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Relevant bibliographies by topics / Crystal field

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Academic literature on the topic 'Crystal field'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 May 2024

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Journal articles on the topic "Crystal field"

1

Ross, Nancy L., and John R. Sowerby. "High-pressure crystal-field spectra of single-crystal clinoferrosilite." European Journal of Mineralogy 11, no. 5 (September 30, 1999): 791–802. http://dx.doi.org/10.1127/ejm/11/5/0791.

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Rossano, Stéphanie, Laurence Galoisy, and Gabriel Gwamnesia. "Crystal-field spectrum of γ-Ni2SiO4." European Journal of Mineralogy 8, no. 3 (June 17, 1996): 471–76. http://dx.doi.org/10.1127/ejm/8/3/0471.

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Ryu, Sun Young, In Hwan Oh, Sang Jin Cho, Shin Ae Kim, and Hyun Kyu Song. "Enhancing Protein Crystallization under a Magnetic Field." Crystals 10, no. 9 (September 16, 2020): 821. http://dx.doi.org/10.3390/cryst10090821.

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High-quality crystals are essential to ensure high-resolution structural information. Protein crystals are controlled by many factors, such as pH, temperature, and the ion concentration of crystalline solutions. We previously reported the development of a device dedicated to protein crystallization. In the current study, we have further modified and improved our device. Exposure to external magnetic field leads to alignment of the crystal toward a preferred direction depending on the magnetization energy. Each material has different magnetic susceptibilities depending on the individual direction of their unit crystal cells. One of the strategies to acquire a large crystal entails controlling the nucleation rate. Furthermore, exposure of a crystal to a magnetic field may lead to new morphologies by affecting the crystal volume, shape, and quality.

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Choudhury, P. K. "Evanescent Field Enhancement in Liquid Crystal Optical Fibers: A Field Characteristics Based Analysis." Advances in Condensed Matter Physics 2013 (2013): 1–9. http://dx.doi.org/10.1155/2013/504868.

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The paper presents the analysis of the electromagnetic wave propagation through liquid crystal optical fibers (LCOFs) of two different types—conventional guides loaded with liquid crystals (addressed as LCOFs) and those with additional twists due to conducting helical windings (addressed as HCLCOFs). More precisely, the three-layer optical waveguide structures are considered along with its outermost region being loaded with radially anisotropic liquid crystal material and the inner regions being made of usual silica, as used in conventional optical fibers. In addition to that, LCOF with twists introduced in the form of conducting helical windings at the interface of the silica core and the liquid crystal clad is also taken into account. Emphasis has been put on the power confinements by the lower-order TE modes sustained in the different sections of the LCOF structure. The results demonstrate useful applications of these guides in integrated optics as the power sustained in the liquid crystal section by the excited TE modes remains very high. In the case of twisted clad liquid crystal guides, descriptions are limited to the nature of dispersion relation only under the TE mode excitation, and corresponding to the cases of helix orientations being parallel and perpendicular to the optical axis.

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Tang, Xia, Botao Liu, Yue Yu, Sheng Liu, and Bing Gao. "Numerical Analysis of Difficulties of Growing Large-Size Bulk β-Ga2O3 Single Crystals with the Czochralski Method." Crystals 11, no. 1 (December 30, 2020): 25. http://dx.doi.org/10.3390/cryst11010025.

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The difficulties in growing large-size bulk β-Ga2O3 single crystals with the Czochralski method were numerically analyzed. The flow and temperature fields for crystals that were four and six inches in diameter were studied. When the crystal diameter is large and the crucible space becomes small, the flow field near the crystal edge becomes poorly controlled, which results in an unreasonable temperature field, which makes the interface velocity very sensitive to the phase boundary shape. The effect of seed rotation with increasing crystal diameter was also studied. With the increase in crystal diameter, the effect of seed rotation causes more uneven temperature distribution. The difficulty of growing large-size bulk β-Ga2O3 single crystals with the Czochralski method is caused by spiral growth. By using dynamic mesh technology to update the crystal growth interface, the calculation results show that the solid–liquid interface of the four-inch crystal is slightly convex and the center is slightly concave. With the increase of crystal growth time, the symmetry of cylindrical crystal will be broken, which will lead to spiral growth. The numerical results of the six-inch crystal show that the whole solid–liquid interface is concave and unstable, which is not conducive to crystal growth.

