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Journal articles on the topic 'Crystal structures; Superlattices'

Author: Grafiati

Published: 4 June 2021

Last updated: 9 February 2022

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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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2

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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4

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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6

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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9

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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10

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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11

Sun, Lin, Haixin Lin, Kevin L. Kohlstedt, George C. Schatz, and Chad A. Mirkin. "Design principles for photonic crystals based on plasmonic nanoparticle superlattices." Proceedings of the National Academy of Sciences 115, no. 28 (2018): 7242–47. http://dx.doi.org/10.1073/pnas.1800106115.

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Photonic crystals have been widely studied due to their broad technological applications in lasers, sensors, optical telecommunications, and display devices. Typically, photonic crystals are periodic structures of touching dielectric materials with alternating high and low refractive indices, and to date, the variables of interest have focused primarily on crystal symmetry and the refractive indices of the constituent materials, primarily polymers and semiconductors. In contrast, finite difference time domain (FDTD) simulations suggest that plasmonic nanoparticle superlattices with spacer grou

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12

Dumesnil, K., C. Dufour, Ph Mangin, M. Hennion, and P. J. Brown. "Crystal and magnetic structures of Sm epitaxial thin films and Sm/Y superlattices." Physical Review B 60, no. 15 (1999): 10743–46. http://dx.doi.org/10.1103/physrevb.60.10743.

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13

Orlov, Lev K., Vladimir I. Vdovin, Natalia L. Ivina, Eduard A. Steinman, Yurii N. Drozdov, and Michail L. Orlov. "Low Temperature Growth of the Nanotextured Island and Solid 3C-SiC Layers on Si from Hydric Si, Ge and C Compounds." Crystals 10, no. 6 (2020): 491. http://dx.doi.org/10.3390/cryst10060491.

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Different growth stages and surface morphology of the epitaxial 3C-SiC/Si(100) structures were studied. Heterocompositions were grown in vacuum from hydric compounds at a lower temperature. The composition, surface morphology and crystal structure of the 3C-SiC films were tested using X-ray diffraction, second ion mass spectrometry, scanning ion and electron microscopy, photo- and cathode luminescence. It was demonstrated that the fine crystal structure of the 3C-SiC islands was formed by the close-packed nanometer-size grains and precipitated on the underlying solid carbonized Si layer. Lumin

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14

Simsek, Sevket, Selami Palaz, Husnu Koc, Amirullah M. Mamedov, and Ekmel Ozbay. "Complete photonic band gaps in Sn2P2X6 (X = S, Se) supercell photonic crystals." Ferroelectrics 557, no. 1 (2020): 92–97. http://dx.doi.org/10.1080/00150193.2020.1713353.

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In this work, we present an investigation of the optical properties and band structures for the photonic crystal structures (PCs) based on Sn2P2X6: X = S, Se) with Fibonacci superlattices. The optical properties of PCs can be tuned by varying structure parameters such as the lengths of poled domains, filling factor, and dispersion relation. In our simulation, we employed the finite-difference time domain technique and the plane wave expansion method, which implies the solution of Maxwell equations with centered finite-difference expressions for the space and time derivatives.

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15

Simsek, S., S. Palaz, A. M. Mamedov, and E. Ozbay. "Fibonacci Sequences Quasiperiodic A5B6C7 Ferroelectric Based Photonic Crystal: FDTD analysis." Advanced Electromagnetics 6, no. 4 (2017): 6–10. http://dx.doi.org/10.7716/aem.v6i4.451.

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In this study, we present an investigation of the optical properties and band structures for the conventional and Fibonacci photonic crystals (PCs) based on some A5B6C7 ferroelectrics (SbSBr and BiTeCl). Here, we use one dimensional SbSBr and BiTeCl based layers in air background. We have theoretically calculated the photonic band structure and transmission spectra of SbSBr and BiTeCl based PC superlattices. The position of minima in the transmission spectrum correlates with the gaps obtained in the calculation. The intensity of the transmission depths is more intense in the case of higher ref

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16

Noguchi, Yuji, and Hiroki Matsuo. "Polarization and Dielectric Properties of BiFeO3-BaTiO3 Superlattice-Structured Ferroelectric Films." Nanomaterials 11, no. 7 (2021): 1857. http://dx.doi.org/10.3390/nano11071857.

