检索结果-南通市图书馆

Study on the thermal stability and electrical properties of the high-k dielectrics (ZrO_2) _x(SiO_2)_(1-x)

在线全文

学校读者我要写书评

暂无评论

Science china(Technological Sciences) 2009年第8期52卷 2222-2226页

作者： Lü ShiCheng1,2, YIN Jiang1,2, XIA YiDong2,3. GAO LiGang2,3.& LIU ZhiGuo2,3.1 department of physics, nanj.ng.university,{3., china 2 National laboratory of solid Sate microstructures, nanj.ng.university,{3., china 3.department of Materials Science and Engineering, nanj.ng.university,{3., china department of physics Nanjing University Nanjing China National laboratory of solid Sate microstructures Nanjing University Nanjing China department of Materials Science and Engineering Nanjing University Nanjing China

(ZrO2)x(SiO2)1-x (Zr-Si-O) films with different compositions were deposited on p-Si(100) substrates by using pulsed laser deposition technique. X-ray photoelectron spectra (XPS) showed that these films remained amorphous after annealing at 800℃ with RTA process in N2 for 60 s. The XPS spectra indi- cated that Zr-Si-O films with x=0.5 suffered no obvious phase separation after annealing at 800℃, and no interface layer was formed between Zr-Si-O film and Si substrate. While Zr-Si-O films with x >0.5 suffered phase separation to precipitate ZrO2 after annealing under the same condition, and SiO2 was formed at the interface. To get a good interface between Zr-Si-O films and Si substrate, Zr-Si-O films with bi-layer structure (ZrO2)0.7(SiO2)0.3.(ZrO2)0.5(SiO2)0.5/Si was deposited. The electrical properties showed that the bi-layer Zr-Si-O film is of the lowest equivalent oxide thickness and good interface with Si substrate.

关键词： high-k dielectric film pulsed laser deposition pseudo ternary alloy

Special magnetic phenomena in heavily doped La_(0.7-x)Dy_xSr_(0.3.MnO_3.system

在线全文

学校读者我要写书评

暂无评论

Science china(physics,Mechanics & Astronomy) 2008年第1期51卷 90-97页

作者： LIU Ning 1,2 ,YAN GuoQing 1,3.,CAI ZhiRang 1 ,PI Li 2 ,ZHAng Bei 2 &TOng Wei 2 1 department of physics,Suzhou College,Suzhou 23.000,china 2 Structure Research {3.,university of Science and Technology of china,Hefei 23.026,china 3.National {3. of solid state microstructures,physics department,{13.,nanj.ng.210093,china department of physics Suzhou College Suzhou China Structure Research laboratory University of Science and Technology of China Hefei China National laboratory of solid state {3. Physics Department Nanjing University Nanjing China

The magnetism in heavily Dy doped La0.7-xDyxSr0.3.nO3.0.40≤x≤0.70)system is studied in this *** M-T relation seems to be complicated with the increase of *** sample with x=0.40,AFM behavior exists at T≤TN and M-T curves under zero field cooling(ZFC)and field cooling(FC)exhibit typical behavior of spincluster glass state above *** the sample with x=0.50,the M-T curve under ZFC exhibits a valley at a low temperature while the M-T curve under FC exhibits the negative magnetization below *** samples with x=0.60,0.70,their ZFC M-T curves are similar to that of x=0.50,but the FC M-T curves do not exhibit negative values any *** the peculiar phenomena above are well explained by Néel double-lattice model combined with M-H relation at typical *** molecular field theory fits well the negative magnetization for x=0.50.

关键词： heavily doped special magnetic phenomena double-lattice model

Interfacial Tunnel-type GMR in Granular PerovskiteLa_(1-x)Sr_xMnO_3

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 1999年第4期15卷 373-374页

作者： Ning ZHAng and Minyu ZEng(department of physics, nanjing Normal {3., nanjing 210097, china)WeiPing DIng, Wei ZHOng and Youwei DU(National laboratory of solid state microstructures, nanj.ng.university, nanj.ng.210093, china)To whom correspondence sh department of physics Nanjing Normal University Nanjing 210097 China National laboratory of solid state {3. Nanjing University Nanjing 210093 China

The spin-dependent intedecial tunneling and the corresponding tunnef-type magnetoresistance (TMR) have been observed in granular perovskite La_(1-x)Sr_xMnO_3.with x from 0.05 to *** shows that the intedecial tunneling originates from the magnetic difference between thegrain core and the sudece, and the TMR stems from the field-induced change of magnetic orderin the interface.

