Concept

Olivine

Publications associées (88)

Study of cementitious materials using transmission electron microscopy

An important mode of hydration of Ordinary Portland cement (OPC) is via the formation of a shell of hydration products around cement grains. It has been shown so far that shells form not only in OPC but also around C3A grains in a mixture of alite, C3A and ...

EPFL2007

Petrography and geochemistry of the chassignite Northwest Africa 2737 (NWA 2737)

Philippe Gillet, Pierre Beck

We report on the petrology and geochemistry of the Northwest Africa 2737 (NWA 2737) meteorite that was recovered from the Morrocan Sahara in 2000. It is the second member of the chassignite subclass of the SNC (Shergotitte-Nakhlite-Chassignite) group of me ...

2006

An energy balance criterion for nanoindentation-induced single and multiple dislocation events

William Curtin, Ronald Earle Miller

Small volume deformation can produce two types of plastic instability events. The first involves dislocation nucleation as a dislocation by dislocation event and occurs in nanoparticles or bulk single crystals deformed by atomic force microscopy or small n ...

2006

Synthesis, structure and oxygen thermally programmed desorption spectra of La1−xCaxAlyFe1−yO3−δ perovskites

Jan Van Herle

Perovskites La1−xCaxAlyFe1−yO3−δ (x, y = 0 to 1) were prepared by high-temperature solid-state synthesis based on mixtures of oxides produced by colloidal milling. The XRD analysis showed that perovskites La0.5Ca0.5AlyFe1−yO3−δ with a high Fe content (1−y ...

2006

TEM study of a silicate-carbonate-microbe interface prepared by focused ion beam milling

Philippe Gillet

The biogeochemical alteration of an Mg-Fe orthopyroxene, reacted for 70 yr under and conditions in a desert environment, was Studied by transmission electron microscopy. For this purpose, an electron transparent cross-section of the interface between a sin ...

2005

A new nondestructive X-ray method for the determination of the 3D mineralogy at the micrometer scale

Philippe Gillet

The combination of synchrotron-based X-ray absorption and fluorescence computed tomographies (CT) is a new method allowing a noninvasive and nondestructive determination of the three-dimensional (3D) mineralogy with micrometer resolution of sub-millimeter ...

2004

Rinawoodite lamellae in olivine: Clues to olivine-ringwoodite phase transition mechanisms in shocked meteorites and subducting slabs

Philippe Gillet

The first natural occurrence of ringwoodite lamellae was found in the olivine grains inside and in areas adjacent to the shock veins of a chondritic meteorite, and these lamellae show distinct growth mechanism. Inside the veins where pressure and temperatu ...

2004

Three-dimensionally modulated incommensurate crystal structure of lazurite from the Baikal region

Gervais Chapuis

The three-dimensionally modulated incommensurate crystal structure of lazurite from the Baikal region was determined for the first time. The structure was solved within the cubic system with the unit-cell parameter a(cub) = 9.077(1) Angstrom and the (3+2)- ...

2003

Active Sites in HZSM-5 with Low Fe-content for the Formation of Surface Oxygen by Decomposing N2O: Is Every Deposited Oxygen Active?

Albert Renken, Lioubov Kiwi

Surface-active centers were detected in HZSM-5 with a low content of iron (

2003

Petrology and chemistry of the picritic shergottite North West Africa 1068 (NWA 1068)

Philippe Gillet

We report on the petrology and chemistry of North West Africa 1068 (NWA 1068), a shergottite recently recovered in Morocco. This meteorite has a total known mass of about 577 g and comprises 23 fragments. The largest fragment is a greenish-brown rock devoi ...

2002

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