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Diala Elias Salloum

Full professor
Chemistry - Biochemistry department - Section III - Tripoli
Speciality: Chemistry
Specific Speciality: Chimie du solide

Publications 25 publications
Diane Ansermet, Alexander P. Petrović*, Shikun He, Dmitri Chernyshov, Moritz Hoesch, Diala Salloum, Patrick Gougeon, Michel Potel, Lilia Boeri, Ole Krogh Andersen, and Christos Panagopoulos Reentrant Phase Coherence in Superconducting Nanowire Composites ACS Nano 2016

P. Gougeon, P. Gall and D. Salloum Crystal structure of Sc1.91In1.39Mo15Se19, containing Mo6 and Mo9 clusters Acta Cryst. 2015

Diala Salloum, Patrick Gougeon, Philippe Gall Na4.25Mo15S19: a novel ternary reduced molybdenum sulfide containing Mo6 and Mo9 clusters Acta Crystallographica Section E 2014

Patrick Gougeon, Philippe Gall, Salloum Diala Na2.9KMo12S14: a novel quaternary reduced molybdenum sulfide containing Mo12clusters with a channel structure Acta Crystallographica Section E, 2013

Diala Salloum, Patrick Gougeon, Philippe Gall Na3.88Mo15Se19: a novel ternary reduced molybdenum selenide containing Mo6 and Mo9 clusters Acta Crystallogr Sect E 2013

B. Bergk • A. P. Petrović • Z Wang • Y Wang • D Salloum • Patrick Gougeon • Michel Potel • R. Lortz Superconducting transitions of intrinsic arrays of weakly coupled 1D superconducting chains: The case of the extreme quasi-1D superconductor Tl2Mo6Se6 New Journal of Physics 2011

A. P. Petrovic', R. Lortz, G. Santi, C. Berthod, C. Dubois, M. Decroux, A. Demuer, A. B. Antunes, A. Paré, D. Salloum, P. Gougeon, M. Potel, and Ø. Fischer Multiband Superconductivity in the Chevrel Phases SnMo6S8 and PbMo6S8 Physical Review Letters 2011

Sub-Kelvin scanning tunneling spectroscopy in the Chevrel phases SnMo6S8 and PbMo6S8 reveals two distinct superconducting gaps with 1 ¼ 3 meV, 2  1:0 meV and 1 ¼ 3:1 meV, 2  1:4 meV, respectively. The gap distribution is strongly anisotropic, with 2 predominantly seen when scanning across unit-cell steps on the (001) sample surface. The spectra are well fitted by an anisotropic two-band BCS s-wave gap function. Our spectroscopic data are confirmed by electronic heat capacity measurements, which also provide evidence for a twin-gap scenario.

Patrick Gougeon, Philippe Gall, Salloum Diala, Potel Michel V1.42In1.83Mo15Se19 Acta Crystallographica Section E 2010

A. P. Petrovic', R. Lortz, G. Santi, M. Decroux, H. Monnard, Ø. Fischer, L. Boeri, O. K. Andersen, J. Kortus, D. Salloum, P. Gougeon, and M. Potel Phonon mode spectroscopy, electron-phonon coupling, and the metal-insulator transition in quasi-one-dimensional M2Mo6Se6 Physical Review B 2010

We present electronic-structure calculations, electrical resistivity data, and the first specific-heat measurements in the normal and superconducting states of quasi-one-dimensional M 2 Mo 6 Se 6 (M=Tl,In,Rb) . Rb 2 Mo 6 Se 6 undergoes a metal-insulator transition at ∼170 K : electronic-structure calculations indicate that this is likely to be driven by the formation of a dynamical charge-density wave. However, Tl 2 Mo 6 Se 6 and In 2 Mo 6 Se 6 remain metallic down to low temperature, with superconducting transitions at T c =4.2 K and 2.85 K, respectively. The absence of any metal-insulator transition in these materials is due to a larger in-plane bandwidth, leading to increased interchain hopping which suppresses the density wave instability. Electronic heat-capacity data for the superconducting compounds reveal an exceptionally low density of states D E F =0.055 states eV −1  atom −1 , with BCS fits showing 2Δ/k B T c ≥5 for Tl 2 Mo 6 Se 6 and 3.5 for In 2 Mo 6 Se 6 . Modeling the lattice specific heat with a set of Einstein modes, we obtain the approximate phonon density of states F(ω) . Deconvolving the resistivity for the two superconductors then yields their electron-phonon transport coupling function α 2 tr F(ω) . In Tl 2 Mo 6 Se 6 and In 2 Mo 6 Se 6 , F(ω) is dominated by an optical “guest ion” mode at ∼5 meV and a set of acoustic modes from ∼10 to 30 meV. Rb 2 Mo 6 Se 6 exhibits a similar spectrum; however, the optical phonon has a lower intensity and is shifted to ∼8 meV . Electrons in Tl 2 Mo 6 Se 6 couple strongly to both sets of modes, whereas In 2 Mo 6 Se 6 only displays significant coupling in the 10–18 meV range. Although pairing is clearly not mediated by the guest ion phonon, we believe it has a beneficial effect on superconductivity in Tl 2 Mo 6 Se 6 , given its extraordinarily large coupling strength and higher T c compared to In 2 Mo 6 Se 6 .

