Effects of high pressure on the optical absorption spectrum of scintillating PbWO4 crystals

Details Effects of high pressure on the optical absorption spectrum of scintillating PbWO4 crystals Effects of high pressure on the optical absorption spectrum of scintillating PbWO4 crystals

2006-05-26

arxiv.org/abs/cond-mat/0605649v2

Applied Physics Letters 89, 091913 (2006)

Physics

Condensed Matter

Materials Science

14 pages, 3 figures

Scientific paper

10.1063/1.2345228

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.

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