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Journal articles on the topic 'Debye behaviour'

Author: Grafiati

Published: 4 June 2021

Last updated: 4 February 2022

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1

Hagopian, Sair, and Scott L. Whittenburg. "Deviations from Stokes-Einstein-Debye behaviour in pyridazine." Journal of Molecular Liquids 45, no. 3-4 (1990): 273–82. http://dx.doi.org/10.1016/0167-7322(90)80035-i.

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2

Koenderink, G. H., and A. P. Philipse. "On Stokes-Einstein and Debye behaviour in colloidal fluids." Le Journal de Physique IV 10, PR7 (2000): Pr7–295—Pr7–298. http://dx.doi.org/10.1051/jp4:2000759.

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3

Tripathy, Chinmayee, Devraj Singh, and Rita Paikaray. "Behaviour of elastic and ultrasonic properties of curium monopnictides." Canadian Journal of Physics 96, no. 5 (2018): 513–18. http://dx.doi.org/10.1139/cjp-2017-0491.

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The temperature-dependent elastic and ultrasonic properties of curium monopnictides CmPn (Pn = N, P, As, Sb) have been explored in the present investigation. The second- and third-order elastic constants have been calculated using Coulomb and Born–Mayer potentials using lattice and hardness parameters. Mechanical parameters, such as Young’s modulus, bulk modulus, shear modulus, tetragonal modulus, anisotropic factor, and Poisson’s ratio, have been computed with second-order elastic constants. These materials fulfilled the requirement of the Born stability criterion. The toughness or fracture r

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4

Costa, B. F. O., J. Cieslak, and S. M. Dubiel. "Anomalous behaviour of the Debye temperature in Fe-rich Fe–Cr alloys." Journal of Alloys and Compounds 492, no. 1-2 (2010): L1—L4. http://dx.doi.org/10.1016/j.jallcom.2009.11.067.

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5

Calderwood, J. H. "On the physical mechanism giving rise to debye behaviour in dielectric media." Journal of Molecular Liquids 49 (September 1991): 119–31. http://dx.doi.org/10.1016/0167-7322(91)80070-k.

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6

Lehnert, B. "Electron plasma oscillations at arbitrary Debye lengths." Journal of Plasma Physics 45, no. 3 (1991): 407–14. http://dx.doi.org/10.1017/s0022377800015804.

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A solution is presented for electron plasma oscillations in a thermalized plasma, at arbitrary ratios of the Debye length AλD and the perturbation wavelength λ. The limit λD≪λ corresponds to the conventional fluid-like theory of small particle excursions, whereas λD≫λ corresponds to the free-streaming limit of strong kinetic phase mixing due to large particle excursions. A strong large-Debye-distance (LDD) effect already appears when λD ≳ λ. The initial amplitude of the fluid-like contribution to the macroscopic density perturbation then becomes small compared with the contribution from the fr

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7

Righetti, Pier Giorgio, Soffia Magnusdottir, Cecilia Gelfi, and Massimiliano Perduca. "Behaviour of inorganic and organic cations in the Debye–Hückel layer of DNA." Journal of Chromatography A 920, no. 1-2 (2001): 309–16. http://dx.doi.org/10.1016/s0021-9673(01)00695-1.

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8

Starzonek, Szymon, Sylwester J. Rzoska, A. Drozd-Rzoska, et al. "Fractional Debye–Stokes–Einstein behaviour in an ultraviscous nanocolloid: glycerol and silver nanoparticles." Soft Matter 11, no. 27 (2015): 5554–62. http://dx.doi.org/10.1039/c5sm00266d.

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9

Feranchuk, I. D., A. A. Minkevich, and A. P. Ulyanenkov. "About non-Gaussian behaviour of the Debye-Waller factor at large scattering vectors." European Physical Journal Applied Physics 24, no. 1 (2003): 21–26. http://dx.doi.org/10.1051/epjap:2003058.

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10

Jyoti and Rakhee Malik. "Behaviour of TSI in Magnetized Plasmas for different Plasma Oscillation to Debye Wavelength ratio." Journal of Physics: Conference Series 823 (April 19, 2017): 012028. http://dx.doi.org/10.1088/1742-6596/823/1/012028.

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11

Jánosfalvi, Zs, J. Hakl, and P. F. de Châtel. "Larmor Precession and Debye Relaxation of Single-Domain Magnetic Nanoparticles." Advances in Condensed Matter Physics 2014 (2014): 1–10. http://dx.doi.org/10.1155/2014/125454.

