Publication

An In-Situ High-Temperature Structural Study Of Stable And Metastable Caal2Si2O8 Polymorphs

Related publications (60)

Phase changes and amorphization of zeolites at high pressures: The case of scolecite and mesolite

Pressure-induced amorphous-phase transitions (amorphization) have been observed in framework silicates like quartz and feldspars. A similar crystalline to highly disordered solid phase transition is reported in this study for two zeolites, scolecite and me ...

1996

Numerical simulation of α-quartz under nonhydrostatic compression: Memory glass and five-coordinated crystalline phases

Philippe Gillet, James Badro

The behavior of alpha-quartz under hydrostatic and nonhydrostatic high-pressure conditions has been investigated in molecular dynamics simulations of silica in order to clarify the role of nonhydrostatic stresses in the amorphization process. It is shown t ...

1996

Comparison of structurally relaxed models of the Si(001)-SiO2 interface based on different crystalline oxide forms

Alfredo Pasquarello, Roberto Car

We present a comparative study of the structural properties of three different models for the Si(001)-SiO2 interface. The models are obtained by attaching different crystalline forms of SiO2, such as tridymite and beta-cristobalite, to Si(001). In the case ...

1996

Ultrafast dynamics of the B state of I2 in condensed rare gases

Majed Chergui

The resonance Raman overtone progressions of I2 in liq. Xe following excitation of the B state are discussed, and compared with similar data in solid Ar. It is shown that the Raman contribution from the B state is damped by predissocn. within one recurrenc ...

1995

Pressure-Induced Structural Modifications In Mg2Geo4-Olivine - A Raman-Spectroscopic Study

Philippe Gillet

Raman spectra of Mg2GeO4-olivine were obtained from ambient pressure up to 34 GPa at ambient temperature. Under quasi-hydrostatic pressure conditions, the following modifications in the Raman spectra occur as pressure increases: 1) near 11 GPa, two sharp e ...

1994

Femtosecond dynamics of I2(B 3Π0u+) in liquids from resonance Raman spectra

Majed Chergui

The intensity distributions in the overtones of resonance Raman spectra for I2 in liq. CCl4 and Xe are presented for several excitation energies in the bound part of the B 3P0u+ state. In liq. CCl4, the decrease in intensity with v" is monotonous and for ...

1994

Raman-Spectroscopy, X-Ray-Diffraction, And Phase Relationship Determinations With A Versatile Heating Cell For Measurements Up To 3600-K (Or 2700-K In Air)

Philippe Gillet

A simple, rapid, and inexpensive heating-wire technique is used for physical observations at high temperatures. The upper limit is 2000 K in air with platinum-iridium or platinum-rhodium wires and 2700 K with iridium; temperatures up to 3600 K can be achie ...

1993

Stability Of Magnesite (MgCO3) At Mantle Pressure And Temperature Conditions - A Raman-Spectroscopic Study

Philippe Gillet

The stability of magnesite (MgCO3) has been studied by Raman spectroscopy at high pressure and high temperature using a diamond-anvil cell heated by a CO2 laser. Raman spectra up to 32 GPa at room temperature unambiguously confirm that under quasi-hydrosta ...

Mineralogical Society of America1993

High-Pressure And High-Temperature Raman-Spectroscopy Of End-Member Garnets - Pyrope, Grossular And Andradite

Philippe Gillet

The effect of pressure (up to 22 GPa) and temperature (to 1300 K) on the Raman spectra has been measured for pyrope, grossular and andradite garnets. No phase changes were observed and all Raman modes increase or decrease linearly with pressure and tempera ...

1992

A Vibrational Study Of Phase-Transitions Among The GeO2 Polymorphs

Philippe Gillet

Infrared and Raman spectra of the quartz, rutile and amorphous forms of GeO2 have been recorded under pressure and/or temperature, in order to study the crystalline to crystalline - or amorphous - transformations of this compound in the solid state. X-ray ...

1991

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