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Stoichiometry and Deposition Temperature Dependence of the Microstructural and Electrical Properties of Barium Strontium Titanate Thin Films

Description: Barium Strontium Titanate (BST) was deposited on Pt/ZrO2 / SiO2/Si substrates using liquid source metal organic chemical vapor deposition. A stoichiometry series was deposited with various GrII/Ti ratios (0.658 to 1.022) and a temperature series was deposited at 550 to 700°C. The thin films were characterized using transmission electron microscopy. Both series of samples contained cubic perovskite BST and an amorphous phase. The grain size increased and the volume fraction of amorphous phase decreased with increasing deposition temperature. The electrical and microstructural properties improved as the GrII/Ti ratio approached 1 and deteriorated beyond 1. This research demonstrates that BST thin films are a strong candidate for future MOS transistor gate insulator applications.
Date: May 1998
Creator: Pena, Piedad
Partner: UNT Libraries

Survey of Non-Triple Option and Triple Option Football Formation Success in Class AAAA Texas High Schools from 1968 to 1975

Description: This study was designed to survey the 239 Class AAAA high schools in Texas from 1968 to 1975. The purpose of the study was to determine the difference in the number of wins of non-triple option and triple option teams. A Tukey t test was computed on the data received from the Class AAAA schools to determine if a significant difference existed. Computation of data revealed that in no year was there a significant difference in the number of wins of non-triple option and triple option teams. The conclusion of this investigation is the type of offensive football formation does not significantly affect the prospects of winning or losing games.
Date: August 1977
Creator: Poteet, Don
Partner: UNT Libraries

The Correlation Between Carbon-Proton and Proton-Proton Coupling Constants

Description: The correlation between the carbon-proton and proton-proton coupling constants have been studied in various 13 systems. Isocrotonic acid-carboxyl-3C, crotonic acid- 13 13 carboxyl-3C, and 5-norbornene-2-carboxylic acid-carboxyl-3C- 1,5,6,7,7-hexachloro were synthesized and their carbonproton coupling constants were analyzed. Nmr studies showed the magnitudes of the carbon-proton coupling constants to correlate well with analogous protonproton coupling constants, although the values of the couplings were larger than expected. The geminal olefinic couplings were considerably larger than all other couplings, but they were self-consistent. The signs of the carbon-proton coupling constants also were in agreement without exception with the signs of analogous proton-proton coupling constants.
Date: December 1975
Creator: Seiwell, Ruth R.
Partner: UNT Libraries