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1.
将V2O5粉体与WO3粉体均匀混合并压制成靶,用离子束增强沉积加后退火技术在SiO2衬底上制备掺钨VO2多晶薄膜.X射线衍射表明,薄膜取向单一,为VO2结构的[002]相,晶格参数d比VO2粉晶增大约0.34%;薄膜从半导体相向金属相转变的相变温度约28;室温(300 K)时的电阻-温度系数(TCR)可大于10%/K,是目前红外热成像薄膜TCR的四倍.W离子的半径大于V离子的半径,W的掺入在薄膜中引入了张应力,使薄膜相变温度降低到室温附近,是IBED V0.97W0.03O2薄膜的室温电阻温度系数提高的原因.
关键词:
二氧化钒薄膜
薄膜掺杂
离子束增强沉积 相似文献
2.
采用脉冲激光沉积技术制备了SrTiO3和SrNb0.2Ti0.8O3薄膜.X射线衍射分析表明在LaAlO3(100)单晶平衬底上生长的SrTiO3及SrNb0.2Ti0.8O3薄膜是沿[001]取向的近外延生长.随着氧压在一定范围内逐渐增大,SrTiO3薄膜的晶格参数减小,而SrNb0.2Ti0.8O3薄膜的晶格参数先减小后增大.同时摸索出制备具有二维电子气超晶格(SrTiO3/SrNb0.2Ti0.8O3)L的最佳氧压为1.0×10-2Pa.另外在LaAlO3(100)倾斜衬底上制备的SrNb0.2Ti0.8O3薄膜中观察到激光感生热电电压效应.
关键词:
0.2Ti0.8O3薄膜')" href="#">SrNb0.2Ti0.8O3薄膜
晶格参数
激光感生热电电压
脉冲激光沉积 相似文献
3.
采用磁控溅射工艺制备了V2O5薄膜.通过改变制备工艺中基片温度和氧分压两个条件,研究了薄膜的晶相组成、表观形貌以及氧化物中钒和氧元素的化合价态.当基片温度升高时,V2O5薄膜中颗粒结晶由细长针状转变为平行于基片的片状,V5+状态保持不变,但723 K时氧结合能向高键能态移动.氧分压较低时,薄膜表面有部分V4+态存在,但存在较多的高键能氧,此时薄膜中晶粒尺寸较小.随着氧分压的提
关键词:
氧化钒
磁控溅射
相变薄膜
X射线光电子能谱 相似文献
4.
室温下采用射频磁控溅射法,在硅衬底上制备了Y2O3-TiO2氧化物复合薄膜.利用XRD(X-ray diffraction)和AFM( atomic force microscopy)分析观察了退火前后样品的物相、形貌等变化,讨论了致密薄膜的生长机理.实验发现,溅射功率越大,薄膜的平整度和致密度越好.对热处理前后样品的结晶结构和表面形貌的分析结果显示,在本实验参数范围内,随着溅射功率的增大,更多的Y2O3
关键词:
2O3-TiO2薄膜')" href="#">Y2O3-TiO2薄膜
表面形貌
原子力显微镜
磁控溅射 相似文献
5.
采用射频反应溅射法于室温下在Cu/Ti/SiO2/Si基底上制备了氧化钒薄膜. X-射线衍射、X射线光电子能谱分析仪及原子力显微镜结果表明, 室温下制备的氧化钒薄膜除微弱的V2O5 (101)和V2O3 (110)峰外, 没有明显的结晶取向, 是VO2, V2O5, V2O3及VO的混合相薄膜, 且薄膜表面颗粒大小均匀, 表面均方根粗糙度约为1 nm. 采用半导体参数分析仪对薄膜的电开关特性进行测试. 结果表明薄膜具有较低的开关电压(VSet<1 V, VReset<-0.5 V), 并且具有稳定的可逆开关特性. 薄膜从低阻态转变为高阻态的电流(IReset)随限流的增大而增大.通过高低阻态时I-V对数曲线的拟合(高阻态斜率>1, 低阻态斜率=1), 认为Cu离子在薄膜中扩散形成的导电细丝是该体系发生电阻转变的主要机制.
关键词:
氧化钒薄膜
电阻开关
电阻式非挥发存储器
导电细丝 相似文献
6.
在室温条件下利用溅射Ta2O5靶材的方法制备了Ta2O5薄膜,并采用将薄膜两侧的反射率光谱进行比较的简便方法分析评估薄膜的光吸收,发现溅射制备薄膜的额外光吸收源是溅射引起的缺氧形成的,选择适当的溅射功率和含氧比例的工作气体能有效地消除这些缺陷、不用任何加温处理就可制备得到表面平坦和高致密度的高品质Ta2O5薄膜.
关键词:
2O5薄膜')" href="#">Ta2O5薄膜
光吸收
表面形貌
磁控溅射 相似文献
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10.
通过非平衡磁控溅射的方法制备了不同V含量的(Zr,V)N复合薄膜, 采用EDS, XRD, XPS, 纳米压痕仪和摩擦磨损仪等对薄膜的化学成分、微结构、力学性能及摩擦性能进行了研究. 结果表明, V的加入虽未改变ZrN的fcc晶体结构, 但使薄膜的择优取向由ZrN的(200)面转变为(Zr,V)N的(111)面. 随着V含量增加, (Zr,V)N复合膜的硬度略有升高后缓慢降低, 并在含25.8 at.%V后迅速降低. 与此同时, 薄膜的常温摩擦系数亦有小幅降低. 高温摩擦研究表明, (Zr,V)N薄膜在300 ℃时出现V2O3, V2O5 在500 ℃后形成, 其含量也随温度的提高而增加. 薄膜的摩擦系数因V2O5 的形成而得到显著降低.