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The numerous phenomenological equations used in the study of the behaviour of single-domain magnetic nanoparticles are described and some issues clarified by means of qualitative comparison. To enable a quantitativeapplicationof the model based on the Debye (exponential) relaxation and the torque driving the Larmor precession, we present analytical solutions for the steady states in presence of circularly and linearly polarized AC magnetic fields. Using the exact analytical solutions, we can confirm the insight that underlies Rosensweig’s introduction of the “chord” susceptibility for an appro

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12

Lux, A., and M. Stockhausen. "Variation of the Dielectric Relaxation Behaviour of Water by Added Alcohols." Zeitschrift für Naturforschung A 45, no. 8 (1990): 995–98. http://dx.doi.org/10.1515/zna-1990-0809.

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AbstractThe dielectric relaxation of water rich aqueous solutions of ethanol, ehtylene glycol, glycerol, diethylene glycol, 1,2-butanediol, 1,3-butanediol and 1,4-butanediol has been measured at 20 °C. In all cases the fitting of the data by a sum of Debye type spectral components allows for two description modes which can be interpreted as a collective alteration of the water relaxation or, on the other hand, as formation of a microheterogenous solution where "affected" and "unaffected" water becomes discernible

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13

Eid, M. A. M., I. K. Hakim, K. N. Abd-El-Nour, A. L. G. Saad, and M. Stockhausen. "Dielectric Behaviour of Some Pure Normal Alcohols and their Binary Mixtures." Zeitschrift für Naturforschung A 53, no. 10-11 (1998): 809–12. http://dx.doi.org/10.1515/zna-1998-10-1101.

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Abstract The pure 1-alkanols C4 to C12 and seven of their short/long chain binary equimolar mixtures are in-vestigated by static and dynamic dielectric measurements up to 36 GHz at 20, 30 and 40 °C. The apparent dipole moment and the relaxation parameters from a three Debye term analysis of the spectra are discussed. The mixtures are found to behave like a one component alcohol of mean chain length. An odd-even effect is revealed by comparison of mixtures containing C11 with those containing C12 as long chain mixture component.

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14

Badapanda, Tanmaya, Ranjan Harichandan, Sudhasu Nayak, Avinna Mishra, and Sahid Anwar. "Frequency and temperature dependence behaviour of impedance, modulus and conductivity of BaBi4Ti4O15 aurivillius ceramic." Processing and Application of Ceramics 8, no. 3 (2014): 145–53. http://dx.doi.org/10.2298/pac1403145b.

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In this work, we report the dielectric, impedance, modulus and conductivity study of BaBi4Ti4O15 ceramic synthesized by solid state reaction. X-ray diffraction (XRD) pattern showed orthorhombic structure with space group A21am confirming it to be an m=4 member of the Aurivillius oxide. The frequency dependence dielectric study shows that the value of dielectric constant is high at lower frequencies and decreases with increase in frequency. Impedance spectroscopy analyses reveal a non-Debye relaxation phenomenon since relaxation frequency moves towards the positive side with increase in tempera

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15

DEUTSCH, CLAUDE, GUENTER ZWICKNAGEL, and ANTOINE BRET. "Ultra-cold plasmas: a paradigm for strongly coupled and classical electron fluids." Journal of Plasma Physics 75, no. 6 (2009): 799–815. http://dx.doi.org/10.1017/s0022377809007934.

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AbstractUltra-cold plasmas obtained by ionization of atomic Rydberg states are qualified as classical and strongly coupled electron fluids. They are shown to share several common trends with ultra-cold electron flows used for ion-beam cooling. They exhibit specific stopping behaviour to charged particle beams, which may be used for diagnostic purposes. Ultra-cold plasmas are easily strongly magnetized. Then, one expects a strongly anisotropic behaviour of low ion velocity slowing down when the target electron cyclotron radius becomes smaller than the corresponding Debye length.

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16

Demetrius, Lloyd, and J. A. Tuszynski. "Quantum metabolism explains the allometric scaling of metabolic rates." Journal of The Royal Society Interface 7, no. 44 (2009): 507–14. http://dx.doi.org/10.1098/rsif.2009.0310.

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A general model explaining the origin of allometric laws of physiology is proposed based on coupled energy-transducing oscillator networks embedded in a physical d -dimensional space ( d = 1, 2, 3). This approach integrates Mitchell's theory of chemi-osmosis with the Debye model of the thermal properties of solids. We derive a scaling rule that relates the energy generated by redox reactions in cells, the dimensionality of the physical space and the mean cycle time. Two major regimes are found corresponding to classical and quantum behaviour. The classical behaviour leads to allometric isometr

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17

Swaminathan, V., V. P. Panov, S. P. Sreenilayam, Yu P. Panarin, and J. K. Vij. "A modified Langevin-Debye model for investigating the electro-optic behaviour of de Vries smectic liquid crystals." Liquid Crystals 46, no. 8 (2018): 1246–51. http://dx.doi.org/10.1080/02678292.2018.1549280.

