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Separation of hydrogen using thin film palladium-ceramic composite membrane

Description: The primary objective of this study was to prepare and characterize a hydrogen permselective palladium-ceramic composite membrane for high temperature gas separations and catalytic membrane reactors. Electroless plating method was used as a potential route to deposit a thin palladium film on microporous ceramic substrate. The objectives of the work presented here were to characterize the new Pd-ceramic composite membrane by SEM and EDX analysis and to carry out fundamental permeability measurem… more
Date: November 1, 1995
Creator: Ilias, S.; King, F.G.; Su, N. & Udo-Aka, U.I.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Electrical, mechanical, and radiation resistant properties of ceramics and ceramic-to-metal end seals for in-vessel FFTF or LMFBR instrumentation cables

Description: Results from the Hanford Engineering Development Laboratory (HEDL) experimental investigations of ceramics and ceramic-tometal end seals for reactor instrumentation cables were combined with information available in published reports from various laboratories to provide recommendations for further development of cables suitable for long-term, in-vessel operation in the Fast Flux Test Facility (FFTF) and in future liquid metal, fast breeder reactors (LMFBRs). The study focused on Al/sub 2/O/sub … more
Date: November 1, 1973
Creator: Muhlestein, L. D. & Philipp, L. D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Catalytic effects in coal gasification. Quarterly report, April-June 1980

Description: This quarterly report, for the period April through June 1980, summarizes the activities of Sandia National Laboratories' program on mineral matter effects in coal gasification. The objective is to determine the effects of mineral matter on the devolatilization of coal and on the subsequent char gasification. We have selected a basis set of Eastern bituminous coals whose mineral matter content, as determined by x-ray analysis of low-temperature ash, ranged from less than 5% to more than 20… more
Date: November 1, 1980
Creator: Padrick, T D
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Development of adherent ceramic coatings to reduce contact stress damage of ceramics

Description: Strongly adherent coatings were deposited on reaction bonded Si[sub 3]N[sub 4] (RBSN), sintered SiC (SSC), and HIP'ed Si[sub 3]N[sub 4] (HSN) and using a newly developed chemical vapor deposition (CVD) process. Performance of the coating was assessed by oxidation, strength and contact stress testing. A new method was developed to experimentally determine the strength and Weibull modulus of thin brittle films on ceramic substrates. A significant portion of the study was devoted to numerical mode… more
Date: November 1, 1992
Creator: Wayne, S.F.; Selverian, J.H. & O'Neil, D. (GTE Labs., Inc., Waltham, MA (United States))
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Test of dip cup instrumentation

Description: Instrumentation has been developed which will measure the alumina content of cryolite baths based upon the detection of a thermal arrest in the cooling curve when a small sample is pulled from the bath using a graphite cup. Detection of the temperature at which thermal arrest occurs is automatic, and an alumina content is automatically calculated and displayed. Recent measurements at a production plant indicate a standard error of 0.38% or less in the determination of alumina content based upon… more
Date: November 1, 1988
Creator: Brenden, B.B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Apparatus for simultaneous measurement of mass change, optical transmittance, and reflectance of thin films

Description: An apparatus consisting of a vacuum ultramicrobalance and optical equipment for measuring transmittance and front surface reflectance of thin films from 400 to 800 nm is described. Thin films formed on substrates by thermal or reactive evaporation can be heated in reactive gases of different compositions and pressures. As the chemical composition of the film changes, the optical changes in the film can be monitored simultaneously using computerized data collection, control, and analysis. Repres… more
Date: November 1, 1978
Creator: Czanderna, A.W.; Helbig, H. & Prince, E.T.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Irradiation performance of oxide dispersion strengthened copper alloys to 150 dpa at 415{degree}C

Description: Results have been obtained on the post-irradiation properties of various oxide dispersion strengthened copper alloys irradiated from 34 to 150 dpa at 415{degrees}C in the Fast Flux Test Facility. The GlidCop alloys strengthened by Al{sub 2}O{sub 3} continue to outperform other alloys with respect to swelling resistance, and retention of both electrical conductivity and yield strength. Several castable ODS alloys and a Cr{sub 2}O{sub 3}-strengthened alloy show increasingly poor resistance to rad… more
Date: November 1, 1991
Creator: Edwards, D. J.; Kumar, A. S.; Anderson, K. R.; Stubbins, J. F.; Garner, F. A. & Hamilton, M. L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Oriented Si and Ge nanocrystals formed in Al{sub 2}O{sub 3} by ion implantation and annealing

Description: Ion implantation followed by thermal annealing in a reducing atmosphere has been used to create a high density of oriented Si and Ge nanocrystals in (0001) Al{sub 2}O{sub 3}. Both types of nanocrystals are three-dimensionally aligned with respect to the Al{sub 2}O{sub 3} matrix, but the orientational relationships are different, and the two types of nanocrystals have different shapes in Al{sub 2}O{sub 3} Implantation of Si and Ge in fused silica also produces nanocrystals, but in this case, the… more
Date: November 1, 1993
Creator: White, C. W.; Budai, J. D.; Withrow, S. P.; Pennycook, S. J.; Zhou, D. S.; Vo Dinh, T. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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LuAlO{sub 3}: A high density, high speed scintillator for gamma detection