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He, Xinke, Linnong Li, Xinqi He, and Chao Xie. "Multi-Physical Field Simulation of Cracking during Crystal Growth by Bridgman Method." Materials 16, no. 8 (April 20, 2023): 3260. http://dx.doi.org/10.3390/ma16083260.

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Crystal materials are prone to cracking during growth, which is a key problem leading to slow growth and difficulty in forming large-size crystals. In this study, based on the commercial finite element software COMSOL Multiphysics, the transient finite element simulation of the multi-physical field, including fluid heat transfer—phase transition—solid equilibrium—damage coupling behaviors, is performed. The phase-transition material properties and maximum tensile strain damage variables are customized. Using the re-meshing technique, the crystal growth and damage are captured. The results show the following: The convection channel at the bottom of the Bridgman furnace greatly influences the temperature field inside the furnace, and the temperature gradient field significantly influences the solidification and cracking behaviors during crystal growth. The crystal solidifies faster when it enters the higher-temperature gradient region and is prone to cracking. The temperature field inside the furnace needs to be properly adjusted so that the crystal temperature decreases relatively uniformly and slowly during the growth process to avoid crack formation. In addition, the crystal growth orientation also significantly affects the nucleation and growth direction of cracks. Crystals grown along the a-axis tend to form long cracks starting from the bottom and growing vertically, while crystals grown along the c-axis induce the laminar cracks from the bottom in a horizontal direction. The numerical simulation framework of the damage during crystal growth, which can accurately simulate the process of crystal growth and crack evolution and can be used to optimize the temperature field and crystal growth orientation in the Bridgman furnace cavity, is a reliable method to solve the crystal cracking problem.

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Voronin, Vladimir, Valery Fedorov, Sergey Semenikhin, and Yaroslav Berdnikov. "Neutron spin rotation effect at Laue diffraction in a weakly deformed and nonabsorbing crystal with no center of symmetry." EPJ Web of Conferences 219 (2019): 06003. http://dx.doi.org/10.1051/epjconf/201921906003.

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The effect of the neutron spin rotation at Laue diffraction in a weakly deformed noncentrosymmetric and transparent for the neutrons crystal has been theoretically described and experimentally investigated. This effect arises in the deformed crystal because of the curvature of the neutron trajectory in the crystal. A certain type of deformation leads to the escape outside the crystal of one of the two neutron waves excited at Laue diffraction. This two waves propagate in the crystal without a center of symmetry in electric fields with the opposite sign. In this case the spin of the remaining neutron wave will be rotating relative to the original direction due to the interaction of the magnetic moment of the moving neutron with the crystal's intracrystalline electric field. In a perfect undeformed crystal such spin rotation effect is absent. There is only a depolarization of the beam since both waves in opposite electric fields are present with the same amplitudes. A technique for controlled deformation of a perfect single crystal by creating a temperature gradient has been developed. Thus a new possibility to measure the electric fields which act on the neutron in noncentrosymmetric crystals has been realized. There also appeared a way to control these fields in experiments on the study of the neutron fundamental properties.

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Bulutoglu, Pelin Su, Conor Parks, Nandkishor K. Nere, Shailendra Bordawekar, and Doraiswami Ramkrishna. "Exploring New Crystal Structures of Glycine via Electric Field-Induced Structural Transformations with Molecular Dynamics Simulations." Processes 7, no. 5 (May 8, 2019): 268. http://dx.doi.org/10.3390/pr7050268.

