17 Result(s)

Chapter and Conference Paper

Characterization of a (021) twin in coesite using LACBED and precession electron diffraction

Coesite is a high-pressure polymorph of silica stable in the pressure range 2.5–9 GPa, which corresponds to a minimum depth in Earth of ca. 90 km. Given the ubiquity of silica at the surface of the Earth, coes...

P. Cordier, D. Jacob, H. -P. Schertl in EMC 2008 14th European Microscopy Congress… (2008)

Chapter and Conference Paper

Precession Electron Diffraction for the characterization of twinning in pseudo-symmetrical crystals: case of coesite

Recent developments in electron diffraction call for a reappraisal of the possibilities offered by spot patterns. Among them is the Vincent-Midgley Precession Electron Diffraction (PED) technique [1], which re...

D. Jacob, P. Cordier, J. P. Morniroli… in EMC 2008 14th European Microscopy Congress… (2008)

Article

Modified vaccinia virus Ankara as a vector for suicide gene therapy

Modified vaccinia virus Ankara (MVA) has been used successfully to express various antigens for the development of vaccines. Here we show that MVA can also be used as an efficient vector for the transfer of su...

P Erbs, A Findeli, J Kintz, P Cordier, C Hoffmann, M Geist… in Cancer Gene Therapy (2008)

Article

TEM characterization of dislocations and slip systems in stishovite deformed at 14 GPa, 1,300°C in the multianvil apparatus

Transmission electron microscopy (TEM) has been used to investigate deformation microstructures of synthetic stishovite specimens deformed at 14 GPa, 1,300°C. Geometrical characteristics of numerous dislocatio...

M. Texier, P. Cordier in Physics and Chemistry of Minerals (2006)

Article

Pressure sensitivity of olivine slip systems: first-principle calculations of generalised stacking faults

We have used a first-principle approach based on the calculation of generalised stacking faults (GSF) to study the influence of pressure on the mechanical properties of forsterite. Six cases corresponding to [...

J. Durinck, A. Legris, P. Cordier in Physics and Chemistry of Minerals (2005)

Article

Plastic deformation of wadsleyite: II. High-pressure deformation in shear

 We have studied the dislocation microstructures that develop in (Mg_0.9Fe_0.1)₂SiO₄ wadsleyite deformed by simple shear at high pressure. The experiments were performed in a multianvil apparatus with the shear ass...

E. Thurel, P. Cordier, D. Frost, S.-I. Karato in Physics and Chemistry of Minerals (2003)

Article

Plastic deformation of wadsleyite: III. Interpretation of dislocations and slip systems

 Linear anisotropic elasticity has been applied to interpret the dislocation stability and ease of slip in wadsleyite. It is shown that wadsleyite is very isotropic from the elastic point of view. The influenc...

E. Thurel, J. Douin, P. Cordier in Physics and Chemistry of Minerals (2003)

Article

Plastic deformation of wadsleyite: I. High-pressure deformation in compression

 We have studied the plastic deformation of Mg₂SiO₄ wadsleyite polycrystals. Wadsleyite was synthesized from a forsterite powder in a multianvil apparatus. It was then recovered and placed in a second multianvil ...

E. Thurel, P. Cordier in Physics and Chemistry of Minerals (2003)

Article

High temperature creep in a 2-3-4 garnet: Ca3Ga2Ge3O12

High temperature plastic deformation in a single crystal of a 2-3-4 garnet, Ca₃Ga₂Ge₃O₁₂, was investigated. A Czochralski-grown single crystal of Ca₃Ga₂Ge₃O₁₂ was deformed in compression in air along 〈100〉 or 〈11...

V. Voegelé, B. Liu, P. Cordier, Z. Wang, H. Takei, P. Pan… in Journal of Materials Science (1999)

Article

Large angle convergent beam electron diffraction determinations of dislocation Burgers vectors in synthetic stishovite

Polycrystalline stishovite, synthesized in a multi-anvil apparatus at 15 GPa and 1200°C, contains numerous dislocations. The microstructures of the recovered material have been investigated using Transmission ...

P. Cordier, T. G. Sharp in Physics and Chemistry of Minerals (1998)

Article

Microstructural investigation of quartz submitted to ultra-short shock loading

A high-energy pulsed laser was used to induce very short (2 ns) pressure pulses in quartz single crystals. The microstructure of recovered specimens was characterized by optical microscopy, scanning electron m...

P. Cordier, J. C. Doukhan, A. Migault, J. P. Romain in Journal of Materials Science (1995)

Article

Microstructures of AIPO₄ subjected to high shock pressures

Berlinite single crystal specimens were shocked to peak pressures 12 and 24 GPa. Specimens were placed in an Al capsule to minimize shock-wave reflections at interfaces between specimen and capsule. Shock pres...

P. Cordier, A. J. Gratz, J. C. Doukhan, W. J. Nellis in Physics and Chemistry of Minerals (1994)

Chapter

Deformations in Minerals

Minerals submitted to tectonic stresses may deform plastically, i.e., continuously at the lattice scale. Various mechanisms of plastic deformation may be involved, depending on several parameters, e.g., temper...

C. Willaime, M. Gandais, G. E. Lloyd, C. C. Ferguson, S. Amelinckx… in Advanced Mineralogy (1994)

Article

Structural transformations of quartz and berlinite AlPO₄ at high pressure and room temperature: a transmission electron microscopy study

Single crystals of α-quartz and α-berlinite AlPO₄ have been compressed at high pressure and room temperature in a diamond anvil cell (DAC). The pressure-induced microstructures have been studied on recovered spec...

P. Cordier, J. C. Doukhan, J. Peyronneau in Physics and Chemistry of Minerals (1993)

Article

Shock metamorphism of quartz with initial temperatures −170 to + 1000° C

Shock experiments on quartz single crystals with initial temperatures −170 to +1000°C showed that ambient temperature does not affect the type of defects formed but can lower the pressure of complete amorphiza...

A. J. Gratz, W. J. Nellis, J. M. Christie, W. Brocious… in Physics and Chemistry of Minerals (1992)

Article

Conduite thérapeutique actuelle devant une ingestion de produit caustique

F. Vicari, J. -M. Friot, P. Boissel, H. Lambert, P. Cordier in Acta Endoscopica (1977)