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Superlattice-structured epitaxial thin films composed of Mn(5%)-doped BiFeO3 and BaTiO3 with a total thickness of 600 perovskite (ABO3) unit cells were grown on single-crystal SrTiO3 substrates by pulsed laser deposition, and their polarization and dielectric properties were investigated. When the layers of Mn-BiFeO3 and BaTiO3 have over 25 ABO3 unit cells (N), the superlattice can be regarded as a simple series connection of their individual capacitors. The superlattices with an N of 5 or less behave as a unified ferroelectric, where the BaTiO3 and Mn-BiFeO3 layers are structurally and electr

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17

Friedrich, H., CJ Gommes, K. Overgaag, et al. "Binary Nanoparticle Superlattices in 3D: from Quantitative Analysis of Crystal Structures to Characterization of Lattice Defects." Microscopy and Microanalysis 15, S2 (2009): 1192–93. http://dx.doi.org/10.1017/s1431927609096123.

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18

Engel, Brad N., and Charles M. Falco. "Magnetic and Magneto-Optical Properties of Interfaces and Superlattices." MRS Bulletin 15, no. 9 (1990): 34–37. http://dx.doi.org/10.1557/s0883769400062424.

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The ability to study, and to some extent control, the magnetic properties of surfaces and interfaces is an extremely interesting development in the field of magnetism. Along with experimental advances in techniques to accurately prepare magnetic structures by such methods as sputtering and molecular beam epitaxy (MBE) have been theoretical and computational advances in the ability to calculate properties of realistic model systems. At the same time, increasingly sophisticated characterization techniques have become available (e.g., intense synchrotron sources, pulsed sources for magnetic neutr

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19

Franzosi, P., and B. Jenichen. "Interference effects in x‐ray double‐crystal rocking curves of Ga1−xAlxAs/GaAs laser structures and superlattices." Journal of Applied Physics 70, no. 1 (1991): 499–501. http://dx.doi.org/10.1063/1.350258.

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20

Claridge, John. "Crystal Chemistry and Symmetry based approaches to multiferroics." Acta Crystallographica Section A Foundations and Advances 70, a1 (2014): C977. http://dx.doi.org/10.1107/s2053273314090226.

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The area of improper ferroelectrics and potentially multiferroics has recently received significant attention do the prediction that a combination of a–a–c+ tilting and layered ordering of the A site cations along [001]perov in perovskite ABX3 systems or in the even n Ruddlesden Popper (RP) phases (An+1BnX3n+1), leads to non-centrosymmetric structures which are predicted to have significant switchable polarisations. Two practical examples will be discussed: (i) Suitable doping of the RP phase SrLn2Fe2O7 can induce a polar tilted ground state where weak ferromagnetism and magnetocelecricity are

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21

Wasa, Kiyotaka, Hideaki Adachi, Kumiko Hirochi, Yo Ichikawa, Tomoaki Matsushima, and Kentaro Setsune. "Thin film processing for high-Tc superconductors of the Bi-system." Journal of Materials Research 6, no. 7 (1991): 1595–604. http://dx.doi.org/10.1557/jmr.1991.1595.

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Basic thin film deposition processes for controlled deposition of the high-Tc superconductors of the Bi-systems are described. The layered structures of Bi-oxide superconductors are fabricated by a multitarget sputtering process. The multitarget sputtering process realizes the controlled deposition of single phase Bi-oxide superconductors, Bi2O2 · 2SrO · (n −1)CaO · nCuO2 for n = 1 to 5. The minimum thickness controlled by the multitarget sputtering is a half crystal unit-cell of around 15 Å, and the superlattices comprising (AkBk) · m, where A and B denote the Bi-oxide superconductors with di

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22

Weiss, François, Marc Audier, Ausrine Bartasyte, et al. "Multifunctional oxide nanostructures by metal-organic chemical vapor deposition (MOCVD)." Pure and Applied Chemistry 81, no. 8 (2009): 1523–34. http://dx.doi.org/10.1351/pac-con-08-08-10.

