6533b851fe1ef96bd12a8cf6
RESEARCH PRODUCT
EXAFS Study of PressureInduced Phase Transition in SrWO4
François BaudeletJ. P. ItiJuris PuransAlexei KuzminR. KalendarevP. MunschA. Congedutisubject
Phase transitionMaterials scienceExtended X-ray absorption fine structureAbsorption spectroscopychemistry.chemical_elementTungstenCondensed Matter PhysicsAtomic and Molecular Physics and OpticsDiamond anvil cellCrystallographyTetragonal crystal systemchemistryPhase (matter)Mathematical PhysicsMonoclinic crystal systemdescription
Pressure-induced scheelite-to-wolframite structural phase transition in SrWO4 was studied using two complementary techniques—x-ray absorption spectroscopy and x-ray diffraction (XRD). In situ XRD and W L3-edge EXAFS measurements were performed using the synchrotron radiation. The experiments were done at room temperature in the pressure range from 0 to 30 GPa using the diamond anvil cell. The XRD results unambiguously show that SrWO4 transforms from the tetragonal scheelite phase to the monoclinic wolframite-type phase at about 11.7 GPa. Locally this transition appears as a change of the tungsten ions coordination from regular tetrahedral to distorted octahedral. The analysis of the EXAFS data suggests that tungsten ions displace from the centres of the tetrahedra by about 0.04 A and some nearest oxygen atoms relax by about 0.23 A.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2005-01-01 | Physica Scripta |