共查询到19条相似文献,搜索用时 93 毫秒
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采用在等离子体增强化学汽相沉积系统中沉积a-Si:H和原位等离子体逐层氧化的方法制备a-Si:H/SiO2多层膜.改变a-Si:H层的厚度,首次在室温下观察到来自a-Si:H/SiO2多层膜较强的蓝色光致发光和从465到435nm的蓝移.x射线能谱证明,SiO2层是化学配比的SiO2;C-V特性表明,a-Si:H/SiO2界面得到了很好的钝化;透射电子显微镜表明,样品形成了界面陡峭的多层结构.结合光吸收谱和光致发光谱的研究,对其发光机理进行了讨论.用一维量子限制模型对光致发光峰随着a-Si:H层厚度的减小
关键词:
a-Si:H/SiO2多层膜
光致发光 相似文献
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用掠入射X射线衍射及X射线反射对磁控溅射制取的等原子比Ni/Ti周期性多层膜晶化热处理 后的TiNi形状记忆薄膜室温微结构进行了研究.TiNi形状记忆薄膜在深度方向的相分布和元 素分布是不均匀的,都是一种多层结构.室温下其微结构特征为最外层是Ti氧化膜,再下层 是Ti3Ni4,B19’马氏体相和少量的B2奥氏体相的三相混合物,靠近 基体为主要相成分马氏体,最后是Ni和Si界面反应层.X射线反射率的拟和结果显示薄膜微结 构的分析是合理的.薄膜中相深度分布的不均匀性主要是动力学因素决定的.
关键词:
相深度分布
形状记忆
TiNi
多层膜 相似文献
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采用射频磁控溅射方法, 在混合气氛下制备了ZrN/TaN多层膜. 利用X射线衍射、慢正电子束分析、增强质子背散射、扫描电子显微镜, 分别对ZrN/TaN多层膜中相结构、氦相关缺陷、氦含量、截面形貌等进行了分析. 结果表明, 调制周期为30 nm的ZrN/TaN多层膜在600℃退火后, 氦的保持率仍能达到45.6%. 在适当的调制周期下, ZrN/TaN多层膜能够耐氦损伤并且其界面具有一定的固氦性能.
关键词:
ZrN/TaN
纳米多层膜
界面
固氦 相似文献
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采用磁控溅射方法制备了周期数分别为10,30,50和75的Ni/Ti多层膜,利用X射线掠入射反射测量了多层膜表面和界面的状态,并用原子力显微镜测量了多层膜的表面粗糙度,研究了不同周期数的Ni/Ti多层膜表面粗糙度的变化规律。结果表明:Ni/Ti多层膜表面粗糙度随着膜层数增加而增加,当Ni/Ti多层膜的周期数从10变化到75时,其表面粗糙度由0.80 nm增大到1.69 nm。实验数据拟合表明:Ni/Ti多层膜表面粗糙度与周期数成3次方关系;但在周期数较小时,粗糙度与周期数成线性关系。 相似文献
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利用射频反应磁控溅射方法,制备了调制比约为4,调制周期不同的一系列TiN/ZrN纳米多层膜. 利用X射线衍射仪(XRD)、高分辨电子显微镜(HRTEM)和纳米压痕仪(Nanoindentation)对多层膜的调制结构、界面状态和力学性能进行了表征. 研究结果表明TiN/ZrN多层膜具有很好的调制结构,但是在TiN层和ZrN层之间存在一定厚度的界面混合层. 力学性能分析表明:当调制周期小于15 nm时,TiN/ZrN多层膜的硬度介于单一TiN和ZrN薄膜的硬度之间;当调制周期为15.24 nm时,硬度达到最大,但随着调制周期增加,多层膜的硬度基本上保持为常数. 分析了TiN/ZrN多层膜硬度变化的机制,认为界面厚度和择优取向是导致硬度变化的主要原因.
关键词:
TiN/ZrN多层膜
界面宽度
择优取向
硬度变化 相似文献
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Q. Zhang W.S. Lai G.W. Yang B.X. Liu 《The European Physical Journal B - Condensed Matter and Complex Systems》2000,16(2):223-231
An embedded-atom potential for the Ni-Nb system is constructed using physical properties obtained from first-principle calculations.
