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in subjects: "Niobium Compounds"  
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A study of electro-optical modulators for transfer of detector signals by optical fibers

Description: Preliminary results of an investigation to minimize the local electronics on the detector by the use of electro-optical intensity modulators are reported. The electrical signal from the detector is converted into an optical signal by a Mach-Zehnder interferometer modulator based on the properties of electro-optical crystals such as LiNbO{sub 3}. The modulator is driven by the electrical signal from a detector element such as the gas proportional straw tube. The optical signal is brought in from… more
Date: October 1, 1990
Creator: Tsang, T.; Radeka, V.; Srinivasan-Rao, T. (Brookhaven National Lab., Upton, NY (USA)) & Willis, W.J. (Brookhaven National Lab., Upton, NY (USA) Columbia Univ., New York, NY (USA))
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Structural studies of the metal-rich region in the ternary Ta-Nb-S system

Description: Six new solid solution type compounds have been prepared using high temperature techniques and characterized by means of single crystal x-ray techniques during a study of the metal-rich region of the ternary Ta-Nb-S system. The structures of Nb{sub x}Ta{sub 11-x}S{sub 4} are reminiscent of niobium-rich sulfides, rather than of tantalum-rich sulfides. The coordinations of sulfur are capped trigonal prismatic while the metal coordinations are capped distorted cubic prismatic for Nb{sub x}Ta{sub 1… more
Date: October 7, 1991
Creator: Yao, Xiaoqiang.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Development of a new family of cemented carbides for geothermal drilling. Final report

Description: The contractor fabricated samples of cemented carbides based on tantalum carbide and niobium carbide with cobalt and nickel binders. These materials were evaluated for use as rock-bit inserts in geothermal drilling. Carbon content in the niobium carbide (NbC/sub x/) and the tantalum carbide (TaC/sub x/) was varied (x is 0.83 to 1.0) and the effect of these changes on the carbides' mechanical properties was examined. Hardness, toughness, and abrasive wear resistance of the new materials were mea… more
Date: October 1, 1983
Creator: Rowcliffe, David J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Thermal conductivity of niobium diselenide

Description: Thermal conductivity measurements have been used to study the temperature dependence of the various scattering mechanisms present in single crystals of NbSe in a temperature range from 1 to 10/sup 0/K. Phonons are found to contribute a substantial fraction of the conduction in this temperature range and, in general, the results agree well with standard theoretical models for three-dimensional metals. The presence of van der Waals boundaries beween the layers introduces no significant boundary s… more
Date: October 1, 1976
Creator: Roeske, F. Jr.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Obstacle-induced hardening and softening in metallic materials. Technical progress report, February 1, 1976--January 31, 1977

Description: During the past contract year, new results have been obtained in two on-going project areas: (1) surface oxide softening and solute gradients in niobium and tantalum, and (2) mechanical properties of Nb-H, Nb-D, and Nb-O-H alloys. The important results include: (a) characterization of the large softening and ductilizing effect of niobium and tantalum caused by thin (50-100 nm) surface oxide films; (b) determination of the role of interstitial impurities in the strengthening and ductility change… more
Date: October 31, 1976
Creator: Gibala, R.; Sethi, V. K. & Fournier, R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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