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Being able to control polymorphism of a crystal is of great importance to many industries, including the pharmaceutical industry, since the crystal’s structure determines significant physical properties of a material. While there are many conventional methods used to control the final crystal structure that comes out of a crystallization unit, these methods fail to go beyond a few known structures that are kinetically accessible. Recent studies have shown that externally applied fields have the potential to effectively control polymorphism and to extend the set of observable polymorphs that are not accessible through conventional methods. This computational study focuses on the application of high-intensity dc electric fields (e-fields) to induce solid-state transformation of glycine crystals to obtain new polymorphs that have not been observed via experiments. Through molecular dynamics simulations of solid-state α -, β -, and γ -glycine crystals, it has been shown that the new polymorphs sustain their structures within 125 ns after the electric field has been turned off. It was also demonstrated that strength and direction of the electric field and the initial structure of the crystal are parameters that affect the resulting polymorph. Our results showed that application of high-intensity dc electric fields on solid-state crystals can be an effective crystal structure control method for the exploration of new crystal structures of known materials and to extend the range of physical properties a material can have.

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Bai, Minyu, Shuai Wen, Jijie Zhao, Yuxuan Du, Fei Xie, and Huan Liu. "Effect of Carrier Gas Flow Field on Chemical Vapor Deposition of 2D MoS2 Crystal." Coatings 11, no. 5 (May 6, 2021): 547. http://dx.doi.org/10.3390/coatings11050547.

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The carrier gas flow field plays a vital role in the chemical vapor deposition (CVD) process of two dimensional (2D) MoS2 crystal, which was studied by simulations and experiments. Different carrier gas flow fields were studied by utilizing three types of precursor carrier which affected the local gas flow field significantly. The experiment results showed that the appropriate precursor vapor concentration could be achieved by local carrier gas flow field conditioning, resulting in single 2D MoS2 crystals of a large size and a high coating rate of 2D MoS2 crystal on the target substrate surface. The carrier gas flow also contributed to the growth of the 2D MoS2 crystal when it flew towards the target surface. The size of deposited single 2D MoS2 crystal reached tens of micrometers and a few layers of 2D MoS2 crystal were characterized and confirmed.

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Zhong, Z., M. Hasnah, A. Broadbent, E. Dooryhee, and M. Lucas. "Phase-space matching between bent Laue and flat Bragg crystals." Journal of Synchrotron Radiation 26, no. 6 (October 23, 2019): 1917–23. http://dx.doi.org/10.1107/s1600577519010774.

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Through phase-space analysis of Dumond diagrams for a flat Bragg crystal, a single bent Laue crystal and a monochromator consisting of double-bent Laue crystals, this work shows that it is possible to match the flat Bragg crystal to both the single-crystal and double-crystal Laue monochromators. The matched system has the advantage that the phase space of the bent crystal's output beam is much larger than that of the flat crystal, making the combined system stable. Here it is suggested that such a matched system can be used at synchrotron facilities to realize X-ray dark-field imaging, analyzer-based imaging and diffraction-enhanced imaging at beamlines using double-Laue monochromators.

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Dissertations / Theses on the topic "Crystal field"

1

吳潔貞 and Kit-ching Betty Ng. "Correlation effects in crystal field splitting." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1986. http://hub.hku.hk/bib/B31230714.

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Ng, Kit-ching Betty. "Correlation effects in crystal field splitting /." [Hong Kong : University of Hong Kong], 1986. http://sunzi.lib.hku.hk/hkuto/record.jsp?B12323342.

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Lee, Michael James. "Crystal field matrix reduction and polarisation interference calculations." Thesis, University of Canterbury. Physics and Astronomy, 1999. http://hdl.handle.net/10092/8169.

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The theory of one-electron crystal field parametrisation for optical spectra of rare-earth doped crystalline lattices dates back over forty years. The effect of the crystal host material is to split the free-ion degeneracy of the rare-earth multiplets. Some of these multiplets have structure which defies explanation in terms of crystal field theory and new developments have emerged within the last five years to address the problem. One of these methods takes the set of crystal field operators and appends two-electron correlation operators. Another adjusts the crystal field operators to include excited state configuration effects. A direct comparison of fitted parameters is meaningless, the corresponding operators being defined on different spaces. Here the techniques of matrix reduction, as developed in effective operator theory, are applied to larger configuration Hamiltonians to model their effects in correlation space. Correlation operators are then fitted to the reduced configuration matrices to establish a connection between the two approaches. Transition intensity parametrisation has a similar lengthy history and formulation. Geometric effects first brought to light fifteen years ago suggest the possibility of polarisation dependent interference between the transition moments of different Cartesian axes. This would manifest itself in the directional dependence of fluorescence intensity for low symmetry crystal hosted rare-earth centres. To date there have been no experimental tests of these predictions and here a case is made for certain transitions of hydrogenated praseodymium doped fluorite. There are certain practical difficulties which must be overcome and these are also addressed.

