Relevant bibliographies by topics / Incommensurate phase

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Incommensurate phase'

Author: Grafiati
Published: 4 June 2021
Last updated: 9 February 2022

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Journal articles on the topic "Incommensurate phase"

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Kubli, Martin, Matteo Savoini, Elsa Abreu, Bulat Burganov, Gabriel Lantz, Lucas Huber, Martin Neugebauer, et al. "Kinetics of a Phonon-Mediated Laser-Driven Structural Phase Transition in Sn2P2Se6." Applied Sciences 9, no. 3 (February 4, 2019): 525. http://dx.doi.org/10.3390/app9030525.

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We investigate the structural dynamics of the incommensurately modulated phase of Sn 2P 2Se 6 by means of time-resolved X-ray diffraction following excitation by an optical pump. Tracking the incommensurable distortion in the time domain enables us to identify the transport effects leading to a complete disappearance of the incommensurate phase over the course of 100 ns. These observations suggest that a thin surface layer of the high-temperature phase forms quickly after photo-excitation and then propagates into the material with a constant velocity of 3.7 m/s. Complementary static structural measurements reveal previously unreported higher-order satellite reflection in the incommensurate phase. These higher-order reflections are attributed to cubic vibrational terms in the Hamiltonian.
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Caracas, Razvan. "A database of incommensurate phases." Journal of Applied Crystallography 35, no. 1 (January 22, 2002): 120–21. http://dx.doi.org/10.1107/s0021889801017083.

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A database of incommensurate phases is currently available at http://www.mapr.ucl.ac.be/~crystal/index.html. The present database offers a fast direct retrieval system for structural, physical and bibliographical data of incommensurate phases. The database contains data about inorganic, non-composite, non-magnetic and non-superconducting incommensurate phases only. Classification is according to the physical mechanisms responsible for the incommensurate phase transition. The main classes of incommensurate phases thus obtained are: theA2BX4dielectrics family, zone-centre lock-in transition phases, cooperative Jahn–Teller incommensurates, tetragonal tungsten bronzes, charge-density wave systems and miscellaneous incommensurate phases. The latter class, because of the lack of available data, is classified on a chemical basis in several subclasses: silicates, perovskites, Mn-bearing oxides, other oxides, group VI compounds, intermetallics and other compounds. The database contains a brief description of the main physical, chemical and structural features of each phase, as stated in the literature. This description is very material- and bibliography-dependent and it is preceded by the phase transition sequence.
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Gągor, Anna. "Phase transitions in ferroelectric 4-aminopyridinium tetrachloroantimonate(III) – revisited." Acta Crystallographica Section B Structural Science, Crystal Engineering and Materials 74, no. 2 (March 21, 2018): 217–25. http://dx.doi.org/10.1107/s2052520618003669.

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New X-ray diffraction studies on the crystal structure of ferroelectric [4-NH2C5H4NH][SbCl4] indicate that in the broad temperature range from 240 to 304 K covering the three intermediate phases, the crystal structure is modulated. Phase II is incommensurately modulated with modulation vectorq= βb*, β varying from 0.60 to 0.66 and monoclinicC2/c(0β0)s0 superspace group. Ferroelectric phase III is commensurate withq= 2\over 3b*andCc(0β0)0 symmetry. Polar phase IV is incommensurately modulated with β varying from 0.66 to 0.70 andCc(0β0)0 superspace group. In all phases only first-order satellites are observed along theb*direction. Two types of periodic deformation are present in the structure of modulated phases. The 4-aminopyridinium cations are subjected to occupation modulation whereas [SbCl4]−nchains are displacively modulated. The paraelectric–ferroelectric phase transition is an example of the incommensurate–commensurate transition of the lock-in type. A new mechanism for this transformation is proposed.
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Jacobs, A. E. "The incommensurate phase of." Journal of Physics: Condensed Matter 8, no. 5 (January 29, 1996): 517–26. http://dx.doi.org/10.1088/0953-8984/8/5/002.

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Weigel, Dominique. "Commensurate incommensurate phase transitions." Phase Transitions 16, no. 1-4 (June 1989): 341–49. http://dx.doi.org/10.1080/01411598908245708.