A. P. Petrovic, Y. Fasano, R. Lortz, C. Senatore, A. Demuer, A. B. Antunes, A. Pare´, D. Salloum, P. Gougeon, Real-Space Vortex Glass Imaging and the Vortex Phase Diagram of SnMo6S8 Physical Review Letters 2009

Using scanning tunneling microscopy at 400 mK, we have obtained maps of around 100 vortices in SnMo6S8 from 2–9 T. The orientational and positional disorder at 5 and 9 T show that these are the first large-scale images of a vortex glass. At higher temperature a magnetization peak effect is observed, whose upper boundary coincides with a lambda anomaly in the specific heat. Our data favor a kinetic glass description of the vortex melting transition, indicating that vortex topological disorder persists at fields and temperatures far below the peak effect in low-Tc superconductors.

P. Gougeon, D. Salloum and M. Potel Cr1.45Tl1.87Mo15Se19, a monoclinic variant of the hexagonal In3Mo15Se19 type Acta Crystallogr C. 2009

The monoclinic compound Cr(1.45)Tl(1.87)Mo(15)Se(19) (chromium thallium pentadecamolybdenum nonadecaselenide) represents a variant of the hexagonal In(3)Mo(15)Se(19) structure type. Its crystal structure consists of an equal mixture of Mo(6)Se(8)Se(6) and Mo(9)Se(11)Se(6) cluster units. The Mo and Se atoms of the median plane of the Mo(9)Se(11)Se(6) unit, as well as three Cr ions, lie on sites with m symmetry (Wyckoff site 2e). The fourth Cr ion is in a 2b Wyckoff position with 1 site symmetry.

Gougeon, P; Salloum, D; Cuny, J; Le Pollès, L; Le Floch, M; Gautier, R; Potel, M. Synthesis, Electronic and Crystal Structures, and Physical Studies of the Superconductor CsMo12S14, Final Step of the Condensation of the (Mo6L8L6) Unit Inorganic Chemistry 2009

The ternary reduced molybdenum sulphide Cs∼1Mo12S14 has been synthesized by solid-state reaction at 1400 °C for 96 h in sealed molybdenum crucibles. The compound crystallizes in the trigonal space group P3̅1c with the following lattice parameters: a = 9.9793 (2) Å, c = 6.3730 (2) Å, Z = 1. Its crystal structure was determined from single crystal X-ray diffraction data and consists of interconnected Mo6S8iS6a units forming an original three-dimensional framework in which large tunnels are occupied randomly by the Cs+ ions. 133Cs static NMR studies are in favor of a static cesium disorder. Unlike Ba4Mo12S18 where some Mo6S8iS6a units are also connected through Si-i ligands, this connection mode does not lead to significant interactions in the title compound. Single-crystal resistivity measurements show that Cs∼1Mo12S14 presents a metallic behavior with a superconducting transition at 7.7 K as confirmed by magnetic measurements.

Diala Salloum, Patrick Gougeon* and Michel Potel The Chevrel phase HgMo6S8 Acta Crystallographica Section E 2009

The crystal structure of HgMo6S8, mercury(II) hexa­molybdenum octa­sulfide, is based on (Mo6S8)S6 cluster units (An external file that holds a picture, illustration, etc. Object name is e-65-00i34-efi1.jpg symmetry) inter­connected through inter­unit Mo—S bonds. The Hg2+ cations occupy large voids between the different cluster units and are covalently bonded to two S atoms. The Hg atoms and one S atom lie on sites with crystallographic An external file that holds a picture, illustration, etc. Object name is e-65-00i34-efi1.jpg and 3 symmetry, respectively. Refinement of the occupancy factor of the Hg atom led to the composition Hg0.973 (3)Mo6S8.

Bouazza, S.; Salloum, D.; Gautier, R.; Gougeon, P. ; Potel, M. ; Hauchard, D. Cations Insertion in Molybdenum Cluster Compounds: Electronic structure an Electrochemical Study Using Cavity Microelectrode Journal of Cluster Science 2009

Owing to the high lability of cations in the three-dimensional framework of K1+x Mo12S14 (0 ≤ x ≤ 1.6), first-principles calculations and electrochemical methods have been carried out to study the insertion of cations in the empty channels of this compound. The cavity microelectrode that is a suitable electrode for powder material analysis has been used in voltammetric experiments. Results obtained for Li+, Na+, Rb+, K+, Cs+ and NH4 + cations are presented and discussed.

