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Surface configurations during annealing of sputter-deposited NiTi thin films

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Chinese Science Bulletin 1997年第23期42卷 2019-2020页

作者： GONG Fengfei, JIANG Enyong, SHEN Huimin and WANG Yening1. Department of Applied Physics, Tianjin university, Tianjin 3.0072 The national laboratory of Solid {3. microstructures, nanjing university, nanjing 210008 Center for Advanced Studies in Science and Technology of microstructures, nanjing 210093. China 2. Department of Physics, Tianjin university, Tianjin 3.0072, China 3. national laboratory of Solid {3. microstructures, nanjing university, nanjing 210008, Center for Advanced Studies in Science and Technology of microstructures, nanjing 210093. China. Department of Applied Physics Tianjin University Tianjin The national laboratory of Solid state {3. Nanjing University Nanjing Center for Advanced Studies in Science and Technology of microstructures Nanjing China Department of Physics Tianjin University Tianjin China national laboratory of Solid state {3. Nanjing University Nanjing

SPUTTER-DEPOSITED NiTi thin films are becoming more and more important because of their po-tential applications to the intelligent thin-film systems. The as-deposited NiTi thin films pre-pared by magnetron sputtering are generally amorphous. Because the amorphous NiTi thinfilms cannot show shape memory effect, they should be crystallized under appropriate anneal-

关键词： NiTi Surface configurations during annealing of sputter-deposited NiTi thin films

Syntheses,crystal structures and properties of three novel coordination polymers with tripodal imidazole-containing ligands and benzenetetracarboxylate

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Science China Chemistry 2010年第10期53卷 2164-2169页

作者： SU Zhi, FAN Jian & SUN WeiYin state Key laboratory of Coordination Chemistry nanjing {3. laboratory of microstructures Coordination Chemistry Institute, School of Chemistry and Chemical Engineering, nanjing university, nanjing 210093. China 1. state Key laboratory of Coordination Chemistry nanjing national laboratory of {3. Coordination Chemistry Institute School of Chemistry and Chemical Engineering Nanjing University Nanjing 210093 China

Three novel coordination polymers, [Ni2(tib)2(btec)]·2H2O (1), [Co2(tib)2(btec)]·2H2O (2) and [Zn4(tib)2(btec)Cl4]·2H2O (3., have been synthesized by using mixed ligands of 1,3.5-tris(1-imidazolyl)benzene (tib) and 1,2,4,5-benzenetetracarboxylic acid (H4btec) under hydrothermal conditions. Complexes 1 and 2 have the same structure and are rare three-dimensional (3.) self-penetrating (3.4,5)-connected nets, while complex 3.is an unprecedented (3.4)-connected 3. net. The different structures of 1 (2) and 3.are ascribed to the distinct coordination geometry of the metal centers. The thermal stability and photoluminescence property of the complexes were investigated.

关键词： coordination polymer self-penetration crystal structure thermal stability photoluminescence property

Two bimetallic W(Ⅳ)-Mn(Ⅱ) complexes based on octacyanometallates:structures and magnetic properties

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Science China Chemistry 2009年第11期52卷 1801-1807页

作者： LIU BaoLin,XIAO HongPing,SONG You & YOU XiaoZeng state Key laboratory of Coordination Chemistry,nanjing {3. laboratory of microstructures,School of Chemistry and Chemical Engineering,nanjing university,nanjing 210093.China state Key laboratory of Coordination Chemistry Nanjing National Laboratory of Microstructures School of Chemistry and Chemical Engineering Nanjing University Nanjing China

Two cyano-bridged heterobimetallic coordination polymers,[{Mn(dpa)2}2W(CN)8·CH3.N·4H2O]n(1)(dpa = 2,2'-dipyridylamine) and [Mn2(H2O)4{W(CN)8}·3.2O]n(2),have been synthesized and characterized structurally and magnetically.X-ray analysis shows that complex 1 is a one-dimensional(1-D) polymer of W2(CN)4Mn2 square units in which adjacent square fragments are interlinked by sharing [W(CN)8]4-moieties to form an infinite *** 2 is a three-dimensional(3.D) polymer,which shows an unforeseen structure,exhibiting a 3.D open network with a 1-D channel(ca.13.21  × 11.82 ).Fitting of the magnetic properties indicates that both polymers exhibit weakly antiferromagnetic interactions between the adjacent Mn ions.

