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Relevant bibliographies by topics / Crystal structures; Superlattices

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Academic literature on the topic 'Crystal structures; Superlattices'

Author: Grafiati

Published: 4 June 2021

Last updated: 9 February 2022

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Journal articles on the topic "Crystal structures; Superlattices"

1

Quotane, Ilyasse, El Houssaine El Boudouti, and Bahram Djafari-Rouhani. "Graphene-Based One-Dimensional Terahertz Phononic Crystal: Band Structures and Surface Modes." Nanomaterials 10, no. 11 (2020): 2205. http://dx.doi.org/10.3390/nano10112205.

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In this paper, we provide a theoretical and numerical study of the acoustic properties of infinite and semi-infinite superlattices made out of graphene-semiconductor bilayers. In addition to the band structure, we emphasize the existence and behavior of localized and resonant acoustic modes associated with the free surface of such structures. These modes are polarized in the sagittal plane, defined by the incident wavevector and the normal to the layers. The surface modes are obtained from the peaks of the density of states, either inside the bulk bands or inside the minigaps of the superlatti

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Meduňa, Mojmír, Claudiu V. Falub, Fabio Isa, et al. "Reconstruction of crystal shapes by X-ray nanodiffraction from three-dimensional superlattices." Journal of Applied Crystallography 47, no. 6 (2014): 2030–37. http://dx.doi.org/10.1107/s1600576714023772.

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Quantitative nondestructive imaging of structural properties of semiconductor layer stacks at the nanoscale is essential for tailoring the device characteristics of many low-dimensional quantum structures, such as ultrafast transistors, solid state lasers and detectors. Here it is shown that scanning nanodiffraction of synchrotron X-ray radiation can unravel the three-dimensional structure of epitaxial crystals containing a periodic superlattice underneath their faceted surface. By mapping reciprocal space in all three dimensions, the superlattice period is determined across the various crysta

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3

Demczyk, B. G., and S. F. Cheng. "Structures of Zr2Co11 and HfCo7 intermetallic compounds." Journal of Applied Crystallography 24, no. 6 (1991): 1023–26. http://dx.doi.org/10.1107/s0021889891007331.

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The crystal structures of Zr2CO11 and HfCo7 intermetallic compounds were examined by transmission electron microscopy using both selected-area and convergent-beam electron diffraction. Results show that both have an orthorhombic crystal structure, space group Pcna. The unit cells of both compounds appear to be comprised of two long-period superlattices in antiphase relation to one another along [001].

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Pike, W. T., T. George, M. A. Khan, and J. N. Kuznia. "Transmission Electron Microscopy of AlxGa1-xN/SiC multilayer structures." Proceedings, annual meeting, Electron Microscopy Society of America 52 (1994): 844–45. http://dx.doi.org/10.1017/s042482010017195x.

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The potential of wide-band-gap III-V nitrides as solar-blind ultraviolet sensors and light emitters has prompted an increasing amount of work recently, including the fabrication of the first UV sensors from as-deposited single crystal GaN. We have used high resolution transmission electron microscopy (TEM) to study the microstructure of two novel developments of wideband-gap III-V nitrides: the growth of ultra-short period GaN/AlN superlattices (digital alloys); and the incorporation of SiC layers into AlxGa1-xN structures. By varying the relative periods in a GaN/AIN superlattice, it should b

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5

Wei, Jingjing, Nicolas Schaeffer, and Marie-Paule Pileni. "Ligand Exchange Governs the Crystal Structures in Binary Nanocrystal Superlattices." Journal of the American Chemical Society 137, no. 46 (2015): 14773–84. http://dx.doi.org/10.1021/jacs.5b09959.

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Kuwano, Noriyuki, Masaru Itakura, and Kensuke Oki. "Long-period modulated superstructures in Pd-12.5 at.%Ce and Pd-15 at.%Ce alloys." Proceedings, annual meeting, Electron Microscopy Society of America 48, no. 4 (1990): 164–65. http://dx.doi.org/10.1017/s0424820100173959.