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18

Mazuki, Nor Fatihah, Pramod Kumar Singh, and Ahmad Salihin Samsudin. "Study on Electrical Conduction Properties of Plasticized CMC-DTAB Based Solid Biopolymer Electrolytes." Materials Science Forum 1025 (March 2021): 15–19. http://dx.doi.org/10.4028/www.scientific.net/msf.1025.15.

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This work focuses on the electrical properties study of solid biopolymer electrolyte (SBE) based plasticized carboxy methylcellulose (CMC) doped dodecyltrimethyl ammonium bromide (DTAB). Different weight percentage of ethylene carbonate (EC) which acts as plasticizer was incorporated into SBE system and were successfully prepared via solution casting technique. The conduction properties of SBE was investigated by using electrical impedance spectroscopy (EIS). The incorporation of 10 wt.% EC was found to achieve the highest ionic conductivity with 1.00 10-3 S cm-1 at room temperature. All SBE s

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19

Świątek-Tran, B., H. A. Kołodziej (deceased), A. Vogt, and V. H. Tran. "Dielectric properties of Co(CO3)(H2O)2(C3H4N2)2 and [Co(C3H3N2)2]n." RSC Advances 5, no. 13 (2015): 9539–45. http://dx.doi.org/10.1039/c4ra13950j.

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Dielectric relaxation phenomenon with non-Debye dynamics in Co(CO<sub>3</sub>)(H<sub>2</sub>O)<sub>2</sub>(C<sub>3</sub>H<sub>4</sub>N<sub>2</sub>)<sub>2</sub> and [Co(C<sub>3</sub>H<sub>3</sub>N<sub>2</sub>)<sub>2</sub>]<sub>n</sub>, resembling the behaviour of ferroelectric relaxors is presumably connected with the charge carriers.

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20

Koo, Yo-Han, and Young-Dae Jung. "Oscillatory Screening Effects on Elastic Collisions in Dense Electron-Ion Quantum Plasmas." Zeitschrift für Naturforschung A 64, no. 3-4 (2009): 237–41. http://dx.doi.org/10.1515/zna-2009-3-411.

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Abstract The oscillatory screening effects on elastic electron-ion collisions are investigated in dense quantum plasmas. The eikonal method with the modified Debye-Hückel potential is employed to obtain the scattering phase shift and scattering amplitude. In addition, the total elastic collision cross section is obtained by the optical theorem with the forward scattering amplitude in quantum plasmas. It is shown that the modified Debye-Hückel screening in quantum plasmas produces the oscillatory behaviour of the scattering phase shift. In addition, the minimum position of the phase shift is re

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21

Golovko, M. F., and L. A. Protsykevych. "Solutions of Sodium in Liquid Ammonia as Described by a Hard Sphere Charge-Dipole Model in the Neutralizing Background." Zeitschrift für Naturforschung A 46, no. 1-2 (1991): 19–26. http://dx.doi.org/10.1515/zna-1991-1-204.

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AbstractThe analytic solution of the mean spherical approximation obtained by us previously for the ion-dipole system in a neutralizing background is applied to study the structural, thermodynamic and dielectric properties of sodium-ammonia solutions. It is shown that the structure of ammonia is closepacked and changes little with ion concentration. The shape of the ion-ion distribution function changes from solvation behaviour with Debye-like asymptotics at low ion concentration to density ordering in the metalic region.

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22

Deprince, J., S. Fritzsche, T. R. Kallman, P. Palmeri, and P. Quinet. "Influence of plasma environment on K-line emission in highly ionized iron atoms evaluated using a Debye–Hückel model." Canadian Journal of Physics 95, no. 9 (2017): 858–61. http://dx.doi.org/10.1139/cjp-2016-0667.

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The influence of plasma environment on the atomic parameters associated with the K-vacancy states has been investigated theoretically for several iron ions. To do this, a time-averaged Debye–Hückel potential for both the electron–nucleus and electron–electron interactions has been considered in the framework of relativistic multiconfiguration Dirac–Fock computations. More particularly, the plasma screening effects on ionization potentials, K-thresholds, transition energies, and radiative rates have been estimated in the astrophysical context of accretion disks around black holes. In the presen

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23

Isa, M. I. N., and Noor Azniza Mohd Noor. "Ionic Conduction Mechanism of Solid Biodegradable Polymer Electrolytes Based Carboxymethyl Cellulose Doped Ammonium Thiocyanate." Applied Mechanics and Materials 719-720 (January 2015): 114–18. http://dx.doi.org/10.4028/www.scientific.net/amm.719-720.114.

