"The Ba2YCu3O7-x system was investigated using thermogravimetric, thermopower, and d.c. electrical conductivity techniques. The system was found to exhibit a semiconductor to metallic transition coincident with the documented orthorhombic to tetragonal phase transition. Conduction is accomplished in the semiconducting phase by an activated small hopping polaron mechanism. The oxide was observed to be a p-type semiconductor over the temperature and oxygen activity ranges studied.
The conductivity, carrier concentration, and mobility behaviors of the oxide are primarily functions of its oxygen content. All three properties exhibited only a slight temperature dependence. The carrier concentration is essentially constant at a given oxygen content. The carrier concentration ranged from about 0.5 x 1021/cm3 at 800°C and O = 6.3 to 6 x 1021/cm3 at 500°C and O = 6.95. Mobilities ranged from about 0.05 cm2/V sec. at 600°C and O = 6.4 to 0.5 at 800°C and O = 6.7"--Abstract, page ii.
Anderson, H. U. (Harlan U.)
Moore, Robert E., 1930-2003
Ownby, P. D.
Guha, Jyoti, P.
Sparlin, Don M.
Pringle, Oran Allan
Materials Science and Engineering
Ph. D. in Ceramic Engineering
United States. Department of Energy
University of Missouri--Rolla
viii, 122 pages
© 1989 C. John Brannon, All rights reserved.
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Brannon, C. John, "Thermogravimetric, thermopower, and electrical conductivity studies of the Ba₂YCu₃O₇₋ₓ system" (1989). Doctoral Dissertations. 714.
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