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The development of thin films, in the context of ongoing reduction in the size of electronic systems, poses challenging questions for the materials sciences of multifunctional nanostructures. These include the limits of size reduction, integration of heterogeneous functions, and system characterization or process control at an atomic scale. We present here different studies devoted to perovskite oxide materials (or materials with derived structure), where in specific directions of the crystal structure the atomic organization decreases down to a few nanometers, thus building nanostructures. In

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23

SUMMERS, CHRISTOPHER J., CURTIS W. NEFF, and WOUNJHANG PARK. "ACTIVE PHOTONIC CRYSTAL NANO-ARCHITECTURES." Journal of Nonlinear Optical Physics & Materials 12, no. 04 (2003): 587–97. http://dx.doi.org/10.1142/s0218863503001663.

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The development of nano-scaled photonic crystal structures has resulted in many new devices exhibiting non-classical optical behavior. Typically, in these structures a photonic band gap and associated defect mode are used to create waveguides, resonators, couplers and filters. In this paper we propose that the functionality of these structures can be significantly enhanced by the infiltration of the photonic crystal with other classes of materials, particularly highly nonlinear liquid crystals and electro-optical materials. The properties of conventional 2D PC slab waveguides were simulated by

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24

LI, L., J. C. ZHONG, M. LI, X. H. WANG, and G. J. LIU. "ANALYSIS OF GaAs/AlAs SUPERLATTICE STRUCTURE BY X-RAY DOUBLE-CRYSTAL DIFFRACTION." International Journal of Modern Physics B 19, no. 15n17 (2005): 2375–79. http://dx.doi.org/10.1142/s0217979205031006.

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The high quality GaAs/AlAs superlattice structures are characterized by X-ray double-crystal diffraction. The structure parameters of the superlattice are obtained from the rocking curve. The first and second satellite peaks appear around the main 0th-order peak. The FWHMs of 0th-order peak and GaAs substrate are quite close, showing much higher integrity of the crystal lattice. The superlattice structure period D, GaAs thick-ness LB and AlAs thickness LZ can be calculated according to the measured angular distance between the diffraction peaks. The experimental results show that the measured

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25

Nespolo, Massimo. "Lattice versus structure, dimensionality versus periodicity: a crystallographic Babel?" Journal of Applied Crystallography 52, no. 2 (2019): 451–56. http://dx.doi.org/10.1107/s1600576719000463.

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In this article, several mistakes occurring in the description of crystal structures are pointed out. (1) The term `lattice' is often used instead of `structure'. (2) The two terms `superlattice' and `sublattice' are incorrectly interchanged. (3) Substructures composed of a subset of the crystallographic orbits composing the structure are incorrectly called `sublattices'. (4) Subperiodic structures are incorrectly referred to as `low-dimensional' structures.

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26

Iijima, Sumio. "Superconductivities and structure modulations in Tl-Ba-Ca-Cu-O oxides." Proceedings, annual meeting, Electron Microscopy Society of America 47 (August 6, 1989): 170–71. http://dx.doi.org/10.1017/s0424820100152823.

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Charge carrier sources for the superconductivities of high Tc oxides have been sought by various techniques. The role of lattice defects in the superconductivity, and structural defects which are common in these oxides, were investigated by electron microscopists. In this paper, microstructures on TBCCO oxide crystals, in particular, superlattice modulations in the 2201 phase, and Y-doped 2212 phases which are prepared under various growth conditions, are presented. All specimens were prepared in the standard sintering method.In contrast with the 2212 and 2223 compounds, the 2201 compounds sho

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27

Sankin, Vladimir Ilich, Alexander V. Andrianov, A. G. Petrov, et al. "The Bloch Oscillations and THz Electroluminescence in Natural Superlattices of 6H-, 8H-SiC Polytypes." Materials Science Forum 821-823 (June 2015): 277–80. http://dx.doi.org/10.4028/www.scientific.net/msf.821-823.277.

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We report on the observation of the THz electroluminescence in 6H-SiC and 8H-SiC n+–n-–n+structures of hexagonal crystals with natural superlattice, caused by applied electrical field along the lattice and natural superlattice axis. It is shown that there are the terahertz electroluminescence correspond to the narrow lines at 5.3–12.7 meV. The emission channel can be well explained by the optical intraladder transitions in the Bloch oscillations regime.