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Pd-Ce alloys exhibit various anomalies in physical properties due to mixed valences of Ce, and the anomalies are thought to be strongly related with the crystal structures. Since Pd and Ce are both heavy elements, relative magnitudes of (fcc-fpd) are so small compared with <f> that superlattice reflections, even if any, sometimes cannot be detected in conventional x-ray powder patterns, where fee and fpd are atomic scattering factors of Ce and Pd, and <f> the mean value in the crystal. However, superlattices in Pd-Ce alloys can be analyzed by electron microscopy, thanks to the high

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7

Cahill, David G., Kenneth Goodson, and Arunava Majumdar. "Thermometry and Thermal Transport in Micro/Nanoscale Solid-State Devices and Structures." Journal of Heat Transfer 124, no. 2 (2001): 223–41. http://dx.doi.org/10.1115/1.1454111.

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We review recent advances in experimental methods for high spatial-resolution and high time-resolution thermometry, and the application of these and related methods for measurements of thermal transport in low-dimensional structures. Scanning thermal microscopy (SThM) achieves lateral resolutions of 50 nm and a measurement bandwidth of 100 kHz; SThM has been used to characterize differences in energy dissipation in single-wall and multi-wall carbon nanotubes. Picosecond thermoreflectance enables ultrahigh time-resolution in thermal diffusion experiments and characterization of heat flow across

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8

FALCO, CHARLES M., and BRAD N. ENGEL. "PROPERTIES OF MBE-GROWN SUPERLATTICES AND ULTRA-THIN FILMS." International Journal of Modern Physics B 07, no. 01n03 (1993): 446–51. http://dx.doi.org/10.1142/s0217979293000937.

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We have used Molecular Beam Epitaxy (MBE) to grow single-crystal Co/Pd superlattices and Co/TM (TM=Cu, Pd, Ag) bilayers and sandwiches along the three high-symmetry crystal directions; [001], [110], and [111]. In the case of Co/Pd superlattices, we previously reported from x-ray diffraction measurements that for small Co thicknesses the (001) oriented superlattices are coherently strained in-plane to near the bulk Pd lattice spacing. This strain leads to a very large in-plane magnetoelastic volume anisotropy for these superlattices. Here we report quantitative in situ RHEED measurements of Co

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LEBEDEV, ALEXANDER I. "DIELECTRIC, PIEZOELECTRIC, AND ELASTIC PROPERTIES OF BaTiO3/SrTiO3 FERROELECTRIC SUPERLATTICES FROM FIRST PRINCIPLES." Journal of Advanced Dielectrics 02, no. 01 (2012): 1250003. http://dx.doi.org/10.1142/s2010135x12500038.

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The effect of epitaxial strain on the phonon spectra, crystal structure, spontaneous polarization, dielectric, piezoelectric, and elastic properties of (001)-oriented ferroelectric ( BaTiO 3)m/( SrTiO 3)n superlattices (m = n = 1-4) was studied using the first-principles density functional theory. The ground state of free-standing superlattices is the monoclinic Cm polar phase. Under the in-plane biaxial compressive strain, it transforms to tetragonal P4mm polar phase, and under the in-plane biaxial tensile strain, it transforms to orthorhombic Amm2 polar phase. When changing the in-plane latt

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Righi, Lara, Franca Albertini, Simone Fabbrici, and Antonio Paoluzi. "Crystal Structures of Modulated Martensitic Phases of FSM Heusler Alloys." Materials Science Forum 684 (May 2011): 105–16. http://dx.doi.org/10.4028/www.scientific.net/msf.684.105.

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Multifunctional ferromagnetic shape memory Heusler alloys are frequently characterized by structural modulation in martensitic phases. In particular, modulated martensitic phases, showing the higher magnetic field induced strain (MFIS) performance, are the most promising candidates for technological applications. Depending on the composition, as well as pressure and temperature conditions, this periodic structural distortion, consisting of shuffling of atomic layers along defined crystallographic directions, accompanies the martensitic transformation. Over the years, different Ni-Mn-Ga modulat

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Dissertations / Theses on the topic "Crystal structures; Superlattices"

1

Allen, Elizabeth D. "Diffusion through strained semiconductors." Thesis, University of Nottingham, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.267629.