关键词： cyano-bridged coordination polymer magnetic property manganese(Ⅱ) complex

Study on the Relationship between Lamellar Spacing and Growth Rate inthe Regular Eutectic Growthby Monte-Carlo Simulation

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Journal of Materials Science & Technology 2002年第4期18卷 322-324页

作者： Weimin WANG, Junming LIU and Zhiguo LIUlaboratory of Solid state microstructures,{3., nanjing 210093. China laboratory of Solid state microstructures Nanjing University Nanjing 210093 China

A modified Monte-Carlo(MC) method to simulate the regular growth of binary eutectic alloys is presented. It is found that the growth rate has a linear dependence on the chemical potential difference between the solid and liquid; the relation between the lamellar spacing A and growth rate R accords well with the prediction of Jackson-Hunt(JH) theory unless the growth rate is very low.

关键词： Eutectic Monte-Carlo simulation Growth

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

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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, nanjing university, nanjing 210093. China 2 national {3. of Solid Sate microstructures, nanjing university, nanjing 210093. China 3.Department of Materials Science and Engineering, nanjing university, nanjing 210093. China 1. Department of Physics Nanjing University Nanjing 210093 China 2. national laboratory of Solid Sate microstructures Nanjing University Nanjing 210093 China 3. Department of Materials Science and Engineering Nanjing University Nanjing 210093 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

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

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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 university, nanjing 210097, China)WeiPing DING, Wei ZHONG and Youwei DU({3. laboratory of Solid state microstructures, nanjing university, nanjing 210093. China)To whom correspondence sh nanjing Normal Univ Dept Phys Nanjing 210097 Peoples R China nanjing Univ Natl Lab Solid State Microstruct Nanjing 210093 Peoples R 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

Preparation and Characterization of Nanocomposite MgFe_2O_4/SiO_2

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Journal of Wuhan university of Technology(Materials Science) 2009年第3期24卷 354-358页

作者：徐莉 College of Science Nanjing Forestry University

Nanocomposites MgFe2O4/SiO2 were successfully synthesized by the sol-gel method in the presence of N, N-dimethylformamide （DMF）. The formation of pure MgFe2O4 was confirmed by powder X-ray diffraction （XRD） and electron diffraction. The structural evolution of MgFe2O4 nanocrystals was followed by powder X-ray diffraction and IR absorption spectroscopy. The formation of spinel structure of MgFe2O4 started at 800 ℃, and completed at 900 ℃, The transmission electron microscopy （TEM） measurements suggest that the particle sizes increase with the increasing annealing temperature, and the mean particle sizes of the spherical samples annealed at 800 ℃, 900 ℃ and 1 050 ℃ are ca. 3.nm, 8 nm and 11 nm, respectively. Magnetization measurements at room temperature and 78 K indicate supemaramagnetic nature of these MgFe2O4 nanocrvstals.

关键词： nanocomposite sol-gel magnesium ferrite magnetic property

DEMAGNETIZATION EFFECT IN CRITICAL state IN CYLINDRICAL SUPERCONDUCTORS

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低温物理学报 1993年第3期 202-206页

作者： Ji Helin Jin Xin Ma Hui Yao XixianDepartment of Physics and national Lad. of Solid state microstructures,{3., nanjing 210008

This paper presents the results of field and current distribution in the critical state in a superconducting cylinder using Bean critical state model and isotropic critical current density Jc. We introduced an equivalent effective field and demagnetization factor Dc, and showed that Dc, from extremely long cylinder to very thin disks, is equal to Meissner demagnetization factor of the inscribed spheroid of the cylinder. The application of these parameters is discussed at the end of paper.

关键词： DEMAGNETIZATION EFFECT IN CRITICAL state IN CYLINDRICAL SUPERCONDUCTORS

Dendritic Deposition of NH_4CI Crystals with Free Surface as Simulations of Surface Solidification of Materials

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Journal of Materials Science & Technology 1993年第4期9卷 283-288页

作者： Junming LIU Zhiguo LIU Zhuangchun WU national Lab.of Solid state microstructures,{3. university,{3. 210008,China

As a simulation of surface solidification of materials,quasi-two dimensional dendritic deposition of ammonium chloride(NH_4Cl)crystals from an aqueous solution film with free surface by vapourization was investigated by the in- situ observation *** depositing morphologies of NH_4Cl crystals are faceted and of growth laws differing from the three-dimensional *** low supersaturation,faceted dendrites formed,whereas the anisotropy in growth kinetics decreases with the increase of *** vapourizing rate(supersaturation)is not very low, oscillations of growth ***-radius and second arm spacing of the dendrites were *** is suggested that this dynamic phenomenon is attributed to the correlation between the convection-transfer effect induced by the surface tension gradient of solution *** the driving force for deposition.

关键词： surface deposition dendrite surface tension oscillation