Search results for "Calcium tungstate"

showing 2 items of 2 documents

Transient Optical Absorption and Luminescence in Calcium Tungstate Crystal

2001

CrystalPhotoluminescenceAbsorption spectroscopyChemistryExcitonAnalytical chemistryCalcium tungstateTransient (oscillation)Condensed Matter PhysicsLuminescenceAbsorption (electromagnetic radiation)Electronic Optical and Magnetic Materialsphysica status solidi (b)
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Quasi-hydrostatic X-ray powder diffraction study of the low- and high-pressure phases of CaWO4 up to 28 GPa

2014

We have studied CaWO4 under compression using Ne as pressure-transmitting medium at room temperature by means of synchrotron X-ray powder diffraction. We have found that CaWO4 beyond 8.8 GPa transforms from its low-pressure tetragonal structure (scheelite) into a monoclinic structure (fergusonite). The high-pressure phase remains stable up to 28 GPa and the low-pressure phase is totally recovered after full decompression. The pressure dependence of the unit-cell parameters, as well as the pressure volume equation of state, has been determined for both phases. Compared with previous studies, we found in our quasi-hydrostatic experiments a different behavior for the unit-cell parameters of th…

Phase transitionEquation of stateMaterials scienceScheeliteThermodynamicsGeneral ChemistryCondensed Matter PhysicsFergusoniteX-ray diffractionHigh pressureTetragonal crystal systemCrystallographyFISICA APLICADAPhase (matter)X-ray crystallographyCalcium tungstateGeneral Materials SciencePowder diffractionPhase transitionMonoclinic crystal systemSolid State Sciences
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