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Rasul, Faiz. "Theoretical investigation of diffusion in bulk material and superlattice structures." Thesis, University of Hull, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.310279.

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Blair, John L. "Optical properties of the square superlattice photonic crystal structure and optical invisibility cloaking." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/37112.

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The refraction properties of photonic crystal lattices offers methods to control the beam steering of light through use of non-linear dispersion contours. In this thesis new photonic crystal structures, such as the square and triangular superlattices, that provide novel refractive properties are analyzed. The property difference between rows in these structures is the hole radius Δr. The difference in hole sizes leads to observation of the superlattice effect, that is, a change in the refractive index Δn between opposite rows of holes. The index difference becomes a function of the size of

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Parry, Bryn Hughes. "A structural study of the Biâ†2Oâ†3 - TeOâ†2 system using diffraction and imaging techniques." Thesis, Cardiff University, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.254518.

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Jin, Yabin. "Design of acoustic artificial structured materials : piezoelectric superlattice, gradient index lens, pillar based phononic crystal plate." Thesis, Lille 1, 2017. http://www.theses.fr/2017LIL10011/document.

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Les cristaux phononiques et métamatériaux acoustiques sont des matériaux structurés artificiels qui fournissent un moyen prometteur pour manipuler les ondes acoustiques avec de nombreuses applications potentielles nouvelles. Après une introduction à l'état de l'art, le chapitre 2 propose des multicouches actives à base de structures piézoélectriques résonnantes. Leur transmission et leurs propriétés effectives peuvent être contrôlées activement en changeant les conditions électriques. Le chapitre 3 développe des méthodes d'homogénéisation pour une plaque de cristal phononique et montre pour la

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Gardner, N. J. G. "Structure and dynamics of superionic conductors at high temperatures and high pressures." Thesis, University of Oxford, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.325955.

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Arlery, Magali. "Etude par microscopie électronique à transmission de couches et structures semi-conductrices GaN/AlxGa(1-x)N." Université Joseph Fourier (Grenoble), 1998. http://www.theses.fr/1998GRE10047.

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Nous presentons une etude structurale de depots epais de gan sur alumine et d'heterostructures gan / al#xga#1#-#xn de basse dimensionnalite. Les systemes etudies ont ete elabores par epitaxie par jet moleculaire (mbe) ou par depot en phase vapeur d'organo-metalliques (mocvd). La technique d'investigation est la microscopie electronique a transmission, utilisee en modes conventionnel, haute resolution et faisceau convergent. La premiere partie de l'etude traite de la croissance optimisee de couches de gan sur substrat d'alumine. La polarite des depots est le parametre clef de cette croissance.

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Dal'Bo, Frédéric. "Spectroscopie optique d'heterostructures a base de tellurure de cadmium epitaxiees par jets moleculaires." Grenoble 1, 1988. http://www.theses.fr/1988GRE10123.

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La relaxation des contraintes est mise en evidence par une etude spectroscopique des transitions des excitons libres et varie en fonction de l'epaisseur de la couche et de l'orientation du support. Les differences entre les spectres de photoluminescence des materiaux massifs et ceux des couches epitaxiees sont dues aux effets des contraintes, aux defauts cristallins et aux impuretes introduites pendant la croissance. La structure de bande du puits quantique contraint est etudiee par spectroscopie optique. Elle est etudiee en fonction de l'epaisseur du puits

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Li, Yutao. "Electronic and plasmonic band structure engineering of graphene using superlattices." Thesis, 2021. https://doi.org/10.7916/d8-rme8-9e85.

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Patterning graphene with a spatially periodic potential provides a powerful means to modify its electronic properties. In particular, in twisted bilayers, coupling to the resulting moiré superlattice yields an isolated flat band that hosts correlated many-body phases. However, both the symmetry and strength of the effective moiré potential are constrained by the constituent crystals, limiting its tunability. Here, we have exploited the technique of dielectric patterning⁶ to subject graphene to a one-dimensional electrostatic superlattice (SL). We observed the emergence of multiple Dirac cones

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趙堅銘. "The study of the structure and magnetic properties of single crystal Co thin films and superlattices." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/62757625769690738514.