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盧德成 and Tak-shing Lo. "Two-body operators and correlation crystal field models." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1993. http://hub.hku.hk/bib/B31210922.

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Praetorius, Simon. "Efficient Solvers for the Phase-Field Crystal Equation." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-195532.

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A preconditioner to improve the convergence properties of Krylov subspace solvers is derived and analyzed in this work. This method is adapted to linear systems arising from a finite-element discretization of a phase-field crystal equation.

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Lo, Tak-shing. "Two-body operators and correlation crystal field models /." [Hong Kong : University of Hong Kong], 1993. http://sunzi.lib.hku.hk/hkuto/record.jsp?B13437549.

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Yeung, Yau-yuen. "Alternative parametrization schemes in lanthanide crystal field theory /." [Hong Kong : University of Hong Kong], 1986. http://sunzi.lib.hku.hk/hkuto/record.jsp?B12324863.

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Matias, Jean de Souza. "Crystal electric field efect in non-conventional structures." reponame:Repositório Institucional da UFABC, 2017.

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Orientadora: Profa. Dra. Raquel de Almeida Ribeiro
Dissertação (mestrado) - Universidade Federal do ABC, Programa de Pós-Graduação em Física, 2017.
Em Física da Matéria Condesada, as terras raras apresentam um papel importante em várias aplicações tecnológicas. Suas camadas 4f incompletas possuem enumeras con- gurações diferentes possibilitando o desenvolvimento e melhoramento de propriedades interessantes. Materiais supercondutores, lasers de estado sólido, radares e ímãs permanentes são bons exemplos de dispositivos que utilizam materiais desenvolvidos com terras raras. Quando terras raras são colocadas em um material matriz, as interações entre esses elementos ou entre a matriz e as terras raras fazem com que os seus estados eletrônicos mudem. Estruturas cristalinas apresentam campo elétrico cristalino, cuja teoria desenvolvida no século passado foi amplamente estudada e aplicada à vários grupos de simetria em cristais bulk. Até o momento, porém, muito pouco tem sido estudado a respeito de como o campo elétrico de estruturas não convencionais, como quasicristias e nanocristais, afeta os autoestados das terras raras. Portanto, o objetivo desse projeto foi analizar o efeito de campo elétrico cristalino em dois tipos de materiais: Nanopartículas cúbicas com tamanho de 8 nm e quasicristais icosaédricos, bem como seu aproximante. Para isso, nanopartículas de NaY1..xRExF4 (RE = Yb, Er, Dy, Gd) foram sintetizadas pelo método de termo-decomposição e quasicristais de Au-Al-Yb foram crescidos em forno a arco. Para a determinação parâmetros de campo elétrico cristalino Bm n , foram feitos ajustes das curvas de magnetização dependentes da temperatura e do campo magnético aplicado. Além disso, para os quasicristais foi encontrado um grupo de simetria pontual equivalente e seus parâmetros de campo elétrico cristalino foram comparados com os de seus aproximantes. Com isso, observou-se que somente parâmetros de segunda ordem apresentaram uma diferença signicativa quando comparados entre essas duas estruturas; B0 2 é 20 vezes maior para a estrutura quasicristalina. Para as nanopartículas cúbicas, uma Hamiltoniana total foi proposta e com isso foi feita um simulação para determinar a separação total dos níveis de energia da camada incompleta 4f das terras raras. Além disso, o espectro de Up conversion foi medido e comparado com a simulação teórica. A largura de linha do espectro teórico, 470 20 K, para a transição 4S3=2 ! 4I15=2 , é comparável aos resultados empíricos, 650 50 K. O estado fundamental dos sistemas foi conrmado pela técnica de Ressonância Eletrônica de Spin. Dessa forma, foi estabelecida uma realação de como a separação total dos multipletos-J afeta a emissão de Up conversion destas NP's.
In Condensed Matter Physics, rare earth elements play an important role in several technological applications. Their complex 4f unfullled shell presents numerous dierent congurations, making possible to engineer or tune interesting properties. Superconductors, solid state lasers, radars and permanent magnets are some examples of cutting edge devices using materials developed with rare earth elements. When a rare earth ion is placed in a host material, their interactions with each other or with the host lattice are responsible for the arrangement of their electronic state. Crystalline structures exhibit the crystal eld eect, whose theory developed in the last century has been largely applied and studied to various point group symmetries in bulk crystals. However, there is a lack of researches in how the electric eld of non-conventional host lattices, such as quasicrystals and nanocrystals, aect rare earth's eigenstates. Therefore, the aim of this project was to analyze the crystal eld eect in two dierent kind of materials: Cubic nanoparticles with 8 nm in size and icosahedral bulk quasicristals, as well as their crystal approximant. For that, NaY1..xRExF4 (RE = Yb, Er, Dy, Gd) nanoparticles were synthesized by temperature decomposition and Au-Al- Yb quasicrystals were grown by arc-melting. Fittings of the thermal and eld dependent magnetization were used to determine the crystal electric eld parameters Bmn . In the quasicrystal material case, an equivalent point group symmetry was obtained and their crystal electric eld parameters were compared with the ones of their approximant. Only parameters of second order substantially diered between both structures, B02 was found out to be around 20 times larger than that for the approximant. Moreover, in the cubic nanostructures case, the overall splitting of the 4f unfullled shell of the RE elements was determined diagonalizing a proposed total Hamiltonian, whose terms include the Crystal Electric Field parameters. In addition, the up-conversion light emission signal was acquired and compared with a theoretical simulation. The theoretical up-conversion light emission line-width found out as 471 20 K, for the transition 4S3=2 ! 4I15=2 , is comparable to empirical results, 650 50 K. The ground state of the systems was conrmed by Electron Spin Resonance analysis. In this case, a relation with how the overall energy splitting of the J-multiplets aect the UC conversion light emission of theses NP's was established.