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Markgraf, S. A., C. A. Randall, A. S. Bhalla, and R. J. Reeder. "Incommensurate phase in Ba2TiSi2O8." Solid State Communications 75, no. 10 (September 1990): 821–24. http://dx.doi.org/10.1016/0038-1098(90)90758-4.

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Röthlisberger, Francois, Friedrich Seifert, and Michael Czank. "Chemical control of the commensurate-incommensurate phase transition in synthetic melilites." European Journal of Mineralogy 2, no. 5 (October 4, 1990): 585–94. http://dx.doi.org/10.1127/ejm/2/5/0585.

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Aizu, Kêitsiro. "Twofold Incommensurate Phase as Analogs of Semicommensurate Phases. On the Transitions [Prototypic→Ordinarily (or Onefold) Incommensurate →Twofold Incommensurate]." Journal of the Physical Society of Japan 55, no. 5 (May 15, 1986): 1663–70. http://dx.doi.org/10.1143/jpsj.55.1663.

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Morelli, Rose, and M. B. Walker. "Novel mechanism for the incommensurate-to-incommensurate phase transition inNbTe4." Physical Review Letters 62, no. 13 (March 27, 1989): 1520–23. http://dx.doi.org/10.1103/physrevlett.62.1520.

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Chen, Z. Y., and M. B. Walker. "Superspace symmetry modes and incommensurate-to-incommensurate phase transition inNbTe4." Physical Review B 40, no. 13 (November 1, 1989): 8983–94. http://dx.doi.org/10.1103/physrevb.40.8983.

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Dissertations / Theses on the topic "Incommensurate phase"

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Moss, George W. "Mathematical Models of the Alpha-Beta Phase Transition of Quartz." Diss., Virginia Tech, 1999. http://hdl.handle.net/10919/28607.

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We examine discrete models with hexagonal symmetry to compare the sequence of transitions with the alpha-inc-beta phase transition of quartz. We examine a model by Parlinski which employs interactions of nearest and next-nearest neighbor atoms. We numerically determine the configurations which lead to minimum energy for a range of parameters. We then use Golubitsky's results on systems with hexagonal symmetry to derive the bifurcation diagram for Parlinski's model. Finally, we study a large class of modifications to Parlinski's model and show that all such modifications have the same bifurcation picture as the original model.
Ph. D.
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Niestemski, Liang Ren. "Incommensurate Valence Bond Density Waves in the Glassy Phase of Underdoped Cuprates." Thesis, Boston College, 2011. http://hdl.handle.net/2345/2626.