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碩士<br>輔仁大學<br>物理學研究所<br>85<br>We have studied the structure and magnetic properties of Cr/Co/Cr trilayers, Co/V superlattice and annealing effect of Co/V bilayers with different Co,Cr,V layer thickness by molecular beam epitaxy (MBE) method. We have measured their crystal structure, surface morphology and magneti properties by RHEED and XRD, AFM, MOKE, Hall-effect, room temperature MR and low temperature MR and hysteresis loops by SQUID. For Cr/Co/Cr trilayers, we have found that the transverse MR, (I//Co[0001], H-Co[0001]) is 11% at low temperature and 1% at room temperature for Co10000A

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Books on the topic "Crystal structures; Superlattices"

1

C, McGill T. Device Physics of Superlattices and Small Structures. Defense Technical Information Center, 1987.

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2

Klaus, Ploog, Linh N. T, European Materials Research Society, and Council of Europe, eds. Semiconductor quantum well structures and superlattices: May 13th-15th 1985, Strasbourg (France). Editions de physique, 1986.

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3

T, Linh N., Ploog Klaus, and Materials Research Society Meeting, eds. Seminconductor quantum well structures and superlattices VI, May 13th-15th, 1985, Strasbourg, France. Editions de physique, 1985.

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Book chapters on the topic "Crystal structures; Superlattices"

1

Mil’vidskii, M. G., V. I. Vdovin, L. K. Orlov, O. A. Kuznetsov, and V. M. Vorotyntsev. "Heterostructures and Strained Superlattices in the Ge-Si System: Growth, Structure Defects, and Electronic Properties." In Growth of Crystals. Springer US, 1996. http://dx.doi.org/10.1007/978-1-4613-1141-6_2.

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2

Sakaue, Kiyoshi, Manabu Niboshi, Teruaki Nagahara, Naokatsu Sano, Hikaru Terauchi, and Akira Yoshihara. "STRUCTURE AND ELASTICITY IN SINGLE CRYSTAL COPPER/NICKEL SUPERLATTICES." In Superconductors, Surfaces and Superlattices. Elsevier, 1994. http://dx.doi.org/10.1016/b978-1-4832-8382-1.50019-7.

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3

Hirano, Tatsumi, and Katsuhisa Usami. "Micro crystal structure analysis of Tl-1223 superconducting wire using x-ray microdiffractometer." In Superconductors, Surfaces and Superlattices. Elsevier, 1994. http://dx.doi.org/10.1016/b978-1-4832-8382-1.50102-6.

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Conference papers on the topic "Crystal structures; Superlattices"

1

Landry, E. S., A. J. H. McGaughey, and M. I. Hussein. "Dielectric Nanocomposite Layering Configurations for Thermal Conductivity Reduction." In ASME 2008 2nd Multifunctional Nanocomposites and Nanomaterials International Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/mn2008-47052.

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Thermal transport in crystals is governed by dynamic phenomena that take place at the atomic scale, namely phonon dispersion and scattering. A growing understanding of these mechanisms, coupled with increasingly capable nanofabrication and characterization technologies, provide a not-too-distant opportunity for designing a new class of materials with tailored thermal characteristics such as thermal conductivity, among other physical characteristics. Focusing on layered nanocomposites, also known as superlattices, modeled using the Lennard-Jones potential as a starting platform, we examine the

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2

Wang, Yaguo, and Xianfan Xu. "Investigation of Phonon Scattering and Thermal Conductivity Reduction in Thermoelectric Materials Using Ultrafast Time-Resolved Optical Measurements." In ASME 2009 Heat Transfer Summer Conference collocated with the InterPACK09 and 3rd Energy Sustainability Conferences. ASMEDC, 2009. http://dx.doi.org/10.1115/ht2009-88210.