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A conducting solid biodegradable polymer electrolytes based carboxymethyl cellulose (CMC) doped ammonium thiocyanate (NH4SCN) system with concentration in the range 0 – 25 wt.% of NH4SCN have been prepared via solution casting method. The impedance study of CMC-NH4SCN system was measured via Electrical Impedance Spectroscopy (EIS) in the temperature range 303 K – 353 K. The highest ionic conductivity at room temperature (303 K) is 6.48 x 10-5Scm-1for sample containing 25 wt.% NH4SCN. The temperature dependence of CMC-NH4SCN system was found to obey the Arrhenius behaviour where the ionic condu

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24

Saddeek, Yasser B., and N. Z. Elsayed. "Structural and mechanical features of some lanthanum tellurite glasses." Canadian Journal of Physics 93, no. 4 (2015): 460–65. http://dx.doi.org/10.1139/cjp-2014-0044.

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Tellurite-based glasses of the chemical formula xLa2O3-(100 – x) TeO2, (2.5 ≤ x ≤ 12.5 mol%) have been prepared and studied by FTIR spectroscopy and the ultrasonic technique. The FTIR analysis indicated that La2O3 transformed the TeO3 into TeO4 structural units in the range 2.5 ≤ x ≤ 5, while in the range 5 ≤ x ≤ 7.5 mol%; there is a coordination transformation of Te atoms in [TeO4] groups into [Formula: see text] groups associated with the formation of non-bridging oxygens. Beyond x = 7.5 mol%, the structural units [Formula: see text] (tp) were destroyed and transformed into TeO4 structural u

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25

Mahal, Harpreet Singh, Bhanu Partap Singh, and Ravi Kant. "The Effect of Co doping on Structural, Optical and Dielectric Behaviour of TiO2 Nanoparticles." Defence Science Journal 71, no. 03 (2021): 390–94. http://dx.doi.org/10.14429/dsj.71.16720.

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Chemical precipitation method was used to synthesise pure and Co-doped TiO2 nanoparticles. The synthesised nanoparticles were studied for its structural optical and dielectric properties. X-Ray diffraction (XRD) confirmed the anatase phase with the tetragonal structure obtained for both samples. No extra peak was obtained in the pattern indicates that cobalt ions were successfully incorporated. The crystallite size of both samples were determined by using Debye-Scherrer’s method, and it was found that it decreases with the dopant addition. UV vis spectroscopy was performed to study the optical

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26

LOS, J., T. JANSSEN, and F. GÄHLER. "THE PHONON SPECTRUM OF THE OCTAGONAL TILING." International Journal of Modern Physics B 07, no. 06n07 (1993): 1505–25. http://dx.doi.org/10.1142/s0217979293002468.

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A study of the phonon spectrum of the octagonal tiling is presented, by calculating and analysing the properties of the spectrum of perfect and randomized commensurate approximants with unit cells containing up to 8119 vertices. The total density of states, obtained by numerical integration over the Brillouin zone, exhibits much structure, and in the low frequency range of the spectrum there is deviation from the normal linear behaviour in the form of pseudogaps. For randomized approximants these pseudogaps disappear and the density of states is globally smoothened. It turns out that the width

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27

Gusev, Yuri Vladimirovich. "The quasi-low temperature behaviour of specific heat." Royal Society Open Science 6, no. 1 (2019): 171285. http://dx.doi.org/10.1098/rsos.171285.

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A new mathematical approach to condensed matter physics, based on the finite temperature field theory, was recently proposed. The field theory is a scale-free formalism; thus, it denies absolute values of thermodynamic temperature and uses dimensionless thermal variables, which are obtained with the group velocities of sound and the interatomic distance. This formalism was previously applied to the specific heat of condensed matter and predicted its fourth power of temperature behaviour at sufficiently low temperatures, which was tested by experimental data for diamond lattice materials. The r

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28

Subashini, C., R. Ezhil Pavai, and L. Balu. "Effect of Pb2+ Ions on the Mechanical, Structural and Thermal Behaviour of B2O3-CaO Glasses." Asian Journal of Chemistry 32, no. 1 (2019): 101–5. http://dx.doi.org/10.14233/ajchem.2020.22337.

