6533b85cfe1ef96bd12bc04e
RESEARCH PRODUCT
Effects of high pressure on the optical absorption spectrum of scintillating PbWO4 crystals
Daniel ErrandoneaR. Lacomba-peralesAlfredo SeguraD. Martínez-garcíaJavier Ruiz-fuertessubject
Condensed Matter - Materials SciencePhase transitionPhysics - Instrumentation and DetectorsMaterials sciencePhysics and Astronomy (miscellaneous)Absorption spectroscopyCondensed matter physicsMaterials Science (cond-mat.mtrl-sci)FOS: Physical sciencesInstrumentation and Detectors (physics.ins-det)Electronic structurePressure coefficientAbsorption edgeHigh pressuredescription
The pressure behavior of the absorption edge of PbWO4 was studied up to 15.3 GPa. It red-shifts at -71 meV/GPa below 6.1 GPa, but at 6.3 GPa the band-gap collapses from 3.5 eV to 2.75 eV. From 6.3 GPa to 11.1 GPa, the absorption edge moves with a pressure coefficient of -98 meV/GPa, undergoing additional changes at 12.2 GPa. The results are discussed in terms of the electronic structure of PbWO4 which attribute the behavior of the band-gap to changes in the local atomic structure. The changes observed at 6.3 GPa and 12.2 GPa are attributed to phase transitions.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2006-08-28 | Applied Physics Letters |