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Thesis advisor: Ziqiang Wang
One of the most unconventional electronic states in high transition temperature cuprate superconductors is the pseudogap state. In the temperature versus doping phase diagram, the pseudogap state straddles across the antiferromagnetic (AF) state near half filling and the superconducting (SC) dome on the hole doped side above the transition temperature Tc. The relationship between the pseudogap state and these two well known states - the AF state and the SC state is believed to be very important for understanding superconductivity and the emergent quantum electronic matter in doped Mott insulators. The pseudogap is characterized by the emergence of a soft gap in the single-particle excitation spectrum in the normal state in the temperature range between Tc and a characteristic temperature T*, i.e. Tc < T < T*. The most puzzling feature of the pseudogap is the nodal-antinodal dichotomy. Observed by ARPES in momentum space, the Fermi surface is gapped out in the antinodal region leaving a Fermi arc of gapless excitations near the nodes. Whether the pseudogap is an incoherent superconducting gap (onegap scenario) or it is a different gap governed by other mechanisms, other than superconductivity, (two-gap scenario) is still under debate. In this thesis I study the particle-particle channel and the particle-hole channel of the valence bond fluctuations away from half filling. Based on a strong-coupling analysis of the t-J model, I argue that the superexchange interaction J induced incommensurate bond centered density wave order is the driving mechanism for the pseudogap state. Low energy density of states (DOS) are eliminated by multiple incommensurate scatterings in the antinodal region at the Fermi level. I show that the interplay between the incommensurate bond centered d-wave density wave instability and the intrinsic electronic inhomogeneity in real cuprate materials is responsible for the observed pseudogap phenomena. Utilizing the spatially unrestricted Gutzwiller approximation, I show that the off-stoichiometric doping induced electrostatic disorder pins the low-energy d-wave bond density fluctuations, resulting in a VBG phase. The antinodal Fermi surface (FS) sections are gapped out, giving rise to a genuine normal state Fermi arc. The length of the Fermi arc shrinks with underdoping below the temperature T* determined by thermal filling of the antinodal pseudogap. Below Tc, the d-wave superconducting gap due to singlet pairing coexists and competes with the VBG pseudogap. The spatial, momentum, temperature and doping dependence of these two gaps are consistent with recent ARPES and STM observations in underdoped and chemically substituted cuprates. The temperature versus doping phase diagram captures the salient properties of the pseudogap phenomena and provides theoretical support for the two-gap scenario. In addition to resolving the complexities of the quantum electronic states in hole-doped cuprates, my unified theory elucidates the important role of the interplay between the strong electronic correlation and the intrinsic electronic disorder in doped transition metal oxides
Thesis (PhD) — Boston College, 2011
Submitted to: Boston College. Graduate School of Arts and Sciences
Discipline: Physics
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Bouchard, Alexandre. "Composés inter-halogènes sous pression: étude des transformations structurales dans le monobromure d’iode sous forme dense." Thesis, Université d'Ottawa / University of Ottawa, 2012. http://hdl.handle.net/10393/20697.

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La famille des composés halogènes et inter-halogènes représentent des solides moléculaires adoptant des phases denses communes avec des solides moléculaires diatomiques comme l’azote et l’hydrogène. Parmi les transformations structurales et électroniques induites sous haute pression et observées dans ces solides, on note, entre autres, la dissociation moléculaire et la métallisation. De plus, l’étude des phases denses de l’iode a permis récemment l’observation d’une structure cristalline possédant une modulation dite incommensurable, c’est-à-dire une modulation possédant une périodicité différente de celle de la structure cristalline, jetant ainsi une lumière nouvelle sur le processus de dissociation moléculaire dans les solides halogènes. Dans ce mémoire, on propose d’étudier les changements structuraux dans monobromure d’iode (IBr), un composé inter-halogène possédant des propriétés structurales semblables à celles de deux composés halogènes, soit l’iode (I2) et le brome (Br2) sous leur forme solide. Des expériences de diffraction des rayons X de poudres en utilisant un rayonnement synchrotron ont été réalisées à température ambiante sur l’IBr en variant la pression jusqu’aux environs de 60 GPa. La nature chimique particulière du composé IBr a nécessité la mise au point de techniques de chargement d’échantillon destinées à préserver l’intégrité chimique de la substance utilisée. On rapporte également l’observation d’une phase de l’IBr présentant une modulation incommensurable. Les phases observées dans l’IBr permettent d’établir des parallèles avec les phases denses rapportées dans I2 et Br2 par le biais d’un modèle phénoménologique décrivant la séquence structurale des solides halogènes sous forme condensée.
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Barré, Sylvie. "ETUDE DE LA PHASE INCOMMENSURABLE DE Ba2NaNb5O15 PAR MICROSCOPIE ELECTRONIQUE : influence des defauts sur la transition." Toulouse 3, 1987. http://www.theses.fr/1987TOU30244.

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Apres une presentation des proprietes generales des systemes incommensurables, rappel des problemes particuliers poses par la phase incommensurable de ba::(2)nanb::(5)o::(15). Etude experimentale par microscopie electronique, entre la temperature ambiante et 350c. Le comportement observe peut etre explique en considerant que vers 230c, la phase incommensurable est constituee d'un melange de deux phases metastables. En utilisant l'effet de memoire, ces phases ont pu etre stabilisees et les auteurs ont ainsi obtenu des precisions sur leurs structures. Cet effet de memoire est interprete par la presence de defauts qui interagissent avec la modulation modifiant les stabilites relatives des deux phases. Etude de ce dernier point en creant des defauts par irradiation par des electrons (2 mev)
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Mogeon, François. "Propriétés statiques et comportement irréversible de la phase incommensurable du quartz." Grenoble 1, 1988. http://www.theses.fr/1988GRE10132.