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Li, D. X., B. M. Davis, D. N. Seidman, and J. B. Ketterson. "High Resolution Electron Microscopy Study of Cu-Pd Superlattice." Proceedings, annual meeting, Electron Microscopy Society of America 48, no. 1 (1990): 78–79. http://dx.doi.org/10.1017/s0424820100179142.

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Considerable interest has been generated in metallic superlattice structures by the discovery of anomalous variations in their physical properties as a function of layer thickness. We have prepared Cu-Pd superlattice samples consisting of 400 alternating layers of Cu and Pd, and with modulation wavelengths in the range 1.4-4.0 nm by dual electron beam evaporation. in a UHV system. Prior to depositing a superlattice film, a Cu buffer layer with a thickness of 130 nm was deposited onto a cleaved mica substrate. In order to study the growth morphology, crystal structure and atomic ordering near t

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29

JOHNSON, P. B., P. W. GILBERD, YVONNE MORRISON, and C. R. VAROY. "GAS-BUBBLE ORDERING IN NANOPOROUS SURFACE FORMATION IN HELIUM-IMPLANTED METALS." Modern Physics Letters B 15, no. 28n29 (2001): 1391–401. http://dx.doi.org/10.1142/s0217984901003317.

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The nanoporous surfaces that can be produced by ion implantation of helium into metals have considerable potential for applications. The structures are characterised by random nanoscale cavities of uniform size, a high degree of swelling and very thin metal "walls" separating the neighbouring cavities. These structures are "seeded" by an earlier stage - a gas-bubble superlattice - comprising small helium bubbles again of uniform size (~ 2 nm diameter) ordered on a space lattice having the same symmetry as the host. For the fcc metals the bubble superlattice always contains structural variants

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30

NEMATI, MAJID. "THE DISORDERING EFFECT ON THE ONE-DIMENSIONAL APPERIODIC OPTICAL SUPER-LATTICE IN MULTI-FREQUENCY SHG." International Journal of Modern Physics: Conference Series 15 (January 2012): 191–96. http://dx.doi.org/10.1142/s2010194512007143.

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A multi-frequency second harmonic generation (SHG) in one dimensional nonlinear aperiodic optical superlattice in the presence of linear spacers is considered. The effect of random fluctuations in the length of each layer on the output efficiency of SHG process is investigated, and the favorable percentage of fluctuation in the fabrication of aperiodic optical superlattice is obtained. Comparing perfect and fluctuated aperiodic structures, the researcher realized the decrease in the amount of output efficiency with the increase of fluctuation in the linear-nonlinear aperiodic crystals.

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Ikezaki, M., Y. Noguchi, and M. Miyayama. "Electrical Properties of Superlattice-Structured Bi4Ti3O12?PbBi4Ti4O15Single Crystals." Journal of the American Ceramic Society 90, no. 9 (2007): 2814–18. http://dx.doi.org/10.1111/j.1551-2916.2007.01844.x.

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Zaytseva, Yu S., N. I. Borgardt, A. S. Prikhodko, E. Zallo, and R. Calarco. "Electron Microscopy Studies of the Structure of Thin Epitaxial Ge2Sb2Te5 Layers Grown on Si(111) Substrate." Proceedings of Universities. Electronics 26, no. 3-4 (2021): 214–25. http://dx.doi.org/10.24151/1561-5405-2021-26-3-4-214-225.

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To create memory cells of new generation, epitaxial layers of Ge2Sb2Te5 (GST) material, with high crystalline perfection, and multilayered crystalline structures based on GeTe/Sb2Te3 superlattices grown on Si-wafers are of interest. This initiates the study of these and alike materials generation patterns, including with the involvement of molecular beam epitaxy. In this work, the structure of 13 nm thick layers of GST material, used to create phase-change memory cells was studied. These layers were grown on an Sb-passivated Si(111) substrate by molecular beam epitaxy. Research studies were ca

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33

Wang, Hong, Desheng Zhang, Xiaoli Wang, and Xi Yao. "Effect of La2O3 substitutions on structure and dielectric properties of Bi2O3–ZnO–Nb2O5-based pyrochlore ceramics." Journal of Materials Research 14, no. 2 (1999): 546–48. http://dx.doi.org/10.1557/jmr.1999.0078.