D. Salloum, P. Gougeon and M. Potel In0.87K2Mo15Se19: a quaternary selenide containing Mo6 and Mo9 clusters Acta Crystallographica Section E 2006

The structure of In0.87K2Mo15Se19 (indium dipotassium penta­deca­molybdate nona­deca­selenide), isotypic with In2.9Mo15Se19, is characterized by a mixture of Mo6Sei8Sea6 and Mo9Sei11Sea6 cluster units in the ratio 1:1. Both units are inter­connected through additional Mo—Se bonds. In the title compound, K+ replaces the monovalent In positions as observed in In2.9Mo15Se19. One Mo, one Se and the In atom are situated on mirror planes, and two other Se atoms are situated on threefold axes

D. Salloum, R. Gautier, M. Potel, and P. Gougeon Mo15S20: First Evidence of a New Molybdenum Cluster Type in a Metastable Solid-State Compound Chemistry - A European Journal 2006

The Mo15S20 compound was obtained by thermal decomposition of the metastable binary Mo15S19 in sealed silica tube at temperatures above 500 °C. Its crystal structure was solved and refined from a two-component composite crystal by X-ray diffraction in the hexagonal space group P63/m and consists of an equal mixture of the original Mo9S27 cluster unit and the classical one Mo6S8S6 interconnected through Mo[BOND]S bonds. The Mo core of the Mo9S27 unit is totally new and formed a tricapped trigonal prism. Quantum chemical calculations carried out in order to understand these trends as well as magnetic susceptibility measurements are also reported. The title compound becomes superconducting below 5 K.

D. Salloum, P. Gougeon and M. Potel Ho0.76In1.68Mo15Se19 Acta Crystallographica Section E 2006

The structure of holmium indium molybdenum selenide, Ho0.76In1.68Mo15Se19, isotypic with In2.9Mo15Se19 [Gru¨ ttner, Yvon, Chevrel, Potel, Sergent & Seeber (1979). Acta Cryst. B35, 285–292], is characterized by two cluster units Mo6Sei8 Sea 6 and Mo9Sei 11Sea 6 (where i = inner and a = apical) that are present in a 1:1 ratio. The cluster units are centered atWyckoff positions 2b and 2c and have point-group symmetry 3 and 6, respectively. The clusters are interconnected through additional Mo—Se bonds. In the title compound, Ho3+ cations replace the trivalent indium observed in In2.9Mo15Se19, and a deficiency is observed on the monovalent indium site.

D. Salloum, P. Gougeon and M. Potel Na2.54Cs1.14Mo9S11: a quaternary reduced molybdenum sulfide containing Mo9 clusters. Acta Crystallographica Section E 2006

Sodium caesium nonamolybdenum undecasulfide, Na2.54- Cs1.14Mo9S11, is isostructural with Ag1.91Cs1.16Mo9S11. Its crystal structure consists of Mo9S11S6 cluster units with crystallographic 6 (C3h) symmetry and interconnected through interunit Mo—S bonds. The Mo–S framework delimits channels in which the Cs+ cations are disordered. The Na+ cations are located on the mirror planes around the threefold axis between two consecutive Mo9S11S6 units.

D. Salloum, P. Gougeon and M. Potel Ag1.91Cs1.16Mo9S11: a novel quaternary reduced molybdenum sulfide containing Mo9 clusters. Acta Crystallographica Section E 2005

Ag1.911 (6)Cs1.16 (3)Mo9S11, silver caesium nonamolybdenum undecasulfide, is isostructural with the archetype h-Mo9Se11. Its crystal structure consists of Mo9S11S6 cluster units centered on theWyckhoff site 2d and interconnected through inter-unit Mo—S bonds. The Mo–S framework delimits channels in which the Cs+ cations are disordered. The Ag atoms are located on mirror planes around the threefold axes between two consecutive Mo9S11S6 units.

Diala Salloum , Patrick Gougeon, Michel Potel and Régis Gautier “Chimie Douce” synthesis, crystal and electronic structures of the novel Hg~4.2Mo15X19 (X = S, Se) compounds containing Hg3, Mo6 and Mo9 clusters. Comptes rendus - Chimie 2005

The new compounds Hg ~4.2 Mo 15 X 19 (X=S, Se) were obtained by inserting mercury into the metastable Mo 15 X 19 compounds at low temperature. Their crystal structures, determined from single-crystal X-ray diffraction data, show that the molybdenum–chalcogenide network is maintained through the synthesis. It consists of an equal mixture of Mo 6 X 8 X 6 and Mo 9 X 11 X 6 cluster units interconnected through Mo–X bonds as in the parent compounds. In both compounds, the mercury is present either as Hg 2+ cations or forming linear clusters Hg 3 2+ .