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B2O3-CaO-PbO glasses with different concentrations of PbO (5-20 mol % in four steps) were prepared by melt quench technique. The amorphous nature and homogeneities of the prepared glasses were confirmed by XRD and SEM analyses. Ultrasonic velocities and density were measured at 303 K using pulse-echo technique and Archimedes’ principle respectively. Various parameters, viz., molar volume, longitudinal modulus, shear modulus, bulk modulus, Young’s modulus, Poisson’s ratio, micro-hardness and Debye temperature have been evaluated from the measured data. The results of ultrasonic properties indic

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29

Jiang, Hua-Long, Song-Hao Jia, Da-Wei Zhou, Chun-Ying Pu, Fei-Wu Zhang, and Shuai Zhang. "First-Principles Calculations of the Mechanical and Elastic Properties of 2Hc- and 2Ha-WS2/CrS2 Under Pressure." Zeitschrift für Naturforschung A 71, no. 6 (2016): 517–24. http://dx.doi.org/10.1515/zna-2015-0517.

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AbstractBy utilizing the first-principles method, the pressure-induced effects on phase transition, mechanical stability, and elastic properties of WS2/CrS2 are investigated in the pressure range from 0 to 80 GPa. Transitions from 2Hc to 2Ha for WS2 and CrS2 are found to occur at 17.5 and 25 GPa, respectively. It is found that both 2Ha and 2Hc phases of WS2 and CrS2 meet the mechanical stability criteria up to 80 GPa, suggesting that those structures are mechanically stable. The bulk and shear modulus anisotropy of the two phases of WS2 and CrS2 decrease rapidly under pressure and, finally, tr

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30

Saad, A., U. Becker, M. Stockhausen, and Y. Barakat. "Notiz: Dynamic Dielectric Properties of Some Alkylamino Ethoxylates." Zeitschrift für Naturforschung A 50, no. 11 (1995): 1083–84. http://dx.doi.org/10.1515/zna-1995-1116.

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Abstract Nine ethoxylated (EO) alkyl amines, (CnH2n + 1) N(EO)x; H(EO)y H, with n = 10 to 16 and p = x + y = 7.6 to 14.5, were studied as pure liquids with respect to their dielectric relax ation behaviour over the frequency range 5 MHz to 36 GHz at 20 °C. The broad and structureless dielectric loss spectrum is similar for all samples. It can be described by a main lower frequency spectral component of Havriliak-Negami type plus two minor, higher frequency Debye type components. The relaxation parameters are reported. Dynamic Dielectric Properties of Some Alkylamino Ethoxylates

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31

Vinay, K., K. Shivakumar, Y. T Ravikiran, and M. Revanasiddappa. "Spectroscopic Studies, Thermal Behaviour and Ac Impedance Study of Chemically Synthesized Silver Doped Polyaniline / BaFe12O19 Polymer Composite." International Journal of Engineering & Technology 7, no. 4.5 (2018): 20. http://dx.doi.org/10.14419/ijet.v7i4.5.20001.

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The present work is a study of a.c impedance response and thermal behaviour of IPANI/Ag/BaFe12O19 (PAB) composites synthesized by in-situ oxidative interfacial polymerization using (NH4)2S2O8 as an oxidizing agent at 0-50C. The synthesized polymer compo- sites were examined by FT-IR, TGA-DTA and DSC techniques. The a.c conductivity properties of the composites were investigated in the frequency range varying from 5x101 – 5x106 Hz at room temperature using HIOKI make 3532-50 LCR Hi-tester. FT-IR profiles confirm the formation of ferrite composite. The endothermic regions in the DTA pattern are

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32

Noor, N. A. M., and M. I. N. Isa. "Ionic Conductivity and Dielectric Properties of CMC Doped NH₄SCN Solid Biopolymer Electrolytes." Advanced Materials Research 1107 (June 2015): 230–35. http://dx.doi.org/10.4028/www.scientific.net/amr.1107.230.

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In this work, solid biopolymer electrolytes (SBE) containing carboxymethyl cellulose (CMC) doped with ammonium thiocyanate (NH4SCN) were prepared via solution casting method. The ionic conductivity and dielectric properties of CMC-NH4SCN system were investigated by electrical impedance spectroscopy in the temperature range of 303-353 K. The dc conductivity shows that the highest ionic conductivity of 6.48 x 10-5 Scm-1 at ambient temperature was obtained when 25 wt.% of NH4SCN was incorporated. The temperature dependence of ionic conductivity revealed that CMC-NH4SCN system was discovered to ob

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33

CONROY, D. T., R. V. CRASTER, O. K. MATAR, and D. T. PAPAGEORGIOU. "Dynamics and stability of an annular electrolyte film." Journal of Fluid Mechanics 656 (May 26, 2010): 481–506. http://dx.doi.org/10.1017/s0022112010001254.