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The effect of La2O3 substitutions on structure and dielectric properties of Bi2O3 –ZnO–Nb2O5-based ceramics was investigated. Bi1.5-xLaxZn0.5(Zn0.5Nb1.5)O7 samples were prepared by conventional ceramic processing technology. The crystal structure of the Bi1.5Zn0.5(Zn0.5Nb1.5)O7 sample was characterized as a pure cubic pyrochlore. With a lower amount of La2O3 substitution, the crystal structures were still cubic pyrochlore. Superlattice x-ray diffraction line was identified for some compositions. With the increasing amount of La2O3 substitution, the crystal structure gradually transformed from

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34

Bevk, J., J. P. Mannaerts, L. C. Feldman, B. A. Davidson, and A. Ourmazd. "Ge‐Si layered structures: Artificial crystals and complex cell ordered superlattices." Applied Physics Letters 49, no. 5 (1986): 286–88. http://dx.doi.org/10.1063/1.97143.

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Ge, Yan Ling, Ilkka Aaltio, Outi Söderberg, and Simo Pekka Hannula. "X-Ray Diffraction Reciprocal Space Mapping Study of Modulated Crystal Structures in 10M Ni-Mn-Ga Martensitic Phase." Materials Science Forum 635 (December 2009): 63–68. http://dx.doi.org/10.4028/www.scientific.net/msf.635.63.

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The 10M modulated crystal structure in Ni-Mn-Ga martensitic phase with about 0.5 MPa twinning stress, was studied by X-ray diffraction reciprocal space mapping (RSM). The experimental procedure is established for collecting large range of RSM with scattering planes inclined to the surface of specimen. The investigation focused on the superlattice reflections caused by the modulation, which always appeared in two <110> directions in bulk material. The distribution of two modulation domains varies with scattering locations.

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Malar Kodi, A., V. Doni Pon, and K. S. Joseph Wilson. "Analysis of photonic band gap in novel piezoelectric photonic crystal." Modern Physics Letters B 32, no. 08 (2018): 1850024. http://dx.doi.org/10.1142/s0217984918500240.

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The transmission properties of one-dimensional novel photonic crystal having silver-doped novel piezoelectric superlattice and air as the two constituent layers have been investigated by means of transfer matrix method. By changing the appropriate thickness of the layers and filling factor of nanocomposite system, the variation in the photonic band gap can be studied. It is found that the photonic band gap increases with the filling factor of the metal nanocomposite and with the thickness of the layer. These structures possess unique characteristics enabling one to operate as optical waveguide

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Shrivastava, M. C., and S. Swaminathan. "Characterisation of InGaAs/GaAs superlattice structures by X-ray double crystal diffraction." Microelectronics Journal 19, no. 5 (1988): 29–33. http://dx.doi.org/10.1016/s0026-2692(88)80136-8.

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Kobayashi, Tomo, Yuji Noguchi, and Masaru Miyayama. "Enhanced spontaneous polarization in superlattice-structured Bi4Ti3O12–BaBi4Ti4O15 single crystals." Applied Physics Letters 86, no. 1 (2005): 012907. http://dx.doi.org/10.1063/1.1847693.

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Effend, y., LM Engelhardt, PC Healy, BW Skelton, and AH White. "Lewis-Base Adducts of Group 11 Metal(I) Compounds. Synthesis and Structural Characterization of Some Halopyridin/triphenylphosphinesilver(I) Complexes: Some Space Group Revisions for Parts LII-LIV." Australian Journal of Chemistry 44, no. 11 (1991): 1585. http://dx.doi.org/10.1071/ch9911585.

