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Publications associées (136)

The commensurate composite sigma-structure of beta-tantalum

Gervais Chapuis, Alla Arakcheeva, Philip Pattison

The single-crystal investigation of the self-hosting sigma-structure of beta-tantalum (beta-Ta) at 120 K (low-temperature, LT, structure) and at 293 K (RT-I before cooling and RT-II after cooling and rewarming; RT represents room temperature) shows that th ...

2003

A new natural, super-hard, transparent polymorph of carbon from the Popigai impact crater, Russia

Philippe Gillet

A natural shockwave event led to the formation of a new crystalline polymorph of carbon in gneisses from the Popigai crater, Russia. The new species occupies the interior of a multiphase assemblage and is entirely enveloped by lonsdaleite and graphite. Pol ...

2003

On co-amenability for groups and von Neumann algebras

Nicolas Monod

We first show that co-amenability does not pass to subgroups, answering a question asked by Eymard in 1972. We then address co-amenability for von Neumann algebras, describing notably how it relates to the former. ...

2003

Monodomain versus polydomain piezoelectric response of 0.67Pb(Mg1/3Nb2/3)O-3-0.33PbTiO(3) single crystals along nonpolar directions

Nava Setter, Dragan Damjanovic, Matthew Davis, Marko Budimir

Using recently published experimental data we calculated the piezoelectric response of rhombohedral 0.67Pb(Mg1/3Nb2/3)O-3-0.33PbTiO(3) monodomain single crystals along arbitrary directions. The calculations indicate that the value of the longitudinal piezo ...

2003

Diaquadihydroxohexakis(tri-tert-butoxysilanethiolato)octalithium(I)-toluene (1/2)

The title compd. was obtained by reaction of (tert-BuO)3SiSH with metallic Li. Crystals are monoclinic, space group P21/n, with a 13.088(3), b 27.188(5), c 17.525(4) .ANG., b 102.25(3) Deg; Z = 2, dc = 1.083; R = 0.036, Rw(F2) = 0.105 for 11,732 reflection ...

2002

The self-hosting structure of beta-Ta

Gervais Chapuis, Alla Arakcheeva

Using electrodeposition from a bath of molten fluorides, single crystals of tetragonal beta-tantalum have been obtained for the first time at normal pressure. The unit-cell parameters are a = 10.211 (3), c = 5.3064 (10) Angstrom, space group P (4) over bar ...

2002

Reactions directed towards Sb(OTeF5)-6 salts of new tellurium cations: formation, FT-Raman spectrum and X-ray crystal structure of [Cl3Te-F-TeCl3][Sb(OTeF5)6] containing the m-fluoro-bis[trichloro-tellurium(IV)] cation

Isabelle Dionne

The metathesis reaction of TeBr4 and AgSb(OTeF5)6 in SO2 led to [TeBr3][Sb(OTeF5)6] and AgBr, and that of 2AgSb(OTeF5)6 with 7Te:TeBr4 led to [Te4][Sb(OTeF5)6]2. The crystal structure of [Cl3Te-F-TeCl3][Sb(OTeF5)6] is reported, prepd. from Te, TeBr4 and Ag ...

2002

The LT phase of Cs3Bi2I9

Gervais Chapuis, Alla Arakcheeva

The low temperature (LT) modification of Cs3Bi2I9 has been refined to R(F) = 0.055 on the basis of X-ray diffraction measurements at T = 130 K from a twin crystal with six fractions connected by 3-fold axis and m-planes symmetry operations. Data were colle ...

2001

The First Simple, Donor-Free Salt of the Sb(OTeF5)6- Anion: Synthesis, Structure, Characterization, and Thermochemistry of Cs[Sb(OTeF5)6]

Cs[Sb(OTeF5)6] was prepd. and its crystal structure detd. in space group P42/n, Rw = 0.051. [on SciFinder (R)] ...

2001

A novel perovskite-like Ta-bronze KTa1+zO3: preparation, stoichiometry, conductivity and crystal structure studies

Gervais Chapuis, Alla Arakcheeva

A new cubic Ta-bronze (1) KTa1+z+(5-delta)O3 [z similar or equal to 0.107 (3)] was obtained on a cathode by molten salt electrolysis of the system K2TaOF5-K3TaO2F4-(KF + NaF + LiF)(cutectic). Black, metallic cubic crystals of (1) are formed together with t ...

2001

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