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O − Centers as Strong Phonon Scatterers in KCl and KBr Crystals
Author(s) -
Kurz G.
Publication year - 1969
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.19690340130
Subject(s) - ion , scattering , phonon , dissociation (chemistry) , doping , vacancy defect , thermal conductivity , atmospheric temperature range , conductivity , phonon scattering , materials science , crystallography , chemistry , atomic physics , analytical chemistry (journal) , condensed matter physics , optics , physics , thermodynamics , organic chemistry , chromatography , composite material
The thermal conductivity of pure and hydroxide doped KCl and KBr crystals and its change upon OH − dissociation was measured. The temperature range covered is 1.8 to 22°K. The dissociation of OH − ions into O − and U 2 centers causes a marked reduction of the thermal conductivity curve below 10°K. The scattering cross section of the U 2 centers is shown to be small, thus the strong phonon scattering can be attributed to the O − centers alone. The O − ion is suggested to occupy an off‐center equilibrium position in the anion vacancy, the accompanying tunnel splitting thus giving rise to a low lying resonance.
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