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The Electrostatic Screening Length in Concentrated Electrolytes Increases with Concentration Open
According to classical electrolyte theories interactions in dilute (low ion density) electrolytes decay exponentially with distance, with the Debye screening length the characteristic length scale. This decay length decreases monotonically…
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Estimation of particle size using the Debye equation and the Scherrer formula for polyphasic TiO<sub>2</sub> powder Open
There are two methods to estimate the particle size from X-ray diffraction data: the Debye equation and the Scherrer formula. The main goal of this study is to describe the methodology of particle size estimation on the base of two these m…
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Rationalizing phonon dispersion for lattice thermal conductivity of solids Open
Lattice thermal conductivity (κL) is one of the most fundamental properties of solids. The acoustic–elastic-wave assumption, proposed by Debye (Debye P. Ann Phys 1912; 344: 789–839), has led to linear phonon dispersion being the most commo…
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Universal Origin of Boson Peak Vibrational Anomalies in Ordered Crystals and in Amorphous Materials Open
The vibrational spectra of solids, both ordered and amorphous, in the low-energy regime, control the thermal and transport properties of materials, from heat capacity to heat conduction, electron-phonon couplings, conventional superconduct…
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Local inversion-symmetry breaking controls the boson peak in glasses and crystals Open
It is well known that amorphous solids display a phonon spectrum where the Debye $\sim \omega^2$ law at low frequency melds into an anomalous excess-mode peak (the boson peak) before entering a quasi-localized regime at higher frequencies …
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Growing timescales and lengthscales characterizing vibrations of amorphous solids Open
Significance Amorphous solids constitute most of solid matter but remain poorly understood. The recent solution of the mean-field hard-sphere glass former provides, however, deep insights into their material properties. In particular, this…
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Propagation of a plasma streamer in catalyst pores Open
Although plasma catalysis is gaining increasing interest for various environmental applications, the underlying mechanisms are still far from understood. For instance, it is not yet clear whether and how plasma streamers can propagate in c…
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A High-Sensitivity Microfluidic Sensor Based on a Substrate Integrated Waveguide Re-Entrant Cavity for Complex Permittivity Measurement of Liquids Open
In this study, a novel non-invasive and contactless microwave sensor using a square substrate integrated waveguide (SIW) re-entrant cavity is proposed for complex permittivity measurement of chemical solutions. The working principle of thi…
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First-principles Debye–Callaway approach to lattice thermal conductivity Open
Lattice thermal conductivity (κ) is one of the most important thermoelectric parameters in determining the energy conversion efficiency of thermoelectric materials. However, thermal conductivity calculations are time-consuming in solving t…
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Dielectric constant, dielectric loss, conductivity, capacitance and model analysis of electronic electroactive polymers Open
In this study, the dielectric constant, dielectric loss, conductivity and capacitance of the electronic electroactive polymer (EEAP) were systematically tested experimentally, and the effects of different frequencies, effective voltages, e…
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Universal Non-Debye Scaling in the Density of States of Amorphous Solids Open
At the jamming transition, amorphous packings are known to display anomalous vibrational modes with a density of states (DOS) that remains constant at low frequency. The scaling of the DOS at higher packing fractions remains, however, uncl…
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Ultrafast electron diffraction from non-equilibrium phonons in femtosecond laser heated Au films Open
We use ultrafast electron diffraction to detect the temporal evolution of non-equilibrium phonons in femtosecond laser-excited ultrathin single-crystalline gold films. From the time-dependence of the Debye-Waller factor, we extract a 4.7 p…
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Electromagnetic spectral properties and Debye screening of a strongly magnetized hot medium Open
We have evaluated the electromagnetic spectral function and its spectral\nproperties by computing the one-loop photon polarization tensor in presence of\nmagnetic field, particularly in a strong field approximation compared to the\nthermal…
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The origin of the Debye relaxation in liquid water and fitting the high frequency excess response Open
Debye relaxation in the microwave/THz region of the dielectric spectra of water is related to propagation of defects.