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We investigate the evolution of an electrolyte film surrounding a second electrolyte core fluid inside a uniform cylindrical tube and in a core-annular arrangement, when electrostatic and electrokinetic effects are present. The limiting case when the core fluid electrolyte is a perfect conductor is examined. We analyse asymptotically the thin annulus limit to derive a nonlinear evolution equation for the interfacial position, which accounts for electrostatic and electrokinetic effects and is valid for small Debye lengths that scale with the film thickness, that is, charge separation takes plac

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34

Kaiser, AB, AL Christie, and BL Gallagher. "Investigation of the Interaction of Electrons and Lattice Vibrations Using Glassy Metal Thermopower." Australian Journal of Physics 39, no. 6 (1986): 909. http://dx.doi.org/10.1071/ph860909.

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We calculate the electron-phonon enhancement effect in thermopower using several different models for the Eliashberg function a2 F(E) which describes the interaction of electrons and lattice vibrations. The behaviour of a 2 F(E) at low energies determines whether the predicted thermopower enhancement shows a peak at low temperatures, but the enhancement is rather insensitive to the detailed spectral shape of a2 F(E) at higher energies. The calculations are able to give a good account of the thermopowers of several glassy metals measured by Gallagher and Hickey (1985), with slightly better agre

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35

Prado, Pablo J., Robin L. Armstrong, and Brian Powell. "Influence of substitutional impurities on the static and dynamical behaviour of K2OsCl6 in the vicinity of the structural phase transition: A neutron diffraction study." Canadian Journal of Physics 73, no. 9-10 (1995): 626–31. http://dx.doi.org/10.1139/p95-091.

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The effect of IrCl62− and ReCl62− impurity ions substituted for OsCl62− ion in K2OsCl6 is studied using neutron powder diffraction. The introduction of the impurity ions causes measurable changes in the lattice parameters but not in the Os—Cl bond length. The dynamical parameters of the model structure used to fit the data are well described by a Debye model of the lattice vibrations. The structural phase-transition temperature is affected by the addition of the impurity ions. Evidence is provided for suppression, in the presence of the impurities, of the development of precursor dynamical clu

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36

Kamali, R., and M. Eslami. "A numerical investigation of transient electro-osmotic flow in rectangular microchannels: A comparison of different models." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 224, no. 8 (2010): 1655–63. http://dx.doi.org/10.1243/09544062jmes2008.

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Transient electro-osmotic flow in rectangular microchannels is investigated numerically in this article. The complete Poisson—Boltzmann equation along with the time-dependent momentum equation is solved using the finite-difference method. Moreover, linearized equations based on the Debye—Huckle assumption are also solved to compare with the available analytical approximate solutions. The effects of different parameters such as wall zeta potential, non-dimensional electrokinetic width, and channel aspect ratio are also studied. It is shown that the Debye—Huckle approximation is not only valid f

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37

Declémy, A., C. Rullière, and Ph Kottis. "Picosecond solvation of electronically excited solutes in alcoholic solvents: non-debye behaviour of the time-dependent fluorescence shift related to h." Chemical Physics Letters 133, no. 5 (1987): 448–54. http://dx.doi.org/10.1016/0009-2614(87)87100-2.

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38

Arcos, J. C., F. Méndez, E. G. Bautista, and O. Bautista. "Dispersion coefficient in an electro-osmotic flow of a viscoelastic fluid through a microchannel with a slowly varying wall zeta potential." Journal of Fluid Mechanics 839 (January 29, 2018): 348–86. http://dx.doi.org/10.1017/jfm.2018.11.

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The dispersion coefficient of a passive solute in a steady-state pure electro-osmotic flow (EOF) of a viscoelastic liquid, whose rheological behaviour follows the simplified Phan-Thien–Tanner (sPTT) model, along a parallel flat plate microchannel, is studied. The walls of the microchannel are assumed to have modulated and low $\unicode[STIX]{x1D701}$ potentials, which vary slowly in the axial direction in a sinusoidal manner. The flow field required to obtain the dispersion coefficient was solved using the lubrication approximation theory (LAT). The solution of the electric potential is based

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39

Treumann, Rudolf A., and Wolfgang Baumjohann. "The mirror mode: a “superconducting” space plasma analogue." Annales Geophysicae 36, no. 4 (2018): 1015–26. http://dx.doi.org/10.5194/angeo-36-1015-2018.

