Physics – Condensed Matter – Materials Science
Scientific paper
2011-11-16
Physical Review B 85, 024108 (2012)
Physics
Condensed Matter
Materials Science
32 pages, 9 figures, 3 tables
Scientific paper
10.1103/PhysRevB.85.024108
We have performed an experimental study of the crystal structure, lattice-dynamics, and optical properties of PbCrO4 (the mineral crocoite) at ambient and high pressures. In particular, the crystal structure, Raman-active phonons, and electronic band-gap have been accurately determined. X-ray-diffraction, Raman, and optical-absorption experiments have allowed us also to completely characterize two pressure-induced structural phase transitions. The first transition is isostructural, maintaining the monoclinic symmetry of the crystal, and having important consequences in the physical properties; among other a band-gap collapse is induced. The second one involves an increase of the symmetry of the crystal, a volume collapse, and probably the metallization of PbCrO4. The results are discussed in comparison with related compounds and the effects of pressure in the electronic structure explained. Finally, the room-temperature equation of state of the low-pressure phases is also obtained.
Bandiello E.
Errandonea Daniel
Manjon F. J.
Martinez-Garcia D.
Santamaria-Perez David
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