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Mesure de la variation, en fonction de la temperature, des grandeurs caracteristiques de la phase incommensurable: dilatation, module et direction du vecteur d'onde de modulation. Interpretation dans le cadre d'une theorie phenomenologique. La resolution de la methode a permis l'observation directe d'une phase mono q en l'absence de contraintes exterieures. Une correlation entre la variation du vecteur d'onde de modulation et celle de la birefringence en fonction de la temperature a ete etablie par diffraction de rayons gamma couplee avec mesure de birefringence
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Behrendt, Karsten. "Der Einfluss von Defekten auf das Schaltverhalten ferroelektrisch modulierter Substanzen." Doctoral thesis, Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2015. http://hdl.handle.net/11858/00-1735-0000-0028-873E-C.

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Boudot, Cécile. "Transitions de phase sous champ électrique dans la thiourée." Nancy 1, 1988. http://www.theses.fr/1988NAN10087.

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Étude des propriétés diélectriques de la thiourée hydrogénée par mesure de la constante diélectrique, de la polarisation, de la réponse pyroélectrique et du cycle d'hystérésis. Établissement du diagramme de phases dans le plan (E,T). Analyse théorique à partir d'une fonctionnelle d'énergie dérivée du modèle phénoménologique de Landau
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Arapan, Sergiu. "Understanding Physical Reality via Virtual Experiments." Doctoral thesis, Uppsala universitet, Institutionen för fysik och materialvetenskap, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-9314.

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In this thesis I have studied some problems of condensed matter at high pressures and temperatures by means of numerical simulations based on Density Functional Theory (DFT). The stability of MgCO3 and CaCO3 carbonates at the Earth's mantle conditions may play an important role in the global carbon cycle through the subduction of the oceanic crust. By performing ab initio electronic structure calculations, we observed a new high-pressure phase transition within the Pmcn structure of CaCO3. This transformation is characterized by the change of the sp-hybridization state of carbon atom and indicates a change to a new crystal-chemical regime. By performing ab initio Molecular Dynamics simulations we show the new phase to be stable at 250 GPa and 1000K. Thus, the formation of sp3 hybridized bonds in carbonates can explain the stability of MaCO3 and CaCO3 at pressures corresponding to the Earth's lower mantle conditions. We have also calculated phase transition sequence in CaCO3, SrCO3 and BaCO3, and have found that, despite the fact that these carbonates are isostructural and undergo the same type of aragonite to post-aragonite transition, their phase transformation sequences are different at high pressures. The continuous improvement of the high-pressure technique led to the discovery of new composite structures at high pressures and complex phases of many elements in the periodic table have been determined as composite host-guest incommensurate structures. We propose a procedure to accurately describe the structural parameters of an incommensurate phase using ab initio methods by approximating it with a set of analogous commensurate supercells and exploiting the fact that the total energy of the system is a function of structural parameters. By applying this method to the Sc-II phase, we have determined the incommensurate ratio, lattice parameters and Wyckoff positions of Sc-II in excellent agreement with the available experimental data. Moreover, we predict the occurrence of an incommensurate high-pressure phase in Ca from first-principle calculations within this approach. The implementation of DFT in modern electronic structure calculation methods proved to be very successful in predicting the physical properties of a solid at low temperature. One can rigorously describe the thermodynamics of a crystal via the collective excitation of the ionic lattice, and the ab initio calculations give an accurate phonon spectra in the quasi-harmonic approximation. Recently an elegant method to calculate phonon spectra at finite temperature in a self-consistent way by using first principles methods has been developed. Within the framework of self-consistent ab initio lattice dynamics approach (SCAILD) it is possible to reproduce the observed stable phonon spectra of high-temperature bcc phase of Ti, Zr and Hf with a good accuracy. We show that this method gives also a good description of the thermodynamics of hcp and bcc phases of Ti, Zr and Hf at high temperatures, and we provide a procedure for the correct estimation of the hcp to bcc phase transition temperature.
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Akkermans, Éric. "Propagation d'ondes dans les milieux désordonnés." Grenoble 1, 1986. http://www.theses.fr/1986GRE10050.

