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mu. /sup +/SR in amorphous spin glasses Pd/sub 75/Fe/sub 5/Si/sub 20/ and Pd/sub 75/Fe/sub 5/P/sub 5/

Description: The zero-field muon spin relaxation function G/sub zz/(t) has been measured as a function of reduced temperature t = T/T/sug g/ in the amorphous metallic spin glasses Pd/sub 75/Fe/sub 5/Si/sub 20/ and Pd/sub 75/Fe/sub 5/P/sub 20/. The results are in qualitative agreement with earlier measurements on dilute alloy spin glasses, including an onset of static order below T/sub g/ and a (t/(t - 1))/sup 2/ dependence of the correlation time tau/sub c/ above T/sub g/. Both samples have the same tau/sub… more
Date: January 1, 1986
Creator: Brewer, J. H.; Spencer, D. P.; Huang, C. Y.; Uemura, Y. J. & Chen, H. S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Platinum particles in the Nd:doped disks of phosphate glass in the Nova laser

Description: The disks of Nd:doped phosphate glass in the amplifiers of the Nova laser contain platinum particles with sizes ranging from <5 ..mu..m (detection limit) to about 100 ..mu..m. The particle density varies from about 0.01 to 1.0 cm/sup -3/. These particles cause fractures when irradiated at fluences >2.5 J/cm/sup 2/ delivered in 1-ns, 1054-nm pulses. Under repeated irradiation at 5 to 7 J/cm/sup 2/, damage from small (<5 ..mu..m) particles asymptotically approaches a limiting size, but damage sur… more
Date: February 20, 1986
Creator: Milam, D.; Hatcher, C. W. & Campbell, J. H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Structure and activity of Pt-Co alloys as oxygen reduction electrocatalysts

Description: Carbon supported Pt-Co (3:1 atom ratio) catalysts were prepared in both acid and alkaline aqueous media, followed by heat treatments to promote alloy formation. Both preparations began with a commercial 10% Pt on carbon catalyst with Pt particle sizes of 15 to 30 A. Significantly greater alloying was observed in the acid media prepared catalyst. X-ray diffraction studies of the acid prepared catalyst demonstrated lattice parameters tending away from Pt (3.937 A) and toward that for Pt/sub 3/Co … more
Date: March 1, 1986
Creator: Beard, B. C. & Ross, P. N., Jr.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Antiferromagnetic spin fluctuations and the heavy fermion system UPt/sub 3/

Description: We review the results of inelastic polarized and unpolarized magnetic neutron scattering measurements on the heavy fermion superconductor UPt/sub 3/. Below T/sub chi/ = 18K, we find evidence for antiferromagnetic spin fluctuations with a modulation vector along the c-axis of the hexagonal lattice. This contradicts the analogy often made between UPt/sub 3/ and liquid /sup 3/He, and may have important consequences for the pairing mechanism responsible for superconductivity in this system.
Date: January 1, 1986
Creator: Goldman, A. I.; Shirane, G.; Aeppli, G.; Bucher, E. & Hufnagl, J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Understanding Photoemission Spectra in Uranium Based Heavy Fermion Systems

Description: In 4f compounds, there is a two-peaked structure associated with 4f photoemission spectroscopy, while most 5f compounds yield a single broad triangular-shaped 5f intensity. Evidence is presented from measurements on ternary alloys that show that at least part of the extra-5f intensity is due to the hitherto missing main peak (or d-screened f-hole peak) just as in the 4f systems. The remaining intensity is consistent with a band structure DOS. (The compounds used were URh/sub 3/B/sub x/, UPd/sub… more
Date: December 1986
Creator: Arko, A. J.; Yates, B. W.; Dunlap, B. D.; Koelling, D. D.; Mitchell, A. W.; Lam, D. J. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Ultrasonic detection of laminar-type defects in iridium alloy blanks

Description: Encapsulated isotopic heat sources for use in generating electrical power for space applications require flight-quality hardware material. Iridium is the chosen material for such applications, and Oak Ridge National Laboratory has been the prime supplier of iridium alloy forming blanks 52 mm in diameter by 0.66 mm thick (1.0 by 0.026 in.). Prior to the work reported here, these blanks were ultrasonically examined by using 0.9-mm-diam (0.035-in.) simulated flaw standards. However, as a result of… more
Date: July 1, 1986
Creator: Cook, K. V.; Cunningham, Jr., R. A.; Simpson, W. A., Jr. & McClung, R. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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