Magnetophotorefractive effect in Bi12TiO20

Петров, М. П.; Petrov, V.M.; Karavaev, P. M.

doi:10.1134/1.1130204

Cited by 9 publications

(11 citation statements)

References 6 publications

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“…This model reproduces very well many experimental results, starting with those by Arifov et al 14 and Petrov 15 for argon ions. For application of this model to molecular ions, all the contributions due to the projectile constituents must be taken into account.…”

Section: Theories Of Electron Emission Under Ion Impactsupporting

confidence: 70%

“…The electron emission processes are not simple, and the experimental results show both linear and non-linear relationships of the electron emission yield as a function of the velocity of the projectiles. [11][12][13] The dependence of the electron yield on the mass and the number of atoms in the projectiles remains an open question at low velocity, as well as the existence of a threshold velocity (as suggested by the experimental results obtained with atomic projectiles 14,15 and clusters 16 ). Furthermore, a strong practical interest arises in the study of electron emission because of its role in the detection of heavy molecular ions in mass spectrometry.…”

mentioning

confidence: 96%

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Secondary Electron Emission Yields from a CsI Surface Under Impacts of Large Molecules at Low Velocities (5 × 103−7 × 104 ms−1)

Brunelle

Chaurand

Della‐Negra

et al. 1997

Rapid Commun. Mass Spectrom.

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The yields of electron emission from a CsI surface bombarded with very heavy molecular ions have been measured by coincidence counting in time-of-flight mass spectrometry. These ions were produced by the matrix-assisted laser desorption/ionization technique. The masses ranged from 700 to 66 000 Da with velocities V between 5 × 10 3 and 7 × 10 4 ms For a few years, the interaction of heavy clusters and molecules with solids has been the subject of welldeveloped research. In these investigations the projectiles have had energies from a few eV/atom to a few MeV/atom. Over this large domain of velocities, the projectiles deposit a large amount of energy near the surface of the target. For masses in the range of 10 000 u to 100 000 u, energies of 10 keV to 2 MeV are deposited in a small volume. The transfer of very high densities of transitory and out-of-equilibrium energy into the solid leads to important modifications of the material and/or to the formation of craters independent of the energy range, the mass of the projectiles and the nature of the bombarded surface.1-5 Crater formation is accompanied by a very high sputter yield, as was first observed by Andersen and Bay. 6 The other de-excitation channels, such as electron and ion emission, have also been studied. The ion emission yield exhibits a non-linear increase as a function of the number of constituents or the mass of the projectile over the velocity range studied.7-10 For electron emission, results are scarce. Fundamentally, the electron emission induced by ions is connected to the ion/electron interaction in the medium. The electron emission processes are not simple, and the experimental results show both linear and non-linear relationships of the electron emission yield as a function of the velocity of the projectiles. 11-13

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Section: Theories Of Electron Emission Under Ion Impactsupporting

confidence: 70%

mentioning

confidence: 96%

Secondary Electron Emission Yields from a CsI Surface Under Impacts of Large Molecules at Low Velocities (5 × 103−7 × 104 ms−1)

Brunelle

Chaurand

Della‐Negra

et al. 1997

Rapid Commun. Mass Spectrom.

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“…The higher coordination numbers in rock salt and CsCl structures leads to longer bonds and thus lower κ L . References were used to obtain κ L , and average bond lengths are from the Inorganic Crystal Structure Database (ICSD).…”

Section: Chemical Bonding and Phonon Transportmentioning

confidence: 99%

Thinking Like a Chemist: Intuition in Thermoelectric Materials

Zevalkink²,

et al. 2016

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The coupled transport properties required to create an efficient thermoelectric material necessitates a thorough understanding of the relationship between the chemistry and physics in a solid. We approach thermoelectric material design using the chemical intuition provided by molecular orbital diagrams, tight binding theory, and a classic understanding of bond strength. Concepts such as electronegativity, band width, orbital overlap, bond energy, and bond length are used to explain trends in electronic properties such as the magnitude and temperature dependence of band gap, carrier effective mass, and band degeneracy and convergence. The lattice thermal conductivity is discussed in relation to the crystal structure and bond strength, with emphasis on the importance of bond length. We provide an overview of how symmetry and bonding strength affect electron and phonon transport in solids, and how altering these properties may be used in strategies to improve thermoelectric performance.

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“…The large extension of the chalcogen orbitals is partially due to the anisotropic Cu-Ch bond geometry of a tetrahedron. This situation reminds us of the concept of a lone-pair electron [76][77][78] , which extends into the void space partially by the anisotropic environment. While a crucial role of lone-pair electrons on structural instability in realizing low thermal conductivity has been pointed out for several (thermoelectric) materials [76][77][78] , it is in- teresting that the extended electronic states (but not the lone-pair electrons) can also enhance the power factor by altering the electronic band structure.…”

Section: Discussionmentioning

confidence: 66%

Thermoelectric performance of materials with CuCh4 ( Ch= S, Se) tetrahedra: Similarities and differences among their low-dimensional electronic structure from first principles

Ochi

Mori

Kato

et al. 2018

Phys. Rev. Materials

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In this study, we perform a comparative theoretical study on the thermoelectric performance of materials with CuCh4 (Ch = S, Se) tetrahedra, including famous thermoelectric materials BiCuSeO and tetrahedrite Cu12Sb4S13, by means of first-principles calculations. By comparing these electronic band structures, we find that many of these materials possess a Cu-t2g band structure consisting of quasi-one-dimensional band dispersions and the isotropic (two-dimensional for layered compounds) band dispersion near the valence-band edge. Therefore, the key factors for the thermoelectric performance are the anisotropy of the former band dispersion and the degeneracy of these two kinds of band dispersions. We also find that a large extension of the chalcogen orbitals often improves their thermoelectric performance by improving these two factors or by going beyond such a basic band structure through a large alternation of its shape. Such a large extension of the chalcogen orbitals might partially originate from the anisotropic Cu-Ch bond geometry of a tetrahedron. Our study reveals interesting similarities and differences of materials with CuCh4, which provides important knowledge for a future search of high-performance thermoelectric materials.

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Magnetophotorefractive effect in Bi12TiO20

Cited by 9 publications

References 6 publications

Secondary Electron Emission Yields from a CsI Surface Under Impacts of Large Molecules at Low Velocities (5 × 103−7 × 104 ms−1)

Secondary Electron Emission Yields from a CsI Surface Under Impacts of Large Molecules at Low Velocities (5 × 103−7 × 104 ms−1)

Thinking Like a Chemist: Intuition in Thermoelectric Materials

Thermoelectric performance of materials with CuCh4 ( Ch= S, Se) tetrahedra: Similarities and differences among their low-dimensional electronic structure from first principles

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