Results 21 to 30 of about 341,546 (125)
First-principles investigation of graphene fluoride and graphane [PDF]
Phys. Rev. B 82, 195436 (2010), 2010 Different stoichiometric configurations of graphane and graphene fluoride are investigated within density functional theory. Their structural and electronic properties are compared, and we indicate the similarities and differences among the various configurations. Large differences between graphane and graphene fluoride are found that are caused by the
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Origin of ferroelectricity in the multiferroic barium fluorides BaMF4 [PDF]
, 2006 We present a first principles study of the series of multiferroic barium fluorides with the composition BaMF4, where M is Mn, Fe, Co, or Ni. We discuss trends in the structural, electronic, and magnetic properties, and we show that the ferroelectricity in these systems results from the "freezing in" of a single unstable polar phonon mode.
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Advanced Environmentally Resistant Lithium Fluoride Mirror Coatings for the Next-Generation of Broadband Space Observatories [PDF]
Brian Fleming, Manuel Quijada, et al., "Advanced environmentally
resistant lithium fluoride mirror coatings for the next generation of
broadband space observatories," Appl. Opt. 56, 9941-9950 (2017), 2018 Recent advances in the physical vapor deposition (PVD) of protective fluoride films have raised the far-ultraviolet (FUV: 912-1600 {\AA}) reflectivity of aluminum-based mirrors closer to the theoretical limit. The greatest gains, at more than 20%, have come for lithium fluoride-protected aluminum, which has the shortest wavelength cutoff of any ...
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Origin of temperature dependent conductivity of $α$-polyvinylidene fluoride [PDF]
J. Chem. Phys. 122, 084901 (2005), 2004 The conductivity of $\alpha$-polyvinylidene fluoride ($\alpha$-PVDF) is obtained from dielectric measurements performed in the frequency domain at several temperatures. At temperatures above the glass-transition, the conductivity can be interpreted as an ionic conductivity, which confirms earlier results reported in the literature.
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Luminescence of photochromic centers in calcium fluoride crystals doped with Lu$^{3+}$ ions [PDF]
, 2015 We report data on the luminescence spectra associated with photochromic centers in X-ray irradiated calcium fluoride crystals doped with Lu ions. Irradiation in low energy photochromic centers absorption band excites emission, which can be identify with transitions into photochromic centers.
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Luminescence of cadmium fluoride doped with rare-earth ions [PDF]
, 2013 Absorption, excitation and emission spectra of cadmium fluoride crystals doped with rare-earth ions were investigated. In contrast to alkaline-earth fluorides the absorption spectra due to 4f - 5d transitions of Ce$^{3+}$, Pr$^{3+}$ and Tb$^{3+}$ ions are broadened. No 5d-4f emissions were observed.
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Nuclear quantum effects in water exchange around lithium and fluoride ions [PDF]
, 2015 We employ classical and ring polymer molecular dynamics simulations to study the effect of nuclear quantum fluctuations on the structure and the water exchange dynamics of aqueous solutions of lithium and fluoride ions. While we obtain reasonably good agreement with experimental data for solutions of lithium by augmenting the Coulombic interactions ...
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Electric-field-induced modulation of thermal conductivity in poly(vinylidene fluoride) [PDF]
arXiv, 2020 Phonon engineering focuses on heat transport modulation on atomic-scale. Different from reported methods, it is shown that electric field can also modulate heat transport in ferroelectric polymers, poly(vinylidene fluoride), by both simulation and measurement. Interestingly, thermal conductivities of poly(vinylidene fluoride) array can be enhanced by a
arxiv
Nonpolar optical scattering of positronium in magnesium fluoride [PDF]
, 2004 We report the results of the analysis of the temperature broadening of the momentum distribution of delocalized Positronium (Ps) in Magnesium Fluoride in terms of optical deformation-potential scattering model (long-wavelength optical phonons). The Ps optical deformation-potential coupling constant $D_{o}$ in MgF$_{2}$ has been determined to be $(1.8 ...
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Symmetry Analysis of the Kohn-Sham Band Structure of Bulk Lithium Fluoride [PDF]
arXiv, 2003 Kohn-Sham orbitals of face-centered cubic lithium fluoride are calculated in prototypical local-density approximations to the exchange-correlation functional. The symmetry analysis of these Bloch functions in a LCAO basis on a path Gamma-X-W-K-Gamma-L-W through the Brillouin Zone is compiled into a list of errata to symmetry labels in the LiF ...
arxiv