Employing the potential, molecular-dynamics simulations are performed to study the interfacial reaction in Ni/Nb multilayers
upon annealing at medium temperatures. The results show that a preset disordered interlayer, which is obtained by exchanging
Ni and Nb atoms in the interfaces, may act as a nucleus of amorphous phase and is usually necessary for amorphization. It
is found that the growth of the amorphous interlayer is in a planar mode and exhibits an asymmetric behavior due to a faster
consumption of Ni than that of the Nb layer; this is also indeed observed experimentally. Moreover, performing a simulation
with solid solution models, it is found that the Nb lattice can accommodate a large number of Ni atoms and still retain a
crystalline structure, while a small amount of Nb atoms induce a spontaneous decay of the Ni lattice. Such differences in
solid solubility is thought to be the physical origin of the asymmetric growth observed in experiments and simulations.
Received 7 June 1999 and Received in final form 12 January 2000 相似文献
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The amorphization of Fe−Zr multilayers due to ion-beam mixing and solid state reaction is studied in detail using the CEMS
and CXMS. The nature of the amorphous Fe−Zr phase produced by both processes is the same suggesting that diffusion of Fe is
an important mechanism during ion-beam mixing. 相似文献
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Recent investigations claimed the complete amorphization of elemental FeZr multilayer films by solid state reaction during vacuum annealing. In the present study it is established by57Fe conversion electron Mössbauer spectroscopy (CEMS) that annealing under ultrahigh vacuum conditions does not lead to complete amorphization: only a maximum thickness of ≈14 Å interfacial α-Fe is transfered into the amorphous phase between 620–660 K. This thin amorphous layer apparently acts as a diffusion barrier and prohibits further growth of the amorphous phase. The average composition of the amorphous interfacial layer was determined from the Mössbauer spectral parameters. 相似文献
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A theoretical model is proposed which treats the diffusion-induced decay of fragment boundary disclinations as being a micromechanism for the solid state amorphization in mechanically alloyed materials. Within the framework of the suggested model the kinetics of amorphous-phase nucleation centres (spread cores of the decayed disclinations) is studied. In doing so, kinetic equations are suggested and solved, which describe the evolution of the radius of the amorphous core of the decayed disclination. 相似文献
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Tadashi Suzuki Takao Miyazaki Nobuyoshi Natsuaki 《Applied Physics A: Materials Science & Processing》1990,50(3):265-267
The origin of the ion beam mixing effect, which causes the formation of smooth silicide films, is investigated for the Ti/Si solid-phase silicidation reaction. Ge ion beam mixing of a conventional Ti/c-Si structure with an oxide-contaminated interface shows an obvious effect when the implant conditions are such that the Ti/Si interface is amorphized. On the other hand, silicidation without ion mixing for Ti/a-Si and Ti/c-Si structures with oxide-free interfaces, prepared by sequential deposition in UHV, results in smooth and rough film surfaces, respectively. This strongly suggests that the ion beam mixing effect primarily comes from the amorphization of the Si substrate surface rather than the destruction of the interfacial oxide film. 相似文献
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运用Miedema参数和尺寸因子R分别构成Miedema参数坐标和三维化学坐标成功地研究机械合金化二元过渡金属非晶合金的形成规律。基于实验事实所确定的机械合金化二元非晶的形成条件分别是见原文,以上两判据区分机械合金化非晶态合金形成与否的准确度分别为80%和88%。从微观原子的相互作用以及固态反应非晶化热力学和动力学的角度分析了以上参数在描述机械合金化二元过渡族合金体系非晶形成规律的内在物理涵义以及与固态反应非晶化实现所需条件的联系。
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C. VillevieilleC.M. Ionica-Bousquet A. De BenedettiF. Morato J.F. PiersonP. Simon L. Monconduit 《Solid State Ionics》2011,192(1):298-303
Self-supported nickel antimonides/Ni architectured electrodes were prepared by solid state reaction from Ni thin film, Ni foam and Ni nanorods. This specific design is expected to optimize both NiSbx/Ni-current collector and NiSbx/electrolyte interfaces of the electrode in the Li ion battery. This new electrode preparation process is based on solid state reaction of antimony with the nickel architectured substrate. Preliminary electrochemical tests of the as-obtained self supported antimonide electrodes show improvement in the capacity retention of the NiSbx active material. 相似文献