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Zeis, Roswitha. "Single crystal field-effect transistors based on layered semiconductors." [S.l.] : [s.n.], 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=975775405.

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Hashim, K. I. "A study of crystal growth by field emission microscopy." Thesis, Bangor University, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.380230.

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Books on the topic "Crystal field"

1

Mulak, J. The effective crystal field potential. Oxford [England]: Elsevier, 2000.

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Burns, Roger G. Mineralogical applications of crystal field theory. 2nd ed. Cambridge [England]: Cambridge University Press, 1993.

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B, McFadden Geoffrey, Wheeler A. A, and National Institute of Standards and Technology (U.S.), eds. A phase-field model with convection: Numerical simulations. [Gaithersburg, MD]: U.S. Dept. of Commerce, Technology Administration, National Institute of Standards and Technology, 2000.

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B, McFadden Geoffrey, Wheeler A. A, and National Institute of Standards and Technology (U.S.), eds. A phase-field model with convection: Numerical simulations. [Gaithersburg, MD]: U.S. Dept. of Commerce, Technology Administration, National Institute of Standards and Technology, 2000.

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B, McFadden Geoffrey, Wheeler A. A, and National Institute of Standards and Technology (U.S.), eds. A phase-field model with convection: Numerical simulations. [Gaithersburg, MD]: U.S. Dept. of Commerce, Technology Administration, National Institute of Standards and Technology, 2000.

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B, McFadden Geoffrey, Wheeler A. A, and National Institute of Standards and Technology (U.S.), eds. A phase-field model with convection: Numerical simulations. [Gaithersburg, MD]: U.S. Dept. of Commerce, Technology Administration, National Institute of Standards and Technology, 2000.

