Effect of heat treatment in HF atmosphere on the optical and electrical properties of BaF2 ceramics

Using optical spectroscopy and complex impedance measurements, we have studied the transmission spectra and electrical conductivity of different BaF 2 samples: ceramic prepared by vacuum hot pressing (200 MPa, 870°C, 20 min), the same ceramic after heat treatment in a reactive HF atmosphere (1200°C,...

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Bibliographic Details
Published in:Inorganic materials 2009-10, Vol.45 (10), p.1188-1192
Main Authors: Sorokin, N. I., Karimov, D. N., Komar’kova, O. N., Krivandina, E. A., Smirnov, A. N., Chernov, S. P., Sobolev, B. P.
Format: Article
Language:English
Subjects:
Atmospheres
Ceramics
Chemistry
Chemistry and Materials Science
Heat treatment
Hot pressing
Industrial Chemistry/Chemical Engineering
Inorganic Chemistry
Materials Science
Melts
Resistivity
Single crystals
Spectra
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Summary:Using optical spectroscopy and complex impedance measurements, we have studied the transmission spectra and electrical conductivity of different BaF 2 samples: ceramic prepared by vacuum hot pressing (200 MPa, 870°C, 20 min), the same ceramic after heat treatment in a reactive HF atmosphere (1200°C, 120 min), and a single crystal grown from the melt in vacuum. Heat treatment of the as-prepared BaF 2 ceramic in a fluorination atmosphere increases its optical transmission in the range 0.2–0.8 µm on average by a factor of 2 and markedly reduces the selective absorption in the range 6–11 µm. The heat-treated BaF 2 ceramic is close in ionic conductivity to the BaF 2 single crystal.
ISSN:0020-1685
1608-3172
DOI:10.1134/S0020168509100197