关键词:
(Zr,V)N 薄膜
微结构
力学性能
摩擦性能 相似文献
11.
12.
ICP-AES测定微硅粉中Ca、Mg、Fe和Al的含量 总被引:1,自引:0,他引:1
微硅粉样品经氢氟酸、硝酸、高氯酸消解,电感耦合等离子体-原子发射光谱法(ICP-AES)测定Ca、Mg、Fe、Al杂质元素含量。方法的回收率为:Ca 95.2%—100.3%,Mg 96.2%—99.6%,Fe 95.8%—97.2%,Al 98.6%—104.6%,精密度在1.50%—2.59%之间。本方法线性范围宽、分析效率高、具有良好的准确性和精密度,能快速准确地测定微硅粉中Ca、Mg、Fe和Al杂质元素的含量。 相似文献
13.
Ehrlich H Koutsoukos PG Demadis KD Pokrovsky OS 《Micron (Oxford, England : 1993)》2008,39(8):1062-1091
In contrast to biomineralization phenomena, that are among the most widely studied topics in modern material and earth science and biomedicine, much less is systematized on modern view of demineralization. Biomineralized structures and tissues are composites, containing a biologically produced organic matrix and nano- or microscale amorphous or crystalline minerals. Demineralization is the process of removing the inorganic part, or the biominerals, that takes place in nature via either physiological or pathological pathways in organisms. In vitro demineralization processes, used to obtain mechanistic information, consist in the isolation of the mineral phase of the composite biomaterials from the organic matrix. Physiological and pathological demineralization include, for example, bone resorption mediated by osteoclasts. Bioerosion, a more general term for the process of deterioration of the composite biomaterials represents chemical deterioration of the organic and mineral phase followed by biological attack of the composite by microorganisms and enzymes. Bioerosional organisms are represented by endolithic cyanobacteria, fungi, algae, plants, sponges, phoronids and polychaetes, mollusks, fish and echinoids.In the history of demineralization studies, the driving force was based on problems of human health, mostly dental caries. In this paper we summarize and integrate a number of events, discoveries, milestone papers and books on different aspect of demineralization during the last 400 years. Overall, demineralization is a rapidly growing and challenging aspect of various scientific disciplines such as astrobiology, paleoclimatology, geomedicine, archaeology, geobiology, dentistry, histology, biotechnology, and others to mention just a few. 相似文献
14.
B. I. Stepanov Institute of Physics, Academy of Sciences of Belarus, 70, F. Skorina Ave., Minsk, 220072, Belarus. Translated
from Zhurnal Prikladnoi Spektroskopii, Vol. 62, No. 2, pp. 200–205, March–April, 1995. 相似文献
15.
In trace Li analysis with degenerate four-wave mixing (DFWM) method, acid anions and major metallic elements are dominant interferences in Li-eontaining samples. To better use DFWM technique to analyze trace Li in actual samples, we study their effects on Li DFWM signal intensity. It is found that K, Cs, and Ni can enhance the Li DFWM signal, SO4^2, PO^34-, Cl-, and Ca can cause significant suppression, and NO3-, Mg, Ba, Sr, and Na almost have no effects. Finally, we use HaBOa to eliminate the depressive effects of chlorides on Li DFWM signal. The result is also of reference in other trace elements analysis with DFWM. 相似文献
16.
A. I. Akimov A. N. Baranov L. V. Levshin A. M. Saletskii 《Journal of Applied Spectroscopy》1996,63(2):188-193
M. V. Lomonosov Moscow State University, Vorob'yovy Gory, Moscow, 119899, Russia. Translated from Zhurnal Prikladnoi Spektroskopii,
Vol. 63, No. 2, pp. 236–241, March–April, 1996. 相似文献
17.
Huang Ji-Ping 《物理学进展》2018,38(6):220
因为在热保护、热探测和热管理领域存在重要的应用价值,自由操控宏观热流一直是人类的
一个梦想。热超构材料正是为此目的应运而生,它是电磁超构材料在热学领域的延伸。在此,我将
综述该领域自2008 年诞生以来取得的若干研究进展,其将主要包括以下新奇热现象或功能器件:
热隐身;热聚集;热旋转;宏观热二极管;热伪装;热透明;热晶体;环境温差中零能耗保温;宏
观热网络中反常热传导;热对流隐身、聚集、伪装;热辐射制冷。我将介绍与之相关的微观或宏观
传热机制,这些机制可以通过以下理论或方法来理解或阐述:变换热学理论、Laplace 方程、热声
子能带理论、相变理论、变换热对流理论、热辐射制冷理论。我也将介绍这些材料从基础研究到工
业应用的发展前景。 相似文献
18.
Iain A. Neil 《Optical Review》2001,8(4):214-217
A series of high performance zoom lens objectives developed by Panavision over fifteen years, which are very popular in the motion picture (cine) industry, are described. Various aspects of four cine zoom lenses, including; definitions, development, specification, construction, aberrations and tolerances, are discussed.This paper was originally presented at the 2nd International Conference on Optical Design and Fabrication, ODF2000 which was held on November 15-17, 2000 at the International Conference Center, Tokyo, Waseda University, Japan. 相似文献
19.
Stable-plasma generators, spectroscopic measuring equipment, and methods for determining the optical properties of an extremely
heated medium with a given composition have been developed. The spectral coefficients of absorption and emission of heated
air, carbon dioxide, and argon were studied. A comparison with the data of other theoretical and experimental investigations
has been performed.
Deceased.
Institute of Molecular and Atomic Physics of the Academy of Sciences of Belarus, 70, F. Skorina Ave., Minsk, 220072, Belarus.
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 64, No. 6, pp. 818–826, November–December, 1997. 相似文献