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Abstract. We examine the physics of the magnetic mirror mode in its final state of saturation, the thermodynamic equilibrium, to demonstrate that the mirror mode is the analogue of a superconducting effect in a classical anisotropic-pressure space plasma. Two different spatial scales are identified which control the behaviour of its evolution. These are the ion inertial scale λim(τ) based on the excess density Nm(τ) generated in the mirror mode, and the Debye scale λD(τ). The Debye length plays the role of the correlation length in superconductivity. Their dependence on the temperature ratio τ

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Das, Rutuparna, and Ram Choudhary. "Structure, dielectric and electrical properties of relaxor lead-free double perovskite: Nd2NiMnO6." Processing and Application of Ceramics 13, no. 1 (2019): 1–11. http://dx.doi.org/10.2298/pac1901001d.

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In this paper, dielectric relaxor, impedance, AC conductivity and electrical modulus of double perovskite Nd2NiMnO6, prepared by a solid state reaction method and sintered at 1250?C, have been reported in the wide temperature (25-150?C) and frequency (1 kHz-1MHz) ranges. From the preliminary X-ray structural analysis, it is found that the structure of the material is monoclinic. In the study of the temperature dependence of the dielectric constant, the relaxor behaviour of the material is observed. Such type of behaviour is explained by a modified Curie-Weiss and a Vogel-Fulcher law. By analys

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Sabine, TM. "Accurate Structure Factor Measurements by Powder Methods." Australian Journal of Physics 41, no. 3 (1988): 413. http://dx.doi.org/10.1071/ph880413.

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Powder diffraction data are normally analysed by Rietveld refinement. In this technique the observed diffraction. pattern is fitted to a calculated pattern by least-squares methods. The accuracy with which structure factors can be determined is dependent on the parameters in the model being an accurate representation of the physical situation. The Rietveld model is derived in the kinematic approximation. Deviations from kinematic behaviour because of extinction, absorption, thermal diffuse scattering, and multiple scattering are then included in the model. As a test of the method the Debye-Wal

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Shukur, M. F., M. F. Z. Kadir, Z. Ahmad, and R. Ithnin. "Dielectric Studies of Proton Conducting Polymer Electrolyte Based on Chitosan/PEO Blend Doped with NH₄NO₃." Advanced Materials Research 488-489 (March 2012): 583–87. http://dx.doi.org/10.4028/www.scientific.net/amr.488-489.583.

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Polymer blend of chitosan and poly(ethylene oxide) (PEO) electrolytes were prepared by employing solution cast method. Ammonium nitrate (NH4NO3) was added to the blend to supply the charge carriers for ionic conduction. The impedance of the electrolytes was measured by electrical impedance spectroscopy (EIS) over the frequency range of 50 Hz to 1 MHz. The permittivity ɛr and electric modulus Mr of the complex were analyzed. Dispersion at low frequencies caused by space charge effect from the electrodes was observed. The modulus plots indicated that the dispersion deviated from the Debye behavi

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MATEJCZYK, B., J. F. PIETSCHMANN, M. T. WOLFRAM, and G. RICHARDSON. "Asymptotic models for transport in large aspect ratio nanopores." European Journal of Applied Mathematics 30, no. 3 (2018): 557–84. http://dx.doi.org/10.1017/s0956792518000293.

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Ion flow in charged nanopores is strongly influenced by the ratio of the Debye length to the pore radius. We investigate the asymptotic behaviour of solutions to the Poisson–Nernst–Planck (PNP) system in narrow pore like geometries and study the influence of the pore geometry and surface charge on ion transport. The physical properties of real pores motivate the investigation of distinguished asymptotic limits, in which either the Debye length and pore radius are comparable or the pore length is very much greater than its radius This results in a quasi-one-dimensional (1D) PNP model, which can

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Horsák, Ivan, and Ivo Sláma. "A lattice model of electrolytes for the whole concentration range." Collection of Czechoslovak Chemical Communications 52, no. 7 (1987): 1672–79. http://dx.doi.org/10.1135/cccc19871672.

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Based on the quasi-lattice concept, a simple model is proposed for calculating the quantities of mixing of strong electrolyte solutions over the whole concentration range from pure solvent to pure salt. This model is analogous to the regular solution model for non-electrolyte systems. Relationships for the activity coefficients of the solvent and salt have been derived, and the behaviour of the model in the limit of infinite dilution is discussed by comparison with the Debye-Huckel theory. The adequacy of equations derived from the proposed model has been tested by fitting published experiment

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Jadżyn, J., C. Legrand, P. Kędziora, B. Żywucki, G. Czechowski, and D. Bauman. "Dielectric Behaviour of 1-(4-Isothiocyanatophenyl)-2-(4-hexyl- bicyclo[2,2,2]octane-1)ethane in Nematic and Isotropic Phases." Zeitschrift für Naturforschung A 51, no. 8 (1996): 933–38. http://dx.doi.org/10.1515/zna-1996-0808.

