"The development of the tensi-volumetric apparatus has been traced to its current position of significance in studies relating to oxide non-stoichiometry. Components of the tensi-volumetric apparatus, especially the capacitance membrane manometer, were examined in detail as were the parameters affecting the performance of such an apparatus. Based on a careful consideration of components and performance, a tensi-volumetric apparatus has been designed, built, and its operation theoretically justified for its particular physical configuration. Results of existing studies of the oxygen non-stoichiometry of barium titanate have been used to predict its behavior during a tensi-volumetric study. Specific analytical procedures developed for use with the present tensi-volurnetric system were applied to pure, polycrystalline barium titanate powder at 900ºC over the pressure range 10⁻⁴ mm Hg to 740 mm Hg in a pure oxygen atmosphere. Results of the application of these procedures exhibit a p-n transition in the region of 1 mm Hg. The maximum oxygen non-stoichiometry at 900ºC and 3 mm Hg was found to correspond to BaTiO3+Δ where Δ = 1.1 x 10⁻⁵. The diffusion coefficient for the predominent diffusing species on the p side of the transition was found to equal 1.9 x 10⁻¹⁵ cm²/sec. These results and the performance of the system are discussed"--Abstract, page ii.
Anderson, H. U. (Harlan U.)
Snow, William R.
Materials Science and Engineering
M.S. in Ceramic Engineering
University of Missouri--Rolla
vii, 129 pages
© 1972 Glenn Jon Conger, All rights reserved.
Thesis - Open Access
Volumetric apparatus -- Calibration
Barium compounds -- Analysis
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Link to Catalog Record
Conger, Glenn Jon, "A tensi-volumetric apparatus: theory, calibration, and use in an investigation of the oxygen non-stoichiometry of pure BaTiO₃" (1972). Masters Theses. 5069.