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B, McFadden Geoffrey, Wheeler A. A, and National Institute of Standards and Technology (U.S.), eds. A phase-field model with convection: Numerical simulations. [Gaithersburg, MD]: U.S. Dept. of Commerce, Technology Administration, National Institute of Standards and Technology, 2000.

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Fowler, H. A. Growth model for filamentary streamers in an ambient field. Gaithersburg, MD: U.S. Dept. of Commerce, Technology Administration, National Institute of Standards and Technology, 2000.

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Avram, Nicolae M., and Mikhail G. Brik, eds. Optical Properties of 3d-Ions in Crystals: Spectroscopy and Crystal Field Analysis. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-30838-3.

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Avram, Nicolae M. Optical Properties of 3d-Ions in Crystals: Spectroscopy and Crystal Field Analysis. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013.

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Book chapters on the topic "Crystal field"

1

Keppler, Hans. "Crystal Field Theory." In Encyclopedia of Earth Sciences Series, 1–4. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-39193-9_316-1.

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Keppler, Hans. "Crystal Field Theory." In Encyclopedia of Earth Sciences Series, 340–43. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-39312-4_316.

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Morrison, C. A. "Crystal-Field Interactions--Phenomenological Theory of Crystal Fields." In Lecture Notes in Chemistry, 81–88. Berlin, Heidelberg: Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/978-3-642-93376-9_8.

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Morrison, C. A. "Miscellaneous Crystal-Field Effects." In Lecture Notes in Chemistry, 143–52. Berlin, Heidelberg: Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/978-3-642-93376-9_15.

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Skomski, Ralph, Priyanka Manchanda, and Arti Kashyap. "Anisotropy and Crystal Field." In Handbook of Magnetism and Magnetic Materials, 1–83. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-63101-7_3-1.

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Skomski, Ralph, Priyanka Manchanda, and Arti Kashyap. "Anisotropy and Crystal Field." In Handbook of Magnetism and Magnetic Materials, 103–85. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-63210-6_3.

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Nakayama, Naofumi, and Hitoshi Goto. "Molecular Crystal Calculation Prospects for Structural Phase Transitions." In The Materials Research Society Series, 179–208. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-0260-6_10.

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AbstractTo establish the theory of soft crystals, computational chemistry must be applied to analyze the structural phase transitions of molecular crystals and develop new methodologies. The accuracy of first-principles calculations for molecular crystals has rapidly improved over the last decade with the contribution of the Cambridge Crystallographic Data Centre blind test, which predicts the crystal structure from the structural formula. However, it is often difficult to apply first-principles calculations to large molecular crystals, such as typical soft crystals, because of the computational cost. In this chapter, we review the applicability of crystal force field calculations as an alternative method for theoretically analyzing molecular crystals. We also introduce some examples of our previous collaborations and discuss the promising methodologies to elucidate the soft crystal phenomena.

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Meyer, B. K. "ZnO: crystal-field splitting energy." In New Data and Updates for IV-IV, III-V, II-VI and I-VII Compounds, their Mixed Crystals and Diluted Magnetic Semiconductors, 583. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-14148-5_324.

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Maekawa, S., S. Kashiba, S. Takahashi, and M. Tachiki. "Kondo Effect versus Crystal Field." In Springer Series in Solid-State Sciences, 90–99. Berlin, Heidelberg: Springer Berlin Heidelberg, 1985. http://dx.doi.org/10.1007/978-3-642-82618-4_6.

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Seo, Jooyeok, Myeonghun Song, Hwajeong Kim, and Youngkyoo Kim. "Liquid Crystal-Integrated-Organic Field-Effect Transistors for Ultrasensitive Sensors." In Liquid Crystal Sensors, 123–44. Boca Raton, FL: CRC Press, [2017] | Series: Liquid crystals book series: CRC Press, 2017. http://dx.doi.org/10.1201/9781315120539-6.

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Conference papers on the topic "Crystal field"

1

Plapp, Mathis, W. Wang, Katsuo Tsukamoto, and Di Wu. "Phase-Field Simulations of Crystal Growth." In SELECTED TOPICS ON CRYSTAL GROWTH: 14th International Summer School on Crystal Growth. AIP, 2010. http://dx.doi.org/10.1063/1.3476229.