关键词： Sr x)SrxMnO3 MnO GMR Interfacial Tunnel-type GMR in Granular PerovskiteLa type

Study on growth and properties of novel γ-LiAlO_2 substrate

在线全文

学校读者我要写书评

暂无评论

Science china(Technological Sciences) 2006年第2期49卷 188-193页

作者： ZOU Jun1,2, ZHOU Shengming1, XU Jun1 & ZHAng Rong3.1. Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, china 2. Graduate School of Chinese Academy of Sciences, Beijing 10003., china 3. laboratory of solid state microstructures and department of physics,{3., nanj.ng.210093, china Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai China Graduate School of Chinese Academy of Sciences Beijing China laboratory of solid state {3. and department of physics Nanjing University Nanjing China

Transparent γ-LiAlO2 single crystal has been grown by Temperature Gradient technique. The surface of the wafer annealed in O2-atmosphere at 1100°C for 70 h became opaque and Li-poor phase (LiAl5O8); while, that annealed in Li-rich atmosphere kept transparent and smooth. The full-width at half maximum value dropped to 3. arcsecs when the wafer was annealed in Li-rich atmosphere. That annealed in O2-atmosphere increased to 78 arcsec. Compared with absorption spectra, we can conclude that the 196 nm absorption peak was caused by Li vacancies and the 73. nm peak was caused by O vacancies.

关键词： γ-LiAlO2 crystal, scanning electron micrograph (SEM), absorption spectra.

DISTRIBUTION OF VORTEX BARRIERS AT DIFFERENT TEMPERATURES FOR TL 2212 FILM

在线全文

学校读者我要写书评

暂无评论

南京大学学报(自然科学) 1999年第4期35卷 500-501页

作者： Lin Fenyong Ding Shiying (National laboratory of solid state {3. and department of physics, nanj.ng.university,210093,nanjing,PRC) 南京大学物理系固体微结构物理国家重点实验室江苏

HARMONIC RESPONSE AND FLUX CREEP OF SUPERCONDUCTOR

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

南京大学学报(自然科学) 1999年第5期 634-635页

作者： Ding Shiying (department of physics,National laboratory of {3. state microstructures,nanj.ng.university, Center for Advance Studies in Science and Technology of microstructures,210093,nanjing, PRC)

ＨａｒｍｏｎｉｃＡＣｓｕｓｃｅｐｔｉｂｉｌｉｔｉｅｓａｓａｆｕｎｃｔｉｏｎｏｆｔｅｍｐｅｒａｔｕｒｅ（Ｔ），ＡＣｆｉｅｌｄｆｒｅｑｕｅｎｃｙ（ｆ），ａｍｐｌｉｔｕｄｅ（Ｂａｃ）ｉｎＤＣｆｉｅｄｌｄ（Ｂｄｃ）ｈａｖｅ... 详细信息

ＨａｒｍｏｎｉｃＡＣｓｕｓｃｅｐｔｉｂｉｌｉｔｉｅｓａｓａｆｕｎｃｔｉｏｎｏｆｔｅｍｐｅｒａｔｕｒｅ（Ｔ），ＡＣｆｉｅｌｄｆｒｅｑｕｅｎｃｙ（ｆ），ａｍｐｌｉｔｕｄｅ（Ｂａｃ）ｉｎＤＣｆｉｅｄｌｄ（Ｂｄｃ）ｈａｖｅｂｅｅｎｓｔｕｄｉｅｄｎｕｍｅｒｉｃａｌｌｙ．Ｔｈｅｎｕｍｅｒｉｃａｌｃａｌｃｕｌａｔｉｏｎｉｓｂａｓｅｄｏｎｎｏｎｌｉｎｅａｒｖｏｒｔｅｘｄｉｆｆｕｓｉｏｎ．Ｔｈｅｒｅｓｕｌｔｓｈｏｗｓｔｈａｔｔｈｅｒｅｅｘｉｓｔｓｓｅｃｏｎｄｈａｒｍｏｎｉｃａｌｔｈｏｕｇｈｖｅｒｙｗｅａｋｗｈｉｌｅｔｈｉｒｄｈａｒｍｏｎｉｃｉｓｓｔｒｏｎｇ．ＴｈｅｌｏｃａｔｉｏｎｏｆｔｈｉｒｄｈａｒｍｏｎｉｃｓｈｉｆｔｓｔｏｗａｒｄｌｏｗｔｅｍｐｅｒａｔｕｒｅｗｈｉｌｅｉｔｓｈｅｉｇｈｔｉｎｃｒｅａｓｅｓｗｉｔｈｅｉｔｈｅｒｄｅｃｒｅａｓｉｎｇｆｏｒｉｎｃｒｅａｓｉｎｇＢａｃ．ＴｈｅｓｅｎｕｍｅｒｉｃａｌｒｅｓｕｌｔｓａｒｅｉｎａｇｒｅｅｍｅｎｔｗｅｌｌｗｉｔｈｅｘｐｅｒｉｍｅｎｔａｌｏｂｓｅｒｖｅｄｆｏｒｔｅｘｔｕｒｅｄＹＢａ２Ｃｕ３Ｏ７ａｎｄｉｎｃｏｎｔｒａｓｔｗｉｔｈｐｒｅｄｉｃｔｉｏｎｏｆｔｈｅＢｅａｎｃｒｉｔｉ...

