0000000000281666

AUTHOR

J. P. Itie

showing 2 related works from this author

Sixfold coordinated phosphorus by oxygen in AlPO4 quartz homeotype under high pressure.

2007

International audience; AlPO4 belongs to the berlinite quartz homeotype family, which has been the subject of intense high pressure research triggered by the supposed existence of reversible pressure induced amorphization. New x-ray diffraction experiments, complemented with ab initio calculations, demonstrate the existence of two high pressure crystalline polymorphs and show that AlPO4 share the same two stage densification mechanism as silica. In first place a compact hexagonal sublattice of oxygen atoms is formed. In a second step the cations redistribute in the interstices giving rise to a monoclinic distorted CaCl2 phase. The most outstanding feature of the new phase is that phosphorou…

DiffractionMaterials scienceInorganic chemistrychemistry.chemical_element02 engineering and technology010403 inorganic & nuclear chemistry01 natural sciencesOxygenAb initio quantum chemistry methodsStructural Biology0103 physical sciences[CHIM]Chemical SciencesGeneral Materials Science010306 general physicsQuartzBerliniteMechanical EngineeringPhosphorusGeneral ChemistryCondensed Matter Physics021001 nanoscience & nanotechnology0104 chemical sciencesCrystallographychemistryMechanics of MaterialsClose relationshipHigh pressure0210 nano-technologyMonoclinic crystal system
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A study of KNbO3in the pressure range to 12 GPa using synchrotron radiation

1997

Abstract Orthorhombic KNbO3 has been studied by x-ray diffraction as a function of pressure. The lattice cell parameters, volume and stability range of this phase have been determined as a function of the applied pressure. No structural transformation has been observed up to 12 GPa. The resulting P-V data are fitted to a Murnaghan equation state of first-order.

DiffractionMaterials sciencebusiness.industrySynchrotron radiationThermodynamicsCondensed Matter PhysicsStructural transformationElectronic Optical and Magnetic MaterialsPressure rangeCondensed Matter::Materials ScienceOpticsLattice (order)Orthorhombic crystal systembusinessFerroelectrics Letters Section
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