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Kobayashi, Ryo, W. Wang, Katsuo Tsukamoto, and Di Wu. "A brief introduction to phase field method." In SELECTED TOPICS ON CRYSTAL GROWTH: 14th International Summer School on Crystal Growth. AIP, 2010. http://dx.doi.org/10.1063/1.3476232.

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Miura, Hitoshi, Etsuro Yokoyama, Katsuo Tsukamoto, W. Wang, Katsuo Tsukamoto, and Di Wu. "Introduction to Phase-Field Model and Its Applications in the Fields of Crystal Growth and Planetary Science." In SELECTED TOPICS ON CRYSTAL GROWTH: 14th International Summer School on Crystal Growth. AIP, 2010. http://dx.doi.org/10.1063/1.3476237.

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Hehlen, Markus P. "Crystal-field effects in fluoride crystals for optical refrigeration." In OPTO, edited by Richard I. Epstein and Mansoor Sheik-Bahae. SPIE, 2010. http://dx.doi.org/10.1117/12.845626.

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Ryzhkova, Anna V., Pratibha Ramarao, Maryam Nikkhou, and Igor Muševič. "Electric field tuning of ferroelectric liquid-crystal microlaser." In Emerging Liquid Crystal Technologies XV, edited by Liang-Chy Chien and Dirk J. Broer. SPIE, 2020. http://dx.doi.org/10.1117/12.2545802.

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Wang, Hongbo, and William S. Oates. "A Phase Field Analysis of Thermomechanically Coupled Liquid Crystal Elastomers." In ASME 2009 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. ASMEDC, 2009. http://dx.doi.org/10.1115/smasis2009-1324.

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A nonlinear phase field approach is developed to investigate micron scale liquid crystal structure evolution within an elastomer network. The polymer network is described by hyperelastic constitutive relations while a set of configurational forces are introduced to simulate the liquid crystals. A general theoretical framework is given which illustrates coupling between the liquid crystal domains and elastomer without introducing explicit phenomenological coupling constants. The model is implemented numerically using a finite element phase field approach. Problems involving thermal gradients are reviewed to illustrate bending behavior due to liquid crystal reorientation. This is shown to also have implications on photomechanical liquid crystal elastomers.

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Meyer, Claire, Ivan N. Dozov, Irena Dokli, Anamarija Knezevic, Andreja Lesac, Patrick Davidson, and Geoffrey R. Luckhurst. "Electric-field effects in the twist-bend nematic phase." In Emerging Liquid Crystal Technologies XIII, edited by Igor Muševič, Liang-Chy Chien, Dirk J. Broer, and Vladimir G. Chigrinov. SPIE, 2018. http://dx.doi.org/10.1117/12.2301296.

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Xiang, Xiao, Michael Escuti, and Jihwan Kim. "Wide-field-of-view nanoscale Bragg liquid crystal polarization gratings." In Emerging Liquid Crystal Technologies XIII, edited by Igor Muševič, Liang-Chy Chien, Dirk J. Broer, and Vladimir G. Chigrinov. SPIE, 2018. http://dx.doi.org/10.1117/12.2303994.

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Walczak, Andrzej, Edward Nowinowski-Kruszelnicki, and Aleksander Kiezun. "Director field in a liquid crystal: direct measurement method." In Liquid Crystals, edited by Jolanta Rutkowska, Stanislaw J. Klosowicz, Jerzy Zielinski, and Jozef Zmija. SPIE, 1998. http://dx.doi.org/10.1117/12.300000.

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Sakai, Kyosuke, Takeaki Yamamoto, Tatsuya Omura, and Keiji Sasaki. "Quadrupole Field in Plasmonic Crystal." In Frontiers in Optics. Washington, D.C.: OSA, 2015. http://dx.doi.org/10.1364/fio.2015.fth1b.4.

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Reports on the topic "Crystal field"

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Glushko, E. Ya, and A. N. Stepanyuk. The multimode island kind photonic crystal resonator: states classification. SME Burlaka, 2017. http://dx.doi.org/10.31812/0564/1561.