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Abstract Static and dynamic investigations of the dielectric properties of the liquid crystal 1-(4-isothio-cyanatophenyl)-2-(4-hexyl-bicyclo[2,2,2]octane-1)ethane in the nematic and isotropic phases have been carried out in the frequency region from 1 kHz to 1 GHz. Two relaxation processes, described by the Debye functions, have been observed not only in the isotropic but also in the nematic phase, when the measurements of the electric permittivity vs. frequency have been made parallel to the orientation axis of liquid crystal. These processes are related to the rotation of the permanent dipol

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Osman, Rozana A. M., and Mohd Sobri Idris. "Electrical Properties of Fresnoite Ba₂TiSi₂O₈ Using Impedance Spectroscopy." Advanced Materials Research 795 (September 2013): 640–43. http://dx.doi.org/10.4028/www.scientific.net/amr.795.640.

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Fresnoite with composition Ba2TiSi2O8 (B2TS2) was first found in 1965, adopting a non-centrosymmetric structure. It also reported to crystallize in a tetragonal unit cell with a=8.52Å and c=5.210Å leading to some possible application as hydrophone, transducer and second harmonic generation and low temperature co-fired ceramics (LTCC). B2TS2 were synthesized by conventional solid state reaction. Phase pure B2TS2 was obtained after heating the pellets at a final sintering temperature of 1230 °C in air at 92 h. Study found that Fresnoite B2TS2 is a type of materials which are not ferroelectric

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Stark, Andreas, Emanuel Schwaighofer, Svea Mayer та ін. "In Situ High-Energy XRD Study of the Hot-Deformation Behavior of a Novel γ-TiAl Alloy". MRS Proceedings 1516 (2012): 71–76. http://dx.doi.org/10.1557/opl.2012.1577.

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ABSTRACTThe development of suitable hot-forming processes, e.g. forging, is an important step towards the serial production of TiAl parts. Several microstructure parameters change during hot-forming. However, the underlying mechanisms can normally only be inferred from post process metallographic studies.We used a deformation dilatometer modified for working in the HZG synchrotron beamlines at DESY for hot-deformation experiments. This setup enables the in situ monitoring of the interaction and evolution of microstructure parameters during processing. We observed the evolution of phase fractio

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Patel, Satyanarayan, and Harekrishna Yadav. "Electrical conduction properties of the BZT–BST ceramics." Journal of Advanced Dielectrics 10, no. 06 (2020): 2050026. http://dx.doi.org/10.1142/s2010135x20500265.

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0.5Ba([Formula: see text][Formula: see text]O3-0.5([Formula: see text][Formula: see text]TiO3 (BZT–BST) has been explored in recent times for potential applications in energy harvesting, electrocaloric and energy storage. To this end, energy harvesting/conversion and storage applications require an understanding of the conduction and loss mechanisms. The conduction mechanism in BZT–BST ceramics is studied using impedance spectroscopy (IS) at 0.1 Hz−3 MHz and 100−600[Formula: see text]C. Impedance study reveals the presence of two types of relaxation processes due to grain and grain boundary co

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Madan, M. P. "Dielectric relaxation of nitromethane, some nitriles, and their mixtures in dilute solutions." Canadian Journal of Physics 65, no. 12 (1987): 1573–76. http://dx.doi.org/10.1139/p87-260.

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The dielectric absorption of nitromethane, benzonitrile, and acetonitrile and their binary mixtures has been studied in the microwave region over a range of temperatures in dilute benzene solutions. The data on static and optical permittivities at 20 °C have also been obtained, from measurements at 100 kHz and from measuring the refractive index for sodium-D lines, for a few cases. These data have been used to determine the relaxation times and the thermodynamic parameters for the activated state. The results obtained have been discussed in terms of the molecular motion of the systems. A new e

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Dachwitz, E. "Studies of Polymer Solvation by Dielectric Relaxation Spectroscopy III: Polyvinyl Pyrrolidone in N-Methyl-2-Pyrrolidone, Ethanediol, Methanol, and Water." Zeitschrift für Naturforschung A 45, no. 2 (1990): 126–34. http://dx.doi.org/10.1515/zna-1990-0207.

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AbstractThe permittivity of the title solutions has been measured at frequencies between some MHz and 72 GHz at 20 °C. Polyvinyl pyrrolidone of relative molar mass ranging from 1200 to 360 000 has been used. Referring to the concentration of monomeric repeat units (x = 0.65 maximum) there is no significant chain length effect. The permittivity data are described in terms of discrete Debye type spectral components. Special attention is paid to the contributions ascribable to the solvents, which are discussed with respect to their solvation behaviour. This can be described by a three state solve

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