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Spectrographic Determination of Impurities in Hafnium

Description: A spectrographic method using d-c arc excitation in a controlled atmosphere was developed to analyze for seven impurity elements in radioactive hafnium samples. Analysis requires as little as 35 mg of hafnium oxide. (auth)
Date: August 25, 1961
Creator: Ginther, B. E. & Wheeler, G. V.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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K-isomers in Hf nuclei at and beyond the neutron-rich edge of {beta}-stability.

Description: New high-K isomers are populated in {sup 180,181,182}Hf nuclei via inelastic excitation and transfer reactions, using pulsed {sup 238}U beams on Hf targets. The new data explore K-hindrances for different multipolarities and the role of residual spin-spin interactions for multi-quasiparticle (qp) configurations at the neutron-rich edge of the {beta}-stability line. The mapping of 4-qp K-isomers in the A {approx} 180 region is extended into neutron-rich territory.
Date: March 30, 1999
Creator: Chowdhury, P.; Alarcao, R. D.; Seabury, E. H.; Walker, P. M.; Wheldon, C.; I., Ahmad. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Extraction of short-lived zirconium and hafnium isotopes usingcrown ethers: A model system for the study of rutherfordium

Description: The extraction of zirconium and hafnium from hydrochloric acid media was studied using the crown ethers dibenzo-18-crown-6 (DB18C6), dicyclohexano-18-crown-6 (DC18C6) and dicyclohexano-24-crown-8 (DC24C8) as extractants. The goal was to find an extraction system that exhibits a high selectivity between the members of group 4 of the periodic table and is suitable for the study of rutherfordium. It was found that Zr and Hf are both extracted using DB18C6, DC18C6 and DC24C8. The extraction yield i… more
Date: July 6, 2005
Creator: Sudowe, Ralf; Calvert, Michael G.; Dullmann, Christoph E.; Farina, Lindsy M.; Folden, Charles M., III; Gregorich, Kenneth E. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Neutron activation cross sections for copper, europium, hafnium, iron, nickel, silver, terbium and titanium from the Argonne, Los Alamos and Jaeri collaboration

Description: Several fast-neutron activation reactions for copper, europium, hafnium, iron, nickel, silver, terbium and titanium that are important to fusion energy have been investigated in three distinct neutron fields generated by accelerators at Argonne National Laboratory and Los Alamos National Laboratory, USA, and Japan Atomic Energy Research Institute, Tokai, Japan. Final differential cross-sections at 14.7 MeV and integral cross sections for the Be(d,n) thick-target spectrum produced by 7-MeV deutr… more
Date: July 1, 1995
Creator: Meadows, J. W.; Smith, D. L.; Greenwood, L. R.; Haight, R. C.; Ideda, Y. & Konno, C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Zirconium Metal Fines Recovery: Interim Technical Report for May 15, 1950 to December 15, 1950

Description: This report covers the laboratory and pilot plant investigation of the reclamation of the low hafnium zirconium fines resulting from the manufacture of zirconium sponge and zirconium crystal bar. The process investigated involved recovery of the zirconium as zirconium tetrachloride, by drying the fines in an atmosphere of nitrogen and subsequent chlorination of the fines with anhydrous hydrogen chloride at temperatures above the sublimation point of the product.
Date: January 24, 1951
Creator: Ogburn, S. C., Jr. & Reader, L. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The Nuclide Hf182

Description: The nuclide Hf182 has been made by thermal-neutron irradiation of hafnium oxide and has been found to have a half-life of 8.5 x 10(6) years. A preliminary study ha been made of possible radiations associated with the nuclide.
Date: September 28, 1960
Creator: Hutchin, W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Carbon reduction in uranium alloys utilizing hafnium additions

Description: With increasing environmental concerns regarding the handling and storage of uranium waste, recycling previously used material is becoming exceedingly more important. Carbon is one of the primary trace impurities that builds up in uranium with repeated use. The goal of this study is to reduce carbon in recycled uranium during the casting process to carbon levels associated with virgin uranium derbies. Vacuum-induction casting experiments have demonstrated that hafnium (Hf) additions to unalloye… more
Date: August 14, 1990
Creator: Mackiewicz-Ludtka, G.; Pullen, W. C.; Henderson, C. A. (Oak Ridge Y-12 Plant, TN (USA)); Chu, W. & Wendel, M. W. (Oak Ridge Gaseous Diffusion Plant, TN (USA))
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Data on the Hafnium Dioxide Content and the Ratio of Hafnium to Zirconium in Minerals and Rocks

Description: Abstract: "All published data on the hafnium content and hafnium/zirconium ratio in minerals and rocks have been compiled." Information regarding hafnium and zirconium content and the ratio Hf/Zr in the earth's crust and in rocks as well as of minerals is included.
Date: March 1954
Creator: Fleischer, Michael
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Ductile nickel-silicon alloy

Description: An improvement over prior compositions wherein the ductility of Ni-Si alloys are improved with minor alloying additions of hafnium or zirconium.
Date: August 6, 1990
Creator: Oliver, W. C.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
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Determination of Hafnium and Rare Earths in Aluminum Alloys

Description: Procedures are described for both a titrimetric and a gravimetric determination of hafnium in aluminum -hafnium alloys. The gravimetric procedure is used if the hafnium is to be recovered; otherwise, the titrimetric procedure is preferred. The sample is dissolved in aqua regia. Any undissolved hafnium is taken into solution via pyrosulfate fusion. The hafnium is separated from the aluminum and contaminants in the aluminum by precipitation as the mandelate. In the gravimetric procedure the hafni… more
Date: January 1, 1959
Creator: Sikes, J. H.; Wade, M. A. & Yamamura, S. S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Ductile nickel-silicon alloy

Description: An improvement over prior compositions wherein the ductility of Ni-Si alloys are improved with minor alloying additions of hafnium or zirconium.
Date: August 6, 1990
Creator: Oliver, W. C.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
open access

Hafnium Resonance Parameter Analysis Using Neutron Capture and Transmission Experiments

Description: The focus of this work is to determine the resonance parameters for stable hafnium isotopes in the 0.005 - 200 eV region, with special emphasis on the overlapping {sup 176}Hf and {sup 178}Hf resonances near 8 eV. Accurate hafnium cross sections and resonance parameters are needed in order to quantify the effects of hafnium found in zirconium, a metal commonly used in reactors. The accuracy of the cross sections and the corresponding resonance parameters used in current nuclear analysis tools ar… more
Date: February 6, 2007
Creator: Trbovich, M J; Barry, D P; Slovacek, R E; Danon, Y; Block, R C; Francis, N C et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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