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RESEARCH PRODUCT
Growth, characterization, and high-pressure optical studies of CuWO4
Alfredo SeguraZh. ZhuDaniel ErrandoneaC. Y. TuFrancisco Javier ManjónJavier Ruiz-fuertessubject
chemistry.chemical_elementElectronic structureCrystal structureTriclinic crystal systemCondensed Matter PhysicsCoppersymbols.namesakeCrystallographychemistry.chemical_compoundOctahedronchemistryTungstatesymbolsRaman spectroscopyRaman scatteringdescription
Copper tungstate (CuWO4) crystals grown by the top-seeded solution growth method were characterized by X-ray diffraction, Raman scattering, and optical measurements. CuWO4 has a triclinic structure (P 1¯) with a = 4.709 A, b = 5.845 A, c = 4.884 A, α = 88.3°, β = 92.5°, and γ = 97.2°. It consists of corner-linked CuO6 and WO6 octahedra, the former having a pseudo-tetragonally elongated geometry caused by the Cu2+ Jahn–Teller effect. Fifteen out of the eighteen Raman modes of CuWO4 are reported, discussed, and compared with those of other tungstates. We also determined the indirect band-gap energy of CuWO4 (2.3 eV) and its negative pressure coefficient up to 25 GPa. The pressure evolution of the band-gap is discussed in terms of the electronic structure of CuWO4. Finally, no clear evidence of structural changes were found in our high-pressure experiments, but large amounts of defects are apparent beyond 18 GPa.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2008-12-01 | High Pressure Research |