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Redetermination of the room-temperature crystal structures of mononuclear chloro- and bromo-pyridinebis ( triphenylphosphine )silver(I) (previously described in space group P21/m) and di-μ-iodo-bis [(pyridine)( triphenylphosphine )silver(I)](previously described in space group C2/m), consequent upon the availability of crystals of improved quality, has permitted the reassignment of space groups as P21/a (with doubled a axis) and C2/c respectively, by virtue of the facilitated detection of weak superlattice reflections. Crystals of [ Cl,BrAg ( py )(PPh3)2] are monoclinic, P21/a, a ≈ 19.6, b ≈ 2

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Ikezaki, Mariko, Yuji Noguchi, Keiichi Katayama, and Masaru Miyayama. "Crystal Growth and Ferroelectric Properties of Superlattice-Structured Bi₄Ti₃O₁₂-PbBi₄Ti₄O₁₅ Single Crystals." Key Engineering Materials 388 (September 2008): 237–40. http://dx.doi.org/10.4028/www.scientific.net/kem.388.237.

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Superlattice-structured Bi4Ti3O12- PbBi4Ti4O15 single crystals were grown, and their properties of polarization hysteresis and leakage current along the a axis were investigated. Oxidation annealing led to a marked increase in leakage current, while annealing in N2 atmosphere yielded a marked decrease in leakage current at room temperature. These results show that electron hole is the dominant carrier for the leakage current. A well-saturated polarization hysteresis with a remanent polarization of 41 μC/cm2 was observed, which is suggested to originate from the peculiar ferroelectric displacem

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SUMMERS, C. J., E. GRAUGNARD, D. P. GAILLOT, T. YAMASHITA, C. W. NEFF, and J. BLAIR. "TUNING OF PHOTONIC CRYSTAL BAND PROPERTIES BY ATOMIC LAYER DEPOSITION." Journal of Nonlinear Optical Physics & Materials 17, no. 01 (2008): 1–14. http://dx.doi.org/10.1142/s021886350800397x.

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We report the application of atomic layer deposition to manipulate the dielectric architecture of conventional and superlattice two-dimensional photonic crystal waveguides fabricated in silicon. Conformal deposition of a second dielectric layer is shown to have a dramatic influence on the photonic band structure and produces unique effects that cannot be emulated in a single dielectric slab photonic crystal material. With additional dielectric coatings, a strong decrease in photonic band frequencies and change in band slope are observed, which for the lowest photonic states produces strong deg

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Wu, Gwo-Mei, Chen-Wen Tsai, Nie-Chuan Chen, and Pen-Hsiu Chang. "Investigation of GaN crystal quality on silicon substrates using GaN/AlN superlattice structures." Crystal Research and Technology 42, no. 12 (2007): 1276–80. http://dx.doi.org/10.1002/crat.200711018.

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Garcia-Moliner, F., and V. R. Velasco. "Theory of Layered Structures Formed With Discrete Crystals: Quantum Wells Sandwiches and Superlattices." Physica Scripta 34, no. 3 (1986): 252–56. http://dx.doi.org/10.1088/0031-8949/34/3/014.

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Elsaesser, Thomas, and Michael Woerner. "Photoinduced structural dynamics of polar solids studied by femtosecond X-ray diffraction." Acta Crystallographica Section A Foundations of Crystallography 66, no. 2 (2010): 168–78. http://dx.doi.org/10.1107/s0108767309048181.

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Femtosecond X-ray diffraction allows for real-time mapping of structural changes in condensed matter on atomic length and timescales. Sequences of diffraction patterns provide both transient geometries and charge-density maps of crystalline materials. This article reviews recent progress in this field, the main emphasis being on experimental work done with laser-driven hard X-ray sources. Both Bragg diffraction techniques for bulk and nanostructured single crystals as well as the recently implemented powder diffraction from polycrystalline samples are discussed. In ferroelectric superlattice s

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Ogawa, Shigesaburo, та Isao Takahashi. "Unveiling the Uniqueness of Crystal Structure and Crystalline Phase Behavior of Anhydrous Octyl β-D-Glucoside Using Aligned Assembly on a Surface". Polymers 12, № 3 (2020): 671. http://dx.doi.org/10.3390/polym12030671.