关键词： ac susceptibility superconductivity harmonics

FERROELECTRIC CHARACTERISTICS OF SrBi_2Ta_2O_9 THIN FILMS ANNEALED IN FORMIng GAS

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2001年第6期14卷 517-519页

作者： D.S. Wang, T. Yu and A. Hu (department of physics & National laboratory of {3. state microstructures, nanj.ng.university, nanj.ng.210093, china) D. Wu, A.D. Li, Z.G. Liu and N.B. Ming (department of Material Science and Engineering & National laboratory Dept. of Phys. Nanjing Univ. Nanjing 210093 China

The degradation behavior of SrBi2Ta2O9 (SBT) thin films annealed in forming gas (5%H2+95%N2) was investigated. The ferroelectric remnant polarization Px of SBT had a severe decrease in the containing H2 atmosphere at 400°C. SEM results showed that Bi could be reduced from SBT thin films for the effect of H2. The reduction role increased with a rise of annealing temperature. SBT thin films lost their ferroelectricity when the annealing temperature was above 450°C. It implied that the degradation of Pr value or the disappearance of ferroelectricity in SBT thin, films had the relationship with the reductive amounts of Bi in SBT. H2 played an important role in degradation of ferroelectric SBT thin films. This role could be attributed to its strong reduction activity during forming gas annealing.

关键词： Annealing Degradation Ferroelectricity Thermal effects

Structural phase transition in nanostructured γ-Fe_2O_3

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 1997年第11期42卷 894-897页

作者： YE Xisheng, SHA Jian, SOng Hongqin, JIAO Zhengkuan, LU Guanglie, PEng Zifei and ZHAng Lide1. department of physics, Zhejiang university, Hangzhou 3.0027,{3. 2. Central laboratory, Hangzhou university, Hangzhou 3.0028,{3. 3. Institute of solid state physics, Chinese Academy of Sciences, Hefei 23.03.,{3. department of physics Zhejiang IJniversity Hangzhou China Central laboratory Hangzhou University Harigzhou China Institute of solid state physics Chinese Academy of Sciences Hefei China

DUE to their specific physical,chemical and mechanical properties and large application proba-bility in many fields,nanostructured materials have been developing very fast in the recent *** stability is an important property of the *** interesting resultshave been obtained in the study of the thermal stability of nanostructured materials.

关键词： nanostructured γ-Fe2O3 differential thermal analysis (DTA) XRD microstructlire structural phase transition.

Optical Properties of One-dimensional Three-component Photonic Band Gap Structure

在线全文

学校读者我要写书评

暂无评论

The Journal of china Universities of Posts and Telecommunications 2003年第2期10卷 22-26,33页

作者： CAI Xiang bao (department of Applied Mathematics and physics, nanj.ng.university of Posts and Telecommunications, {3.ing 210003. P.R.china National laboratory of solid state microstructures, nanj.ng.university, nanj.ng.210093, P.R.china) department of Applied Mathematics and physics Nanjing University of Posts and Telecommunications Nanjing 210003

Theoretical study of the optical properties of one dimensional three component photonic band gap structure, which is composed of three alternating dielectric layers of different refractive indices and thickness in a unit cell, is performed. This one dimensional photonic band gap structure exhibits the transparency band and forbidden band. We find that there are several mini bands of the allowed transmission to be created within the photonic band gap region of the structure if a defect designed specially is introduced inside the structure. This characteristic is very important for some practical applications.

关键词： photonic crystal photonic band gap optical property forbidden band