Description: We present measurements of the scintillation properties cerium doped lutetium aluminum perovskite, LuAlO{sub 3}:C, new dense ({rho}=8.34 g/cm{sup 3}) inorganic scintillator. This material has a 511 keV interaction length and photoelectric fraction 1.1 cm and 32% respectively, which are well suited to gamma ray detection. In powdered form with 0.5% cerium concentration, the scintillation light output is estimated to be 9,600 photons/MeV of deposited energy, the emission spectrum is a single peak… more
Date: November 1, 1994
Creator: Moses, W. W.; Derenzo, S. E.; Fyodorov, A.; Korzhik, M.; Gektin, A.; Minkov, B. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Fracture behavior of 20% Nb particulate reinforced alumina composite

Description: The composites consist of alumina matrix with 0.05 wt % MgO and 20 Vol % Nb with an average particle size of 30 to 100 microns produced by dry mixing and sintering to near their theoretical densities. Fracture toughness tests were carried out in three point bending on chevron notched samples. Results indicate that R-curve of the composites exhibited more than 300% increase in crack growth resistance compared to crack growth resistance of alumina produced with the identical procedures. Crack gro… more
Date: November 1, 1993
Creator: Lane, S.; Biner, S. B. & Buck, O.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Pressure-temperature sensors: Solution deposition of rare earth doped garnet films

Description: An aqueous route to the deposition of multicomponent metal oxide films is based upon the complexation of precursor metal nitrate salts by glycine, or other organic complexant, followed by spin-coating the homogeneous solution onto pretreated silica substrates. Glycine serves to frustrate the formation of cation oxides, thus precipitation. Upon dehydration, a glassy matrix results through which metal cations and nitrate anions are homogeneously dispersed. Subsequent heating of coated substrates … more
Date: November 1, 1993
Creator: Hess, N. J. & Exarhos, G. J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Ionic conduction mechanisms in CaF{sub 2} and CaF{sub 2}-Al{sub 2}O{sub 3} nanocomposite films on Al{sub 2}O{sub 3} substrates

Description: Thin films of pure CaF{sub 2} and nanocomposite mixtures of Al{sub 2}O{sub 3} with CaF{sub 2} were sublimated on Al{sub 2}O{sub 3} substrates. Interdigital electrodes allowed in situ measurements of the electrical conduction vs thickness, deposition rate, composition, time, and temperature. Conductivity in pure CaF{sub 2} adjacent to an Al{sub 2}O{sub 3} interface sometimes exceeded the bulk CaF{sub 2} conductivity (i.e., value at more than 50 nm distance) by as much as a factor of 6700 at 200C… more
Date: November 1, 1993
Creator: Modine, F. A.; Lubben, D. & Bates, J. B.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Large-area triple-junction a-Si alloy production scaleup. Annual subcontract report, 17 March 1993--18 March 1994

Description: The objective of this subcontract over its three-year duration is to advance Solarex`s photovoltaic manufacturing technologies, reduce its a-Si:H module production costs, increase module performance and expand the Solarex commercial production capacity. Solarex shall meet these objectives by improving the deposition and quality of the transparent front contact, by optimizing the laser patterning process, scaling-up the semiconductor deposition process, improving the back contact deposition, sca… more
Date: November 1, 1994
Creator: Oswald, R. & Morris, J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Aluminum oxide film thickness and emittance

Description: Aluminum reactor components which are not actively cooled could be subjected to high temperatures due to gamma heating after the core coolant level dropped during the ECS phase of a hypothetical LOCA event. Radiative heat transfer is the dominant heat transfer process in this scenario and therefore the emittance of these components is of interest. Of particular interest are the safety rod thimbles and Mark 60B blanket assemblies; for the K Reactor, these components have been exposed to low temp… more
Date: November 1, 1991
Creator: Thomas, J. K. & Ondrejcin, R. S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Superconducting Tl{sub 2}Ba{sub 2}CaCu{sub 2}O{sub 8} thin films prepared by post-annealing in a flow-through multiple-zone furnace

Description: Tl{sub 2}Ba{sub 2}CaCu{sub 2}O{sub 8} thin films were prepared for the first time by use of a multiple-zone flow-through thallination process. Thallous oxide was volatilized from condensed thallium oxide in a low temperature source zone and convectively transported to a higher temperature thallination zone in which initially amorphous Ba{sub 2}CaCu{sub 2}O{sub 5} precursor films were located. By careful control of the source temperature, film temperature, flow rate, anneal time, and rates of he… more
Date: November 1, 1994
Creator: Pluym, T. C.; Muenchausen, R. E. & Arendt, P. N.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Electron microscopy of AlN-SiC interfaces and solid solutions