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Upon filling, caged compounds like skutterudites can have their lattice thermal conductivity reduced by 4∼5 times compared with unfilled structures [1]. Recently, it was found that the thermal conductivity in Bi2Te3/Sb2Te3 superlattice structure is also greatly reduced, even comparing with its corresponding alloy, in the cross-plane direction [2]. A fundamental understanding of thermal conductivity reduction in these structures is important due to their enhanced thermoelectric figure of merit. For filled skutterudites, “phonon-glass-electron-crystal (PGEC)” scheme was adopted to describe the r

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Wojcik, Marek. "XRD investigation of the nonideal structure of the GaAs(P)/GaAs superlattice." In Liquid and Solid State Crystals: Physics, Technology, and Applications, edited by Jozef Zmija. SPIE, 1993. http://dx.doi.org/10.1117/12.156923.

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Sheregii, Eugen M. "Magnetophonon resonance as a method of studying the vertical and parallel transport in superlattices and MQW structures." In International Conference on Solid State Crystals '98, edited by Antoni Rogalski and Jaroslaw Rutkowski. SPIE, 1999. http://dx.doi.org/10.1117/12.344721.

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Gaca, Jaroslaw. "X-ray investigations of the heterogeneous terraced structure in GaAs(P)/GaAs superlattice." In Liquid and Solid State Crystals: Physics, Technology, and Applications, edited by Jozef Zmija. SPIE, 1993. http://dx.doi.org/10.1117/12.156925.

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Yu, M. B., L. Ding, Fang-Fang Ren, G. Q. Lo, and D. L. Kwong. "Light emission of 2D photonic crystal based on nanocrystal-Si/SiO 2 superlattice structure." In SPIE Photonics Europe, edited by Giancarlo C. Righini. SPIE, 2010. http://dx.doi.org/10.1117/12.854159.

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Konchady, Manohar S., Sergey Yarmolenko, Devdas M. Pai, and Jag Sankar. "Structural and Mechanical Properties of Multilayer TiN/CrN Coatings." In ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-43114.

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Multilayer and superlattice coatings of TiN/CrN coating are deposited on Si(100) substrate at different modulation wavelength by reactive unbalanced magnetron sputtering and characterized using X-ray diffraction, nanoindentation, AFM. Nano-roughness of films is in good correlation with hardness and modulus and this effect has been used for optimization of deposition parameters. Preliminary results have shown slightly better mechanical properties for multilayered TiN/CrN coatings compared to single layer TiN and CrN coatings. The XRD results have shown a preferred orientation in &lt;100&amp

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Yates, Luke, Thomas L. Bougher, Thomas Beechem, Baratunde A. Cola, and Samuel Graham. "The Impact of Interfacial Layers on the Thermal Boundary Resistance and Residual Stress in GaN on Si Epitaxial Layers." In ASME 2015 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems collocated with the ASME 2015 13th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/ipack2015-48259.

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The development of gallium nitride (GaN) on silicon (Si) substrates is a critical technology for potential low cost power electronics. These devices can accommodate faster switching speeds, hotter temperatures, and high voltages needed for power electronics applications. However, the lattice mismatch and difference in crystal structure between 111 Si and c-axis hexagonal GaN requires the use of buffer layers in order to grow device quality epitaxial layers. For lateral high electron mobility transistors, these interfacial layers act as a potential source of increased thermal boundary resistanc

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Ren, Z. F. "Nano Materials and Physics." In ASME 4th Integrated Nanosystems Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/nano2005-87045.

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Aligning carbon nanotubes in any way desired is very important for many fundamental and applied research projects. In this talk, I will first discuss how to grow them with controlled diameter, length, spacing, and periodicity using catalyst prepared by magnetron sputtering, electron beam (e-beam) lithography, electrochemical deposition, and nanosphere self-assembly. Then I will present our results of field emission property of both the aligned carbon nanotubes grown on flat substrates and random carbon nanotubes grown on carbon cloth. For the aligned carbon nanotubes arrays, I will present the

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