的影响。结果表明离子注入使40Cr钢和GCr15钢表面硬度得到了提高,且存在一个最佳注入剂量为4×1017ions/cm2。  相似文献   

4.
研究了n型多晶硅薄膜和铝的欧姆按触、整流接触。在掺杂浓度N≥2.9×1019 cm-3的情况下为欧姆接触:在掺杂浓度N≤2.9×1018cm-3的情况下为整流接触; 用TLM方法测出了N=2.9×1019cm-3时的接触电阻率ρc=5.54×10-3Ω.cm2; 从理论上定量地分析了掺杂浓度(1.4×1017~2.9×1019)cm-3的U-I特性曲线.理 论计算结果和实验数据符合较好.讨论了肖特基势垒高度φb和晶粒间界势垒高度φg 随掺杂浓度变化的规律,φb不随N变化,保持为常数;而φg却有极值。在实验 方面.探讨了用Ti代替A1实现低阻浅结欧姆接触的可能性。在掺杂浓度较低的情 况下,给出了制备欧姆接触的方法。  相似文献   

5.
应用电子能谱、X射线衍射及透射电镜等对四种不同注氮工艺下的Ti-6A1-4V 合金表面改性层的化学成分、显微组织及合金结构等进行了分析研究。结果表明:注 层中的氮离子分布随注入剂量的不同而异;在注层中形成了TiN,Ti2A2N 等新的 合金相,同时形成了层错、孪晶等缺陷.并从理论方面对改性层的强化机制进行了初 步探讨。  相似文献   

6.
高d33.g33值PZT压电陶瓷材料中Sb2O3掺杂的作用   总被引:3,自引:1,他引:3  
Sb2O3对Pb(Zr0.54Ti0.46)O3的掺杂改性具有调整材料四方度(c/a)的作用.实验表明,Sb2O3的适量添加可使材料四方度的调整达到一个较佳值,从而得到d33=570×10-12C/N、g33=32×10-3Vm/N的高压电活性的材料组成.该材料可获得各种重要应用  相似文献   

7.
铁离子注入单晶铜引发亚结构组态变化的研究   总被引:1,自引:0,他引:1  
用加速电压50kV、剂量为4×1017/cm2的铁离子注入单晶铜中,利用透射电子显微镜弱束成像技术研究了被注入材料的横截面样品,发现离子辐照引发被注入材料亚结构变化的深度远大于离子本身注入的深度,铁离子注入单晶铜中位错密度随注入深度的变化有两个峰值出现.其亚结构为多种位错组成的复杂位错组态,这种亚结构会使被注入材料具有相当于加工硬化的效果.探讨了离子注入材料中由辐照引发的加工硬化现象,即所谓的“长程效应”  相似文献   

8.
PEMSIP法Ti2N和TiN两相涂层工艺研究   总被引:2,自引:0,他引:2  
介绍了等离子体增强磁控溅射离子镀TiN涂层的工艺,组织结构和性能,研究了氮分压和靶功率对涂层相组成和性能的影响,讨论了Ti2N对涂层硬度的影响,实验结果表明,由Ti2N和TiN两相组成的涂层硬度高,显著提高刀具耐用度。  相似文献   

9.
讨论了离子注入表面改性技术在生物材料中的应用,研究了Ti-6Al-4V合金表面注入N+离子后的摩擦磨损行为,结果表明,Ti-6Al-4V经离子注入后,摩擦磨损性能都大幅提高.  相似文献   

10.
研究BaO-PbO-Bi2O3-Nd2O3-TiO2五元系统在800~1200℃烧结中物相变化和电性能.XRD测试数据:1000℃时BaTiO3消失,主晶相为BaTi4O9、Bi4Ti3O12和Nd2Ti2O7,BaNd2Ti5O14开始出现,1100℃到1150℃,Bi4Ti3O12在XRD图上消失,BaTi4O9和Nd2Ti2O7含量逐渐减少,BaNd2TiO14逐渐增加;1200℃时,XRD图谱全部为BaNd2Ti5O14,证明该系统的主晶相BaNd2Ti5O14是由Nd2O3、TiO2对具有微波特性的BaTi4O9改性而得:铅含量增加,主晶相的a、b二晶轴缩短.调整各组分及玻璃的含量,获得ε=90±5、损耗tgδ≤3×10-4、绝缘电阻ρv≥1012Ωcm、电容量温度系数αc=0±15×10-6/℃、中温(1150℃)烧结的NPOMLC瓷料.  相似文献   

11.
Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.  相似文献   

12.
何延凌 《科技信息》2008,(4):258-258
Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women's language from these perspectives: pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women's language, more attention should be paid to language use in social context. What's more, the linguistic phenomena in a speaking community can be understood more thoroughly.  相似文献   

13.
王慧 《科技信息》2008,(10):240-240
Wuthering Heights, Emily Bronte's only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.  相似文献   

14.
The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.  相似文献   

15.
理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。  相似文献   

16.
As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.  相似文献   

17.
Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.  相似文献   

18.
正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-  相似文献   

19.
We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-  相似文献   

20.
正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that  相似文献   

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