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Absorption and electrical conductivity of CaMoO 4 crystals
Author(s) -
Bollmann W.
Publication year - 1978
Publication title -
kristall und technik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0023-4753
DOI - 10.1002/crat.19780130816
Subject(s) - ion , absorption (acoustics) , electrical resistivity and conductivity , diffusion , materials science , conductivity , analytical chemistry (journal) , irradiation , attenuation coefficient , chemistry , optics , physics , thermodynamics , organic chemistry , chromatography , quantum mechanics , nuclear physics , composite material
The electrical conductivity σ of CaMoO 4 crystals was investigated between room temperature and 850°C. The mobility v v and the diffusion coefficient D v of the O − ion vacancies have been derived from σ: v v T = 3300 exp (−1.52 eV/ kT ) cm 2 K/Vs, D v = (0.1…1) × exp (−1.52 eV/ kT ) cm 2 /s. An absorption occuring in crystals which are reduced or X‐irradiated at low temperatures is dichroitic and caused by Mo 5+ ions. For measurement in c direction the oscillator strength of the 680 nm absorption band is found to be about 0.1.