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Les phenomenes etudies font intervenir la phase de l'onde et la dimensionalite de l'espace de propagation. Dans le cas des systemes uni et bidimensionnels, les ondes subissant des collisions multiples elastiques interferent fortement et conduisent a des modes propres exponentiellement localises. Leur structure est etudiee sur la base d'un modele particulier de potentiel incommensurable. Le transport des phonons et des electrons dans les systemes unidimensionnels desordonnes a ete plus generalement caracterise
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Leung, H. T. "The incommensurate phases in intermediate plagioclase feldspars." Thesis, University of Cambridge, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.360914.

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Books on the topic "Incommensurate phase"

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Kociński, Jerzy. Commensurate and incommensurate phase transitions. Amsterdam: Elsevier, 1990.

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Tolédano, Jean-Claude. The Landau theory of phase transitions: Application to structural, incommensurate, magnetic, and liquid crystal systems. Singapore: World Scientific, 1987.

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R, Blinc, and Levani͡u︡k A. P. 1933-, eds. Incommensurate phases in dielectrics. Amsterdam: North-Holland, 1986.

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Pressprich, Mark Robert. Incommensurate phases, phase transitions and structural chemistry of [Pn(CH₃)₄]₂MX₄ salts. 1990.

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Bishop, A. R. Special Issue on Incommensurate Phase Transitions: A special issue of the journal Ferroelectrics. Routledge, 1986.

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Landau Theory of Phase Transitions: Applicability to Structural, Incommensurate, Magnetic and Liquid Crystal Systems (World Scientific Lecture Notes). World Scientific Pub Co Inc, 1987.

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The Landau Theory of Phase Transitions: Application to Structural, Incommensurate, Magnetic, and Liquid Crystal Systems (World Scientific Lecture Notes in Physics). World Scientific Pub Co Inc, 1987.

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Blinc, R. Incommensurate Phases in Dielectrics : Materials. North-Holland, 1986.

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Blinc, R. Incommensurate Phases in Dielectrics : Fundamentals. North-Holland, 1986.

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Incommensurate Phases in Dielectrics - 2. Materials. Elsevier, 1986. http://dx.doi.org/10.1016/c2009-0-15414-4.

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Book chapters on the topic "Incommensurate phase"

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Izyumov, Yu A., and V. N. Syromyatnikov. "Incommensurate Periodicity Phases." In Phase Transitions and Crystal Symmetry, 301–57. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-1920-4_9.

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Ratna, B. R., R. Shashidhar, and V. N. Raja. "An Incommensurate Smectic A Phase." In NATO ASI Series, 259–70. New York, NY: Springer US, 1987. http://dx.doi.org/10.1007/978-1-4757-0184-5_24.

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Strukov, Boris A., and Arkadi P. Levanyuk. "Ferroelectrics with an Incommensurate Phase." In Ferroelectric Phenomena in Crystals, 227–65. Berlin, Heidelberg: Springer Berlin Heidelberg, 1998. http://dx.doi.org/10.1007/978-3-642-60293-1_11.

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Scott, J. F. "Nonequilibrium Phenomena at Incommensurate Phase Transitions." In NATO ASI Series, 473–81. Boston, MA: Springer US, 1986. http://dx.doi.org/10.1007/978-1-4613-2181-1_32.

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Hu, B., J. Shi, and B. Lin. "Universality in Commensurate-Incommensurate Phase Transitions." In Phase Transitions and Relaxation in Systems with Competing Energy Scales, 335–38. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1908-5_15.

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Dolino, G. "Incommensurate Phase Transitions in Quartz and Berlinite." In Structural and Magnetic Phase Transitions in Minerals, 17–38. New York, NY: Springer New York, 1988. http://dx.doi.org/10.1007/978-1-4612-3862-1_2.

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Walker, M. B., and Rose Morelli. "Theory of Phase Transition Between Two Incommensurate Phases in NbTe4." In Geometry and Thermodynamics, 307–9. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4615-3816-5_26.

