Аннотация:https://drive.google.com/file/d/0ByXbAhJRjA7YbHdLMnQ5RUJBdjQ/view page 53
CuCr1-xMgxO2 solid solutions with magnesium content 0<x<0,03 were synthesized in forms of
polycrystalline ceramics and thin films. To achieve the uniform distribution of Mg-doping element in the samples, a chemical solution synthesis was performed and single phase ceramics was sintered in an argon atmosphere at 1000оС. Epitaxial thin
films were deposited by MOCVD on various single crystalline substrates.
XRD characterization, optical, Raman and ESR spectroscopy, as well as
electrical measurements were performed. The Raman spectra contained peaks
corresponding to Eg and A1g vibrational modes of CuCrO2, they were shifted to higher
frequencies by Mg-doping. The band gap value was determined from diffuse light
scattering spectra. The positive sign of Seebeck coefficient confirmed p-type of
electrical conductivity. The resistivity of the samples was decreased by more than 5
orders of magnitude with increasing magnesium content from 0 to 3 at .% and
amounted to 0.6 Ohms.cm at room temperature. The activation energy of electrical
conductivity in the samples doped with Mg was 4-5 times less than in the samples
without Mg, which confirms the different nature of the acceptor levels in undoped and
doped samples.