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Gotowa bibliografia na temat „Solid State Physics - Crystalline Order”

Autor: Grafiati

Data publikacji: 7 września 2023

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Artykuły w czasopismach na temat "Solid State Physics - Crystalline Order"

Laridjani, M., and F. Dénoyer. "Study of geometrical local order in a non-ideal solid solution: an intermediary structure." Journal of Applied Crystallography 37, no. 5 (2004): 716–23. http://dx.doi.org/10.1107/s0021889804014657.

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One of the key obstacles in the progress of certain aspects of solid-state physics is the determination of the nature of irregularities in the atomic network of matter and their correlation with macroscopic properties. In this work, an original structural result is presented, namely the presence of icosahedral clusters in an Al solid solution, as deduced from the analysis of the total Fourier-space image. This work has led to the belief that these non-crystalline clusters create a fundamental irregularity in the network of a non-ideal solid solution.

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Gureva, S. A., A. K. Borisov, V. A. Marikhin, and V. M. Egorov. "Solid-state phase transition in n-alkanes of different parity." Journal of Physics: Conference Series 2086, no. 1 (2021): 012182. http://dx.doi.org/10.1088/1742-6596/2086/1/012182.

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Abstract The kinetics of the first-order solid-state structural transition in monodisperse n-alkanes samples of tricosane C23H48 and tetracosane C24H50 was studied by DSC and FTIR spectroscopy. The initial nuclei location of the new phase was revealed. The process of crystal structure rearrangement is initiated in the interlayers between neighboring lamellar for odd tricosane, while the nanonuclei in even tetracosane arise in the crystalline lamella cores. Thus, the influence of the number evenness of carbon atoms in the n-alkanes chains on the first-order structural phase transition has been proved.

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Podmaniczky, Frigyes, and László Gránásy. "Nucleation and Post-Nucleation Growth in Diffusion-Controlled and Hydrodynamic Theory of Solidification." Crystals 11, no. 4 (2021): 437. http://dx.doi.org/10.3390/cryst11040437.

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Two-step nucleation and subsequent growth processes were investigated in the framework of the single mode phase-field crystal model combined with diffusive dynamics (corresponding to colloid suspensions) and hydrodynamical density relaxation (simple liquids). It is found that independently of dynamics, nucleation starts with the formation of solid precursor clusters that consist of domains with noncrystalline ordering (ringlike projections are seen from certain angles), and regions that have amorphous structure. Using the average bond order parameter q¯6, we distinguished amorphous, medium range crystallike order (MRCO), and crystalline local orders. We show that crystallization to the stable body-centered cubic phase is preceded by the formation of a mixture of amorphous and MRCO structures. We have determined the time dependence of the phase composition of the forming solid state. We also investigated the time/size dependence of the growth rate for solidification. The bond order analysis indicates similar structural transitions during solidification in the case of diffusive and hydrodynamic density relaxation.

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Lee, Byeong-Joo. "Thermodynamic analysis of solid-state metal/Si interfacial reactions." Journal of Materials Research 14, no. 3 (1999): 1002–17. http://dx.doi.org/10.1557/jmr.1999.0134.

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An attempt has been made to interpret the experimentally reported transitions of layer sequences during the Co/Si, Ti/Si, and Ni/Si interfacial reactions in a consistent way, and to build a thermodynamic calculation scheme that enables it. The basic ideas are that the silicide with the highest driving force of formation under a metastable local equilibrium state at an interface would form first at the lowest temperature, and that when several silicides can nucleate simultaneously and compete for growth at an initial stage of a high temperature reaction, the one whose composition is closest to those of surrounding phases would form a continuous interfacial layer first and grow thicker. A critical review of literature information has also been made in order to clarify the first-forming silicide and silicide formation sequence in each metalySi interfacial reaction. The observed first-forming crystalline silicides, CoSi, Ti5Si3, and Ni2Si, in each metalySi interfacial reaction were in agreement with the present prediction based on the first idea. The reason why Co2Si and C49 TiSi2 have frequently been observed in high temperature Co/Si and TiySi reactions as if they were the first-forming crystalline silicides could also be explained based on the second idea. By combining both ideas, a general thermodynamic calculation scheme that can be applied for analysis, rationalization, and even prediction of interfacial reactions between different materials could be suggested.

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Tan, T. Q., Mohd Sobri Idris, Rozana Aina Maulat Osman, Nor Azura Malini Ahmad Hambali, and M. V. Reddy. "Comparison of Structural and Electrical Behaviour of Phospho-Olivine LiNiPO₄ and LiNi_0.8Mn_0.1Co_0.1PO₄ for High Voltage Rechargeable Li-Ion Batteries." Solid State Phenomena 280 (August 2018): 50–57. http://dx.doi.org/10.4028/www.scientific.net/ssp.280.50.

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Phase pure olivine LiNiPO4 and doped LiNi0.8Mn0.1Co0.1PO4 powders have been prepared by conventional solid state route. X-ray diffraction (XRD) combined with Rietveld refinements analysis reveals the formation of LiNiPO4 and doped LiNi0.8Mn0.1Co0.1PO4 with high crystalline nature at high temperature of 950 °C and 1000 °C. The lattice parameters of doped LiNi0.8Mn0.1Co0.1PO4 are significantly larger than LiNiPO4. It has been found out that the estimated crystallite size is in the order of nanometres for both samples. SEM analysis confirms that the particles have connected with each other in random shape and sub-microns size. The particle size has increased as small amount of Mn and Co are doped into LiNiPO4. The AC impedance spectroscopy measurements have revealed that the conductivity of LiNiPO4 is enhanced by around one order of magnitude by doping Mn and Co.