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Schilling, R. "Hierarchical Melting of One-Dimensional Incommensurate Structures." In Phase Transitions and Relaxation in Systems with Competing Energy Scales, 285–316. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1908-5_13.

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Ishibashi, Yoshihiro. "A Phenomenological Theory of the Transition Sequence including an Incommensurate (Commensurate) Phase Sandwiched by Reentrant Commensurate (Incommensurate) Phase." In NATO ASI Series, 1–8. New York, NY: Springer US, 1987. http://dx.doi.org/10.1007/978-1-4757-0184-5_1.

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Beale, Paul D. "Two-Dimensional Models of Commensurate-Incommensurate Phase Transitions." In NATO ASI Series, 55–61. New York, NY: Springer US, 1987. http://dx.doi.org/10.1007/978-1-4757-0184-5_6.

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Conference papers on the topic "Incommensurate phase"

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Gonze, X. "First-principles study of crystals exhibiting an incommensurate phase transition." In Fundamental physics of ferroelectrics 2000. AIP, 2000. http://dx.doi.org/10.1063/1.1324453.

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Furtsev, V. G. "Optical non-linearity of the incommensurate phase of Sn2P2(SexS1-x)6." In 16th Congress of the International Commission for Optics: Optics as a Key to High Technology. SPIE, 1993. http://dx.doi.org/10.1117/12.2308768.

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Aslanyan, T. A. "On the dielectric susceptibility calculation in the incommensurate phase of K 2 SeO 4." In International Conference on Laser Physics 2010, edited by Aram V. Papoyan. SPIE, 2010. http://dx.doi.org/10.1117/12.891383.

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Roy, Souvik, and Santanu K. Maiti. "Localization transitions and formation of mixed phase in a two-stranded ladder network modulated with incommensurate site potentials." In 10th Jubilee International Conference of the Balkan Physical Union. Author(s), 2019. http://dx.doi.org/10.1063/1.5090255.

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Suchanska, Malgorzata, Stanislaw Kaluza, Radoslaw Belka, and M. Plaza. "Features of crystals with incommensurate phases." In SPIE Proceedings, edited by Ryszard S. Romaniuk and Krzysztof T. Pozniak. SPIE, 2003. http://dx.doi.org/10.1117/12.531513.

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Sardarly, R. M., O. A. Samedov, A. A. Bayramov, A. P. Abdullayev, and F. T. Salmanov. "About Terahertz Generation on the Superstructures Layers AIIIBIIICVI2 Crystals." In ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-10287.

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In layered crystals of the AIIIBIIICVI2 family the presence of wide temperature ranges is indicated, in which on the primitive translation of the lattice of the initial phase superlattices with periods of 5–15 nm are superimposed. At that, the neutron-diffraction patterns show the presence of superstructural reflections: both reflections that are multiple of the initial translation of the lattice and incommensurable superstructural ones. Our research showed that layered crystals of the TlInS2 family are crystallized with the formation of both incommensurable and commensurate (of the initial translation) superlattices and could be used for the generation of Terahertz radiation.
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Xu, Huifang, Shiyun Jin, and Seungyeol Lee. "BEAUTY AND COMPLEXITY OF LABRADORITE FELDSPARS: THEIR INCOMMENSURATELY MODULATED STRUCTURES AND SUBSOLIDUS PHASE RELATIONS." In GSA Annual Meeting in Phoenix, Arizona, USA - 2019. Geological Society of America, 2019. http://dx.doi.org/10.1130/abs/2019am-339623.

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Reports on the topic "Incommensurate phase"

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Jorgensen, J. D., D. G. Hinks, D. M. Hatch, and R. M. Putnam. Structural phase transitions in BaMo/sub 6/S/sub 8/: Evidence for an incommensurate phase. Office of Scientific and Technical Information (OSTI), January 1986. http://dx.doi.org/10.2172/6363215.

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You might also be interested in the extended bibliographies on the topic 'Incommensurate phase' for particular source types:
Journal articles Dissertations / Theses
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