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In this work, we consider a new calculation method to solve the eigenvalue problem for electromagnetic field in finite 2D structures including the modes distribution through the system. The field amplitude distribution is valuable if the signal energy inside the system should be transformed in most effective way. The method proposed for finite resonators operates with open boundary conditions that are important to account the electromagnetic field non-periodicity in a finite system.

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Lim, Hojun, Steven J. Owen, Fadi F. Abdeljawad, Byron Hanks, and Corbett Chandler Battaile. Creating physically-based three-dimensional microstructures: Bridging phase-field and crystal plasticity models. Office of Scientific and Technical Information (OSTI), September 2015. http://dx.doi.org/10.2172/1215797.

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Zhu, Xiaoyang. Spectroscopy of Charge Carriers and Traps in Field-Doped Single Crystal Organic Semiconductors. Office of Scientific and Technical Information (OSTI), December 2014. http://dx.doi.org/10.2172/1165194.

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Zhu, Xiaoyang, and Daniel Frisbie. Spectroscopy of Charge Carriers and Traps in Field-Doped Single Crystal Organic Semiconductors. Office of Scientific and Technical Information (OSTI), March 2017. http://dx.doi.org/10.2172/1351111.

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Einfeld, W. Glass bead size and morphology characteristics in support of Crystal Mist field experiments. Office of Scientific and Technical Information (OSTI), March 1995. http://dx.doi.org/10.2172/41392.

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Stevens, Sally B., and Clyde A. Morrison. Theoretical Crystal-Field Calculations for Rare-Earth Ions in III-V semiconductor Compounds. Fort Belvoir, VA: Defense Technical Information Center, October 1991. http://dx.doi.org/10.21236/ada243098.

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Loewenhaupt, M., P. Tils, W. Hahn, and C. K. Loong. Crystal field and exchange interactions in DyT{sub 4}Al{sub 8} (T = Fe and Mn). Office of Scientific and Technical Information (OSTI), December 1994. http://dx.doi.org/10.2172/28356.

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Paschke, Timothy M. Study in Calcium Carbonate Crystal Formation at the Air/Water Interface in the Presence of a Magnetic Field. Fort Belvoir, VA: Defense Technical Information Center, September 2001. http://dx.doi.org/10.21236/ada388640.

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Reinson, G. E. Facies analysis and reservoir geometry of the Crystal Viking Field, Tp. 45 and 46, Rg. 3 and 4W5, Central Alberta. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1985. http://dx.doi.org/10.4095/130013.

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Pisani, William, Dane Wedgeworth, Michael Roth, John Newman, and Manoj Shukla. Exploration of two polymer nanocomposite structure-property relationships facilitated by molecular dynamics simulation and multiscale modeling. Engineer Research and Development Center (U.S.), March 2023. http://dx.doi.org/10.21079/11681/46713.

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Polyamide 6 (PA6) is a semi-crystalline thermoplastic used in many engineering applications due to good strength, stiffness, mechanical damping, wear/abrasion resistance, and excellent performance-to-cost ratio. In this report, two structure-property relationships were explored. First, carbon nanotubes (CNT) and graphene (G) were used as reinforcement molecules in simulated and experimentally prepared PA6 matrices to improve the overall mechanical properties. Molecular dynamics (MD) simulations with INTERFACE and reactive INTERFACE force fields (IFF and IFF-R) were used to predict bulk and Young's moduli of amorphous PA6-CNT/G nanocomposites as a function of CNT/G loading. The predicted values of Young's modulus agree moderately well with the experimental values. Second, the effect of crystallinity and crystal form (α/γ) on mechanical properties of semi-crystalline PA6 was investigated via a multiscale simulation approach. The National Aeronautics and Space Administration, Glenn Research Center's micromechanics software was used to facilitate the multiscale modeling. The inputs to the multiscale model were the elastic moduli of amorphous PA6 as predicted via MD and calculated stiffness matrices from the literature of the PA6 α and γ crystal forms. The predicted Young's and shear moduli compared well with experiment.

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