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Although the anomalous low crystallinity of octyl β-D-glucoside (β-OGlu) was first proposed more than 30 years ago, many fundamental aspects of its crystal structure and of the crystalline phase behavior of the pure substance have remained uncertain. In this paper, we employ grazing-incidence wide-angle X-ray-diffraction measurements using a two-dimensional detector (2D-GI-WAXD) and perpendicularly aligned crystalline films to demonstrate that β-OGlu forms crystal structures consisting of an intermediate phase—like a ripple phase with two large crystal-lattice constants, a and c, comparable to

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Björk, Helen, Sven Lidin, Torbjörn Gustafsson, and John O. Thomas. "Superlattice formation in the lithiated vanadium oxide phases Li0.67V6O13 and LiV6O13." Acta Crystallographica Section B Structural Science 57, no. 6 (2001): 759–65. http://dx.doi.org/10.1107/s0108768101014264.

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Two new lithiated phases of V6O13 were formed by carefully tuning the temperature of electrochemical lithiation in a `coffee-bag' type Li-ion battery at 2.78 V versus Li/Li+. These were studied by single-crystal X-ray diffraction. A phase with the composition Li2/3V6O13 was obtained at 308 K with a unit cell three times the volume of the original V6O13 cell. A single crystal discharged at ambient temperature was shown to be LiV6O13 and twice the unit-cell volume of the original V6O13 cell. On lithiation, the structures retain their basic V6O13 structure of alternating single and double layers

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Cepeda-Perez, E., D. Doblas, T. Kraus, and N. de Jonge. "Electron microscopy of nanoparticle superlattice formation at a solid-liquid interface in nonpolar liquids." Science Advances 6, no. 20 (2020): eaba1404. http://dx.doi.org/10.1126/sciadv.aba1404.

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Nanoparticle superlattice films form at the solid-liquid interface and are important for mesoscale materials, but are notoriously difficult to analyze before they are fully dried. Here, the early stages of nanoparticle assembly were studied at solid-liquid interfaces using liquid-phase electron microscopy. Oleylamine-stabilized gold nanoparticles spontaneously formed thin layers on a silicon nitride (SiN) membrane window of the liquid enclosure. Dense packings of hexagonal symmetry were obtained for the first monolayer independent of the nonpolar solvent type. The second layer, however, exhibi

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Takahashi, Miwako, Ken-ichi Ohshima, and Masatoshi Arai. "A single-crystal time-of-flight neutron diffractometer at a spallation neutron source." Journal of Applied Crystallography 40, no. 4 (2007): 799–807. http://dx.doi.org/10.1107/s0021889807023059.

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A single-crystal diffractometer using the time-of-flight (TOF) Laue technique had been operated for studies of structural and magnetic disorder and phase transitions in alloys and magnetic materials at the pulsed spallation neutron source facility of the KEK Neutron Science Laboratory (KENS). In various sample environments, the diffractometer has demonstrated its usefulness in measurements of diffuse scattering for studying local structures, and in surveys of reciprocal space for studying phase transitions and incommensurate structures under the conditions of varying temperature and magnetic f

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Blackstead, Howard A., John D. Dow, and Martin Lehmann. "Superconductivity in R2-zCezCuO4-Type Compounds." International Journal of Modern Physics B 12, no. 29n31 (1998): 2965–70. http://dx.doi.org/10.1142/s0217979298001873.

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The superconductivity of R 2-z Ce z CuO 4 (R214) is discussed and compared with the superconductivity of the 1 × 1 natural superlattice made of it and various oxide layers, R 2-z Ce z Sr 2 Cu 2 MO 10 (R222M10), where R is a tri-valent rare-earth ion and M=Nb, Ta, Ru, or Ti. Using simple models, we are able to understand the dependences on rare-earth size of superconductivity, of the ability to fabricate R214, of the onset of weak ferromagnetism and of the onset of crystal distortions. We can also understand the dependence of R214 superconductivity on angular momentum quantum number L and the s

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PAINE, BRUCE M. "X-RAY DIFFRACTION ANALYSIS OF EPITAXIAL STRUCTURES." MRS Proceedings 56 (1985). http://dx.doi.org/10.1557/proc-56-121.

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AbstractThe technique is described for use of x-ray double crystal diffractometry for analysis of epitaxial structures. This method has been shown to be very useful for characterizing a wide variety of configurations, ranging from single epitaxial layers to damaged superlattices. It yields depth profiles of structure factors and strains relative to the substrate, which can be directly related to layer thicknesses and compositions. Information about dislocations and random atomic displacements is also present. The key to this technique is computer fitting of the x-ray data with a model for the

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