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Synthesis and study of novel silicon-based unsaturated polymers

Description: Novel unsaturated polymers have been synthesized and studied as precursors to silicon carbide and third order nonlinear optical materials. X ray structures were obtained. Kinetic and mechanistic studies of the unique thermal isomerization of dimethylenedisilacyclobutane to a carbene were conducted.
Date: June 19, 1995
Creator: Lin, J.
Partner: UNT Libraries Government Documents Department
open access

Magnetization studies of oxides related to the high temperature cuprate superconductors

Description: The magnetic properties related to the following high temperature superconductors were measured utilizing a Faraday magnetometer: BaCuO{sub 2+x}, La{sub 2} CuO{sub 4}, Sr{sub 2} RhO{sub 4}, Sr{sub 2} VO{sub 4}, and Sr{sub 2} CuO{sub 3}. Neutron diffraction, magnetic susceptibility, and heat capacity measurements are discussed.
Date: June 19, 1995
Creator: Wang, Z.
Partner: UNT Libraries Government Documents Department
open access

Sub-micron scale conduction processes on clean surfaces

Description: Electrical conductance has been measured in-situ in two dimensions in the Ag/Si(111) system as a function of incident adatom flux rate with a 4-probe method. A conductance study in a 3-D conical structure was also made using field emission. For the 2-D study, the origin of conduction is still unclear, as transport by percolating Ag clusters and conduction through the substrate lvia electrons from the film have both been suggested. Experiments varying the flux rate were conducted to decide betwe… more
Date: June 19, 1995
Creator: Kimberlin, K.
Partner: UNT Libraries Government Documents Department
open access

New electrolyte systems for capillary zone electrophoresis of metal cations and non-ionic organic compounds

Description: Excellent separations of metal ions can be obtained very quickly by capillary electrophoresis provided a weak complexing reagent is incorporated into the electrolyte to alter the effective mobilities of the sample ions. Indirect photometric detection is possible by also adding a UV-sensitive ion to the electrolyte. Separations are described using phthalate, tartrate, lactate or hydroxyisobutyrate as the complexing reagent. A separation of twenty-seven metal ions was achieved in only 6 min using… more
Date: June 19, 1995
Creator: Shi, Y.
Partner: UNT Libraries Government Documents Department
open access

Oxidation and creep behavior of Mo*5*Si*3* based materials

Description: Mo{sub 5}Si{sub 3} shows promise as a high temperature creep resistant material. The high temperature oxidation resistance of Mo{sub 5}Si{sub 3} has been found to be poor, however, limiting its use in oxidizing atmospheres. Undoped Mo{sub 5}Si{sub 3} exhibits mass loss in the temperature range 800{degrees}-1200{degrees}C due to volatilization of molybdenum oxide, indicating that the silica scale does not provide a passivating layer. The addition of boron results in protective scale formation an… more
Date: June 19, 1995
Creator: Meyer, Mitch
Partner: UNT Libraries Government Documents Department
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