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Probing Charged Aqueous Interfaces Near Critical Angles: Effect of Varying Coherence Length Open
Angle-resolved vibrational sum frequency generation experiments have been used to study the silica–water interface as a function of ionic strength. Well below the critical angle, the sum frequency intensity increases up to 10–4 M NaCl and …
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Predicted MAX Phase Sc<sub>2</sub>InC: Dynamical Stability, Vibrational and Optical Properties Open
First principles pseudopotential calculations have been performed for the first time to investigate the phonon dispersion, thermodynamic and optical properties including charge density, Fermi surface, Mulliken population analysis, theoreti…
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Dynamics of interacting magnetic nanoparticles: effective behavior from competition between Brownian and Néel relaxation Open
We identify the influence of dipolar and steric interactions on the Brownian and Néel contributions to the magnetization dynamics of magnetic nanoparticles from extensive computer simulations using a combined Brownian dynamics/Monte-Carlo …
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Dielectric Properties of Common Building Materials for Ultrawideband Propagation Studies [Measurements Corner] Open
Signal propagation is affected by the characteristics of the materials in the medium. Therefore, information about material properties is of paramount importance when radio propagation is investigated. In this article, the measured complex…
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Generalized Debye-Peierls/Allen-Feldman model for the lattice thermal conductivity of low-dimensional and disordered materials Open
We present a generalized model to describe the lattice thermal conductivity of low-dimensional (low-D) and disordered systems. The model is a straightforward generalization of the Debye-Peierls and Allen-Feldman schemes to arbitrary dimens…
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Debye length and plasma skin depth: two length scales of interest in the creation and diagnosis of laboratory pair plasmas Open
In traditional electron/ion laboratory plasmas, the system size $L$ is much larger than both the plasma skin depth $l_{s}$ and the Debye length $\unicode[STIX]{x1D706}_{D}$ . In current and planned efforts to create electron/positron plasm…
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Self-Propulsion of Active Colloids via Ion Release: Theory and Experiments Open
We study the self-propulsion of a charged colloidal particle that releases ionic species using theory and experiments. We relax the assumptions of thin Debye length and weak nonequilibrium effects assumed in classical phoretic models. This…
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Dynamic compression of copper to over 450 GPa: A high-pressure standard Open
We obtained an absolute stress-density path for shocklessly compressed copper to over 450 GPa. A magnetic pressure drive is temporally tailored to generate shockless compression waves through over 2.5-mm-thick copper samples. Furthermore, …
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The Polarization of Polycyclic Aromatic Hydrocarbons Curved by Pentagon Incorporation: The Role of the Flexoelectric Dipole Open
Curvature in polyaromatic hydrocarbons (PAHs), due to pentagon inclusion, produces a dipole moment that contributes significantly to self-assembly processes and adsorption at the surface of carbon materials containing curved structures. Th…
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Dipole-dipole correlations and the Debye process in the dielectric response of nonassociating glass forming liquids Open
The nonexponential shape of the α process observed in supercooled liquids is considered as one of the hallmarks of glassy dynamics and has thus been under study for decades, but is still poorly understood. For a polar van der Waals liquid,…
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Nature of the Debye-Process in Monohydroxy Alcohols: 5-Methyl-2-Hexanol Investigated by Depolarized Light Scattering and Dielectric Spectroscopy Open
The slow Debye-like relaxation in the dielectric spectra of monohydroxy alcohols is a matter of long-standing debate. In the present Letter, we probe reorientational dynamics of 5-methyl-2-hexanol with dielectric spectroscopy and depolariz…
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Terahertz dielectric spectroscopy of human brain gliomas and intact tissues ex vivo: double-Debye and double-overdamped-oscillator models of dielectric response Open
Terahertz (THz) technology offers novel opportunities in the intraoperative neurodiagnosis. Recently, the significant progress was achieved in the study of brain gliomas and intact tissues, highlighting a potential for THz technology in th…
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Generation of Frenkel defects above the Debye temperature by proliferation of phonons near the Brillouin zone edge Open
A novel, non-radiative mechanism is reported by which Frenkel pairs of vacancies and interstitials are generated in molar concentrations far above thermal equilibrium. This mechanism is demonstrated in molecular dynamics (MD) simulations o…
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Direct Quantification of Water Surface Charge by Phase-Sensitive Second Harmonic Spectroscopy Open
We developed and verified a phase-sensitive second harmonic generation spectroscopic scheme that allows for direct determination of the absolute surface charge density and surface potential of a water interface without the need for prior i…
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The structural and magnetic properties, non-Debye relaxation and hopping mechanism in Pb<i><sub>x</sub></i>Nd<sub>1−</sub><i><sub>x</sub></i>FeO<sub>3</sub> (where <i>x</i> = 0.1, 0.2 and 0.3) solid solutions Open
Nd1−xPbxFeO3 (x = 0.1–0.3) solid solutions were prepared by aliovalent substitution of Pb2+ at the Nd3+ site using the conventional solid-state reaction route. The structural, magnetic and dielectric properties and hopping mechanism of the…
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A multiple decay-length extension of the Debye–Hückel theory: to achieve high accuracy also for concentrated solutions and explain under-screening in dilute symmetric electrolytes Open
Very accurate pair distributions and thermodynamics of electrolytes from multiple Debye–Hückel-type decay components, which become oscillatory when appropriate.