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The optical-absorption edge of single crystals of CaWO4, SrWO4, BaWO4, andPbWO4 has been measured under high pressure up to ~20 GPa at room temperature.From the measurements we have obtained the evolution of the band-gap energywith pressure. We found a low-pressure range (up to 7-10 GPa) wherealkaline-earth tungstates present a very small Eg pressure dependence (-2.1 <dEg/dP < 8.9 meV/GPa). In contrast, in the same pressure range, PbWO4 has apressure coefficient of -62 meV/GPa. The high-pressure range is characterizedin the four compounds by an abrupt decrease of Eg followed by changes indEg/dP. The band-gap collapse is larger than 1.2 eV in BaWO4. We alsocalculated the electronic-band structures and their pressure evolution.Calculations allow us to interpret experiments considering the differentelectronic configuration of divalent metals. Changes in the pressure evolutionof Eg are correlated with the occurrence of pressure-induced phase transitions.The band structures for the low- and high-pressure phases are also reported. Nometallization of any of the compounds is detected in experiments nor ispredicted by calculations.

A combined high-pressure experimental and theoretical study of the electronic band-structure of scheelite-type AWO4 (A = Ca, Sr, Ba, Pb) compounds