Effect of Heat Treatment in HF Atmosphere on the Optical and Electrical Properties of BaF2 Ceramicsстатья
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Дата последнего поиска статьи во внешних источниках: 19 ноября 2013 г.
Аннотация:Using optical spectroscopy and complex impedance measurements, we have studied the transmission spectra and electrical conductivity of different BaF2 samples: ceramic prepared by vacuum hot pressing (200 MPa, 870 degrees C, 20 min), the same ceramic after heat treatment in a reactive HF atmosphere (1200 degrees C, 120 min), and a single crystal grown from the melt in vacuum. Heat treatment of the as-prepared BaF2 ceramic in a fluorination atmosphere increases its optical transmission in the range 0.2-0.8 mu m on average by a factor of 2 and markedly reduces the selective absorption in the range 6-11 mu m. The heat-treated BaF2 ceramic is close in ionic conductivity to the BaF2 single crystal.