Search Results - "Hehlen, B."

A century of structural and vibrational spectroscopy in vitreous silica: A short review by Hehlen, B.

“…This article reports on more than a century of elastic and inelastic spectroscopies in vitreous silica, the prototypical glass former. The discovery of…”
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Percolation transitions in compressed SiO2 glasses by Hasmy, A., Ispas, S., Hehlen, B.

“…Amorphous–amorphous transformations under pressure are generally explained by changes in the local structure from low- to higher-fold coordinated polyhedra 1 –…”
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Raman Response of Network Modifier Cations in Alumino-Silicate Glasses by Hehlen, B, Neuville, D. R

“…Raman scattering is performed in three sets of aluminosilicate glasses with light cations and concentrations varying from peralcaline to peraluminate domain…”
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Direct evidence of weakly dispersed and strongly anharmonic optical phonons in hybrid perovskites by Ferreira, A. C., Paofai, S., Létoublon, A., Ollivier, J., Raymond, S., Hehlen, B., Rufflé, B., Cordier, S., Katan, C., Even, J., Bourges, P.

“…Hybrid organolead perovskites (HOP) have started to establish themselves in the field of photovoltaics, mainly due to their great optoelectronic properties and…”
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Relaxor Ferroelectrics: Back to the Single-Soft-Mode Picture by Hehlen, B, Al-Sabbagh, M, Al-Zein, A, Hlinka, J

“…The fluctuations of electric polarization in a disordered ferroelectric substance, relaxor crystal PbMg_{1/3}Nb_{2/3}O_{3} (PMN), were studied using a…”
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The vibrations of vitreous silica observed in hyper-Raman scattering by Hehlen, B., Simon, G.

“…Hyper‐Raman scattering (HRS) is performed in v‐SiO2, and the results are compared to RS and infrared absorption data. Mode analyses are tested based on two…”
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Hyper-Raman and Raman scattering from the polar modes of PbMg1/3Nb2/3O3 by Hehlen, B, Amouri, A, Al-Zein, A, Khemakhem, H

“…Microhyper-Raman spectroscopy of PbMg(1/3)Nb(2/3)O(3) (PMN) single crystal is performed at room temperature. The use of an optical microscope working in…”
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Physical properties of new, lead free (Na0.5Bi0.5)(1−x)BaxTi(1−x)(Fe0.5Nb0.5)xO3 ceramics by Amouri, A., Rouquette, J., Hehlen, B., Sauvajol, J.L., Khemakhem, H.

“…This study reports on the synthesis of polycrystalline samples of (Na0.5Bi0.5)(1−x)BaxTi(1−x)(Fe0.5Nb0.5)xO3 with x=0, 0.025, 0.05, 0.075, and 0.1, using the…”
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GaAsO4: A Bifunctional Material for Piezoelectricity and Second Harmonic Generation by Hermet, P, Souleiman, M, Clavier, D, Hehlen, B, Levelut, C, Sans, P, Haines, J, Cambon, O

“…Gallium arsenate (GaAsO4) has the highest piezoelectric properties among α-quartz-type materials. We describe first-principles calculations of the linear and…”
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Hyper-raman scattering observation of the boson peak in vitreous silica by Hehlen, B, Courtens, E, Vacher, R, Yamanaka, A, Kataoka, M, Inoue, K

“…Hyper-Raman spectroscopy is used to investigate low frequency vibrations of various silica glasses. A strong boson peak is observed. The corresponding modes…”
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Hyper-Raman scattering from vitreous boron oxide: coherent enhancement of the boson peak by Simon, G, Hehlen, B, Courtens, E, Longueteau, E, Vacher, R

“…Hyper-Raman scattering spectra of vitreous B(2)O(3) are compared to Raman scattering ones. Particular attention is given to the low-frequency boson peak which…”
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Role of Zinc and Niobium in the Giant Piezoelectric Response of PbZn1/3Nb2/3O3 by Al-Zein, A, Dammak, H, Papet, Ph, Mathon, O, Hehlen, B, Levelut, C, Haines, J, Rouquette, J

“…Relaxor ferroelectric perovskites are highly polarizable and can exhibit giant coupling between elastic strain and an applied electric field. Here, we report…”
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The vibrational modes of glasses by Courtens, E., Foret, M., Hehlen, B., Vacher, R.

“…Our recent experimental observations on the harmonic vibrational modes of glasses are presented. Emphasis is placed on normal and densified silica. These…”
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Nature of the Boson peak of silica glasses from hyper-Raman scattering by Hehlen, B., Courtens, E., Yamanaka, A., Inoue, K.

“…Hyper-Raman scattering from the Boson peak has been performed in vitreous silica and in a silica-based lead glass. A comparison with Raman scattering and…”
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Femtosecond spectroscopy of defect modes in silica glasses by Guillon, C., Burgin, J., Langot, P., Vallée, F., Hehlen, B.

“…The D 1 and D 2 defect modes are investigated in the time domain in normal and densified silica using a high sensitivity femtosecond pump-probe technique with…”
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Low energy phonon spectrum and its parameterization in pure KTaO3 below 80 K by Farhi, E., Tagantsev, A.K., Currat, R., Hehlen, B., Courtens, E., Boatner, L.A.

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Neutron Brillouin and Umklapp Scattering from Glassy Selenium by Foret, M., Hehlen, B., Taillades, G., Courtens, E., Vacher, R., Casalta, H., Dorner, B.

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Observation of a sample-dependent 37 K anomaly on the lattice parameters of strontium titanate by Arzel, L, Hehlen, B, Dénoyer, F, Currat, R, Liss, K.-D, Courtens, E

“…The lattice parameters of tetragonal strontium titanate are determined to about 1 part in 106 with penetrating X-rays. While no peculiarity is detected in a…”
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Percolation transitions in compressed SiO 2 glasses by Hasmy, A, Ispas, S, Hehlen, B

“…Amorphous-amorphous transformations under pressure are generally explained by changes in the local structure from low- to higher-fold coordinated polyhedra …”
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Phase formation and dielectric study of Bi doped (Ba0.8Sr0.2)Ti0.95(Zn1/3Nb2/3)0.05O3 ceramic by Dhifallah, N., Hehlen, B., Dammak, M., Khemakhem, H.

“…The solid solutions of (Ba0.8Sr0.2)1-1.5xBixTi0.95(Zn1/3Nb2/3)0.05O3 (Bix-BSTZN) (with x = 0, 0.05 and 0.1) ceramics were prepared by the solid-state reaction…”
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