Diala Salloum, Régis Gautier, Michel Potel and Patrick Gougeon Ba4Mo12S18: A Superconductor Containing the Dimeric Unit (Mo6)2S24, the Missing Link between the Mo6S14 and Mo9S17 Units Angewandte chemie, 2005

The three-dimensional Mo–S framework of the solid-state compound Ba4Mo12S18 contains the novel dimeric (Mo6)2S24 unit (picture, middle). This can be regarded as the result of fusing two octahedral Mo6S14 units (left) and as the intermediate step towards formation of the bioctahedral Mo9S17 unit (right). Ba4Mo12S18 was found to be a superconductor with a transition temperature of 7 K.

Diala Salloum, Patrick Gougeon, Thierry Roisnel, Michel Potel Syntheses and crystal structures of the compounds In3.7Mo15S19, In1.6Rb2Mo15S19, In2.2CsMo15S19 and ScTl2Mo15S19 containing Mo6 and Mo9 clusters Journal of Alloys and Compounds 2004

The new compounds In3.7Mo15S19, In1.6Rb2Mo15S19, In2.2CsMo15S19, and ScTl2Mo15S19 have been synthesized by solid-state reaction in sealed molybdenum crucible at about 1250 ◦C. Their crystal structures were solved and refined from X-ray single-crystal data in the hexagonal space group P63/m. Their Mo–S framework consists of an equal mixture of Mo6S8S6 and Mo9S11S6 cluster units interconnected through Mo–S bonds. In In3.7Mo15S19, the In atoms occupy crystallographically different positions depending on their formal oxidation states of +1 or +3. This was confirmed by replacing partially or totally the monovalent indium by another monovalent cation such as the rubidium, cesium or thallium and the trivalent indium by the scandium to get the new In1.6Rb2Mo15S19, In2.2CsMo15S19, and ScTl2Mo15S19 compounds, respectively.

Diala Salloum, Régis Gautier, Patrick Gougeon and Michel Potel Syntheses and structural trends of InxMo15S19 compounds containing Mo6 and Mo9 clusters. Journal of Solid State Chemistry 2004

The InxMo15S19 (x ¼ 0:0; 0.10, 0.20, 0.36, 0.50, 0.70, 1.2 and 2.9) compounds were obtained from oxidation of the solid-state compound In3.7Mo15S19 by iodine in sealed glass tube at temperatures below 300C. Their crystal structures were solved and refined from X-ray single crystal data in the hexagonal space group P63=m: The Mo–S framework of the InxMo15S19 compounds consists of an equal mixture of Mo6S8S6 and Mo9S11S6 cluster units interconnected through Mo–S bonds. The X-ray single-crystal study of the InxMo15S19 (0pxp3:7) compounds has allowed us to follow the evolution of the Mo–Mo distances within the Mo6 and Mo9 clusters as a function of the cationic charge. Quantum chemical calculations carried out in order to understand these trends as well as magnetic susceptibility measurements are also reported. r 2004 Elsevier Inc. All rights reserved.

S. Picard, D. Salloum, P. Gougeon and M. Potel Cs2Mo15S19 : a novel ternary reduced molybdenum sulfide containing Mo6 and Mo9 clusters Acta Crystallographica Section C 2004

The crystal structure of dicaesium pentadecamolybdenum nonadecasul®de, Cs2Mo15S19, consists of a mixture of Mo6S8S6 and Mo9S11S6 cluster units in a 1:1 ratio. Both units are interconnected via inter-unit MoÐS bonds. The Cs+ cations occupy large voids between the different cluster units. The Cs and two inner S atoms lie on sites with 3 symmetry (Wyckoff site 12c) and the Mo and S atoms of the median plane of the Mo9S11S6 cluster unit on sites with 2 symmetry (Wyckoff site 18e).

S. Picard, D. Salloum, P. Gougeon and M. Potel Cs6Mo27S31: a novel ternary reduced molybdenum sulfide containing Mo9 and Mo18 clusters Acta Crystallographica Section C 2003

The crystal structure of hexacaesium heptacosamolybdenum hentriacontasul®de, Cs6Mo27S31, consists of a mixture of Mo9S11S6 and Mo18S20S6 cluster units in a 1:1 ratio. The units are connected through MoÐS bonds. Cs+ cations occupy large voids between the different cluster units.

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