Thermogravimetric, thermopower, and electrical conductivity studies of the Ba₂YCu₃O₇₋ₓ system

<p>"The Ba₂YCu₃O_7-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.</p> <p>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.</p>

Name thesis:degree_name

Ph. D. in Ceramic Engineering

Grantor

University of Missouri--Rolla

Year dc:date.available

2016

Author dc:creator

• Brannon, C. John

• Ceramic Materials

Repository record dc:identifier

https://scholarsmine.mst.edu/doctoral_dissertations/714

OAI identifier oai:identifier

oai:scholarsmine.mst.edu:doctoral_dissertations-1716