Description: In a 2H AlN-SiC solid solution grown by MBE on {alpha}(6H)-SiC (3{degrees} from [0001]), the epilayer contained a high density of basal faults related to {approximately}5 nm steps on the growth surface: no compositional inhomogeneity was detected by PEELS. In diffusion couples of polycrystalline, sintered AlN on SiC annealed at 1600 and 1700{degrees}C. 8H sialon [nominally (AlN){sub 2}Al{sub 2}O{sub 3}] formed at the interface of SiC and recrystallized epitactic AlN grains, and Si{sub 3}N{sub 4… more
Date: November 1, 1993
Creator: Bentley, J.; Tanaka, S. & Davis, R. F.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Oxidation behavior of aluminum nanopowders

Description: Rutherford backscattering spectrometry, thermogravimetric analysis, and high-resolution transmission electron microscopy were used to investigate the oxidation behavior of ultrafine grain aluminum powder. Fractional change in mass of Al powder samples were obtained as a function of temperature and exposure time for samples with different particle size distributions. Activation energy for oxidation is found to depend on average Al particle size and to be much smaller than that known for flat Al … more
Date: November 1, 1994
Creator: Aumann, C. E.; Skofronick, G. L. & Martin, J. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Surface analyses and modelling of rate multiplicity and instabilities

Description: Catalytic partial and complete oxidations of chemical species are a quite important class of reactions in the production of many commercial chemicals and in the elimination of environmental pollutants. This research focuses on a sub-class of oxidation reactions in which CO is a key player -- be it a reactant, intermediate, or product -- in the catalytic sequence and chemistry. The first three years of our research has followed two parallel paths which have a common destination and which togethe… more
Date: November 1, 1990
Creator: Harold, M. P. & Conner, W. C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Materials analyses of ceramics for glass furnace recuperators

Description: The use of waste heat recuperation systems offers significant promise for meaningful energy conservation in the process heat industries. This report details the analysis of candidate ceramic recuperator materials exposed to simulated industrial glass furnace hot flue gas environments. Several candidate structural ceramic materials including various types of silicon carbide, several grades of alumina, mullite, cordierite, and silicon nitride were exposed to high-temperature flue gas atmospheres … more
Date: November 1, 1979
Creator: Weber, G. W. & Tennery, V. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Electron microscopy study of MOCVD-grown TiO sub 2 thin films and TiO sub 2 /Al sub 2 O sub 3 interfaces

Description: TiO{sub 2} thin films grown on (11{bar 2}0) sapphire at 800{degree}C by the MOCVD technique have been characterized by transmission electron microscopy. The TiO{sub 2} thin films are single crystalline and have the rutile structure. The epitaxial orientation relationship between the TiO{sub 2} thin films (R) and the substrate (S) has been found to be: (101)(0{bar 1}0){sub R}{parallel}(11{bar 2}0)(0001){sub S}. Growth twins in the films are commonly observed with the twin plane {l brace}101{r br… more
Date: November 1, 1990
Creator: Gao, Y.; Merkle, K. L.; Chang, H. L. M.; Zhang, T. J. & Lam, D. J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Hot coal gas desulfurization with manganese based sorbents. Quarterly report, June--September 1994

Description: The focus of work being performed on hot coal gas desulfurization at the Morgantown Energy Technology Center is primarily in the use of zinc titanate sorbents; however, prior studies indicated that an alternate sorbent, manganese dioxide-containing ore in mixture with alumina (75 wt% ore + 25 wt% Al{sub 2}O{sub 3}) appears to be a strong contender to zinc-based sorbents. Manganese, for example, has a lower vapor pressure in the elemental state than zinc; hence, it is not as likely to undergo zi… more
Date: November 1, 1994
Creator: Hepworth, M.T. & Slimane, R.B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Methyl chloride via oxyhydrochlorination of methane. Quarterly technical progress report No. 12, July--September 1994

Description: Significant progress was made in six different technical areas during this quarter. These key highlights are: (1) Mixed LnCl{sub 3} solutions were successfully tested as substitutes for LaCl{sub 3} in preparing OHC catalysts. This will dramatically lower the price of the catalyst. (2) Six catalyst samples were received from UCI. Each was made via either incipient wetness or compounded extrudate techniques. Four of the catalysts have been screened. All seem adequate. (3) Contact has opened with … more
Date: November 1, 1994
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Epitaxial film growth study of single crystal V/Ce prepared by molecular-beam epitaxy on sapphire

Description: The growth of epitaxial films of cerium (Ce)/vanadium (V)/on single crystal sapphires (..cap alpha..-Al/sub 2/O/sub 3/) was studied by in-situ reflection high energy electron diffraction and x-ray scattering. For the first time Ce(111) single crystal films was grown on V(110)/Al/sub 2/O/sub 3/(1120) in the Frank-van der Merwe mode. A new epitaxial orientation, different from the well known Nishiyama-Wasserman or Kurdjumov-Sachs orientations is found in the present study. Subsequent V(110) layer… more
Date: November 1, 1986
Creator: Homma, Hitoshi; Yang, Kai-Y. & Schuller, Ivan K.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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