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Pressure effects on transition metal monoxide NiO
Author(s) -
Ishida Y.,
Mita Y.,
Kobayashi M.,
Endo S.
Publication year - 2003
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200301610
Subject(s) - raman spectroscopy , non blocking i/o , materials science , monoxide , hydrostatic pressure , nickel , transition metal , single crystal , absorption (acoustics) , metal , hydrostatic equilibrium , molecular physics , optics , chemistry , crystallography , metallurgy , composite material , thermodynamics , biochemistry , physics , catalysis , quantum mechanics
Raman and absorption measurements under high pressure were performed in NiO single crystals at room temperature. A drastic increase of the absorption intensity was observed in the whole visible range. Furthermore, the intensity of a defect induced Raman peak located around 500 cm –1 becomes remarkably, especially at 25 GPa. Neither of the spectral changes recover even after removing the pressure. These results indicate that a permanent lattice disorder is introduced. The remarkable spectral changes are explained to be a result of defects (especially singly charged nickel vacancies) introduced by a deformation of the crystal due to the non‐hydrostatic compression.