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Vojtěch, Dalibor, Alena Michalcová, and Pavel Novák. "Structural Evolution of Al-Cr Alloy during Processing." Solid State Phenomena 138 (March 2008): 145–52. http://dx.doi.org/10.4028/www.scientific.net/ssp.138.145.

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Aluminium-chromium based alloys are promising candidates for manufacture of light components exposed to elevated temperatures. The work describes properties of Al-6.0wt.%Cr- 2.1wt.%Fe-0.5wt.%Ti alloy. The rapidly solidified powder was prepared by the pressure nitrogen melt atomization. The powder was then subject to heat treatment in order to investigate solid state phase transformations. Compaction of the powder was carried out by hot extrusion after preheating at 450 °C. Microstructure, phase composition and structural transformations on heat treatment were investigated in the as-atomized powder, as well as in the as-extruded alloy. It is found that metastable state of the rapidly solidified powder is characterized by presence of quasi-crystalline phases and supersaturated solid solution. Heating before and during the hot extrusion induces decomposition of the supersaturated solid solution and quasicrystalline to crystalline phase transformations. The hot extruded alloy has a refined recrystallized structure that remains very stable aven after long-term annealing at 400 °C. Mechanical properties of the extruded alloy are discussed in terms of strengthening mechanisms.

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Schmidbaur, Hubert, Theodore Zafiropoulos, Wolfgang Bublak, Paul Burkert, and Frank H. Köhler. "High Resolution and Solid State NMR Investigations of Subvalent Gallium Compounds." Zeitschrift für Naturforschung A 41, no. 1-2 (1986): 315–18. http://dx.doi.org/10.1515/zna-1986-1-258.

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The 71Ga NMR spectra of Ga[GaX4] melts and of solutions in benzene and other hydrocarbons show discrete sharp GaI and broad GaIII resonances. In the light of recent structure determinations, the solution GaI signals must be attributed to bis(arene)Ga+ complexes in which the gallium atom is η6-bonded to the hydrocarbons. The low line widths and strong high field shifts are attributed to an almost spherical shielding of the metal nucleus by the 4 s2 electrons. Solid state 69Ga and 71Ga NMR spectra of Ga[GaCl4] crystalline powder show only Ga1 resonances. While the 71GaI line is rather narrow, the 69GaI line has a complex fine structure. Consistent with the crystal structure of Ga[GaCl4], the Ga1 ion is calculated to have a very low quadrupole coupling constant e2q Q/h = 1.7 ± 0.1 MHz and an asymmetry parameter η = 0.44. Experimental and simulated line shapes (using literature models) are in satisfactory agreement, implying that the 69Ga signal splitting is due to second order quadrupolar effects for the central m = + 1/2 ⇋ - 1/2 transition. The analogous splitting of the 71Ga NMR line is too small to be detected.

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ZHOU, TAO-YU, HUI WANG, XIAO-PING KANG, and XIN-QUAN XIN. "ROOM-TEMPERATURE SOLID-STATE REACTION TO TREE-LIKE FRACTAL NANO-CdS AND THIRD-ORDER NONLINEAR OPTICAL PROPERTIES." Nano 08, no. 04 (2013): 1350035. http://dx.doi.org/10.1142/s1793292013500355.

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A novel tree-like nano-cadmium sulfide (CdS) with the fractal feature is synthesized by solid-state reaction at room temperature from complex precursor with aminotrimethylenephosphonic acid (ATMP) as ligand. The obtained sample is the crystalline cubic beta cadmium sulfide. The tree is composed of nanorods with an average diameter of ca. 95 nm and a length of up to 100–650 nm. The nanorods grow in the asymmetrical "Y" shape. The amount of ATMP plays an important role in the formation of fractal structure. Nonlinear optical (NLO) measurements by the Z-scan technique exhibit that the tree-like fractal nano- CdS has the third-order nonlinear optical properties of both NLO absorption and NLO refraction with self-focusing effect and the optical limiting performance.

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Wang, Yanan, Yong Wang, Jin Cheng, et al. "Recent Advances in the Application of Characterization Techniques for Studying Physical Stability of Amorphous Pharmaceutical Solids." Crystals 11, no. 12 (2021): 1440. http://dx.doi.org/10.3390/cryst11121440.

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The amorphous form of a drug usually exhibits higher solubility, faster dissolution rate, and improved oral bioavailability in comparison to its crystalline forms. However, the amorphous forms are thermodynamically unstable and tend to transform into a more stable crystalline form, thus losing their advantages. In order to investigate and suppress the crystallization, it is vital to closely monitor the drug solids during the preparation, storage, and application processes. A list of advanced techniques—including optical microscopy, surface grating decay, solid-state nuclear magnetic resonance, broadband dielectric spectroscopy—have been applied to characterize the physicochemical properties of amorphous pharmaceutical solids, to provide in-depth understanding on the crystallization mechanism. This review briefly summarizes these characterization techniques and highlights their recent advances, so as to provide an up-to-date reference to the available tools in the development of amorphous drugs.

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Mani, Ariyanan, Subramanian Tamil Selvan, and Kanala Lakshminarasimha Phani. "Solid state structural aspects of electrochemically prepared poly ( p -phenylene) thin films - crystalline order and spherulite morphology." Journal of Solid State Electrochemistry 2, no. 4 (1998): 242–46. http://dx.doi.org/10.1007/s100080050094.

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