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

Abstract

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.

14 pages, 3 figures

References in corpus (1)

• Determination of the high-pressure crystal structure of BaWO4 and PbWO4

Cited by in corpus (12)

• Pressure effects on the structural and electronic properties of ABX4 scintillating crystals
• Optical absorption of divalent metal tungstates: Correlation between the band-gap energy and the cation ionic radius
• High-pressure x-ray diffraction study of SrMoO4 and pressure-induced structural changes
• Combined Raman scattering and ab initio investigation of pressure-induced structural phase transitions in the scintillator ZnWO4
• Zircon to monazite phase transition in CeVO4
• Landau theory applied to phase transitions in calcium orthotungstate and isostructural compounds
• High-pressure effects on the optical-absorption edge of CdIn2S4, MgIn2S4, and MnIn2S4 thiospinels
• Pressure-induced phase transition and bandgap collapse in the wide-bandgap semiconductor InTaO4
• High-pressure x-ray diffraction study of bulk and nanocrystalline PbMoO4
• Optical and structural study of the pressure-induced phase transition of CdWO${}_4$
• The high-pressure behavior of CaMoO4
• High-pressure characterization of multifunctional CrVO4