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High-temperature compatibility study of iridium (DOP-26 alloy) with graphite and plutonia

Description: This report outlines the materials compatibility tests conducted on DOP-26 iridium alloy and carbon. The carbon used was in the form of woven graphite as present in the impact shell used to encase plutonia in nuclear heat sources. In addition, compatibility tests of the DOP-26 alloy with plutonia are described. The reactivity observed in both systems is discussed. 4 refs., 6 figs.
Date: December 1, 1987
Creator: Axler, K.M. & Eash, D.T.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Positron-annihilation 2D-ACAR studies of disordered and defected alloys

Description: Theoretical and experimental progess in connection with 2D-ACAR positron annihilation studies of ordered, disordered, and defected alloys is discussed. We present, in particular, some of the recent developments concerning the electronic structure of disordered alloys, and the work in the area of annihilation from positrons trapped at vacancy-type defects in metals and alloys. The electronic structure and properties of a number of compounds are also discussed briefly; we comment specifically on … more
Date: September 1, 1987
Creator: Bansil, A.; Prasad, R.; Smedskjaer, L. C.; Benedek, R. & Mijnarends, P. E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Formation of Metastable Structures and Amorphous Phases in Pu-Based Systems Using the Triode Sputtering Technique

Description: The triode sputtering technique has been used to obtain metastable crystalline and amorphous phases in ten binary systems of Pu with Si, Al, V, Fe, Co, Pd, Ta, Re, Os, and Ir. The lattice parameters and near-neighbor distances evaluated with x-ray diffraction frequently show deviations from an assumed Vegard's Law which can be interpreted in relation to the changing electronic configuration and corresponding size of the Pu atom. When the Egami and Waseda criterion is applied to predict the poss… more
Date: January 1, 1987
Creator: Rizzo, H. F.; Echeverria, A. W.; Wien, W. L. & Massalski, T. B.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Results of tritium experiments on ceramic electrolysis cells and palladium diffusers for application to fusion reactor fuel cleanup systems

Description: Tritium tests at the Tritium Systems Test Assembly have demonstrated that ceramic electrolysis cells and palladium alloy diffuser developed in Japan are possible components for a fusion reactor fuel cleanup system. Both components have been successfully operated with tritium for over a year. A failure of the first electrolysis cell was most likely the result of an over voltage on the ceramic. A simple circuit was developed to eliminate this mode of failure. The palladium diffusers tubes exhibit… more
Date: 1987~
Creator: Carlson, R.V.; Binning, K.E.; Konishi, S.; Yoshida, H. & Naruse, Y.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Cu/sub 3/Pd observed by high-voltage electron microscopy

Description: Cu-Pd samples of compositions varying from 16 to 26 at.% Pd were irradiated in situ in a 1.5-MeV electron microscope at various temperatures. Low-temperature (90/sup 0/K) irradiation produced completely disordered solid solutions. Irradiation at room temperature up to as high as about 500/sup 0/K produced steady state short range order (SRO) which, for specimens of 18% or more Pd, is characterized by diffuse intensity at (1 +-q,0) and equivalent positions in reciprocal space (modulated SRO). In… more
Date: July 1, 1987
Creator: Kulik, J.; Takeda, S. & de Fontaine, D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Lattice instabilities in heavy fermion superconductors. [CeCu/sub 2/Si/sub 2/; CeAl/sub 3/; CeCu/sub 6/; UBe/sub 13/; UPt/sub 3/]

Description: This paper shows that while in nonsuperconducting HF systems such as CeCu/sub 6/, CeAl/sub 3/ and stoichiometric CeCu/sub 2/Si/sub 2/, the large electronic ..gamma.. is due to a very narrow f band, in the three HF superconductors UBe/sub 13/, UPt/sub 3/ and nonstochiometric CeCu/sub 2/Si/sub 2/, it is not. The f band of these systems, as measured by their response to magnetic fields in three different ways, is much wider than suggested by the large ..gamma... According to their actual f band wi… more
Date: January 1, 1987
Creator: Wohlleben, D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Evolution with pressure of a heavy mass ground state in chemically expanded CeRu/sub 2/Si/sub 2/

Description: The substitution of Ge for Si in CeRu/sub 2/Si/sub 2/ at first enhances the electronic specific heat ..gamma.. of this heavy electron compound. Such enhancement has been found in other heavy electron systems (e.g., UBe/sub 13/)/sup 7/ when small amounts of non-magnetic impurities are added to the host. For increasing Ge concentrations, the system evolves out of the heavy mass state into a magnetically ordered ground state. It seems likely that this development results from competing Kondo and R… more
Date: January 1, 1987
Creator: Borges, H. A.; Thompson, J. D.; Godart, C. & Gupta, L. C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Pressure dependence of the specific heat of heavy-fermion compounds. [CeAl/sub 3/; CeCu/sub 6/; UBe/sub 13/; UPt/sub 3/]

Description: Although the electrical resistivity and the magnetic susceptibility of a number of HFC have been measured as a function of pressure, it is only recently that data for the specific heat (C) have become available for non-zero pressure. This paper describes measurements of C(P) to P approx.9 kbar for CeAl/sub 3/, CeCu/sub 6/, UBe/sub 13/, and UPt/sub 3/. 33 refs., 11 figs.
Date: January 1, 1987
Creator: Phillips, N. E.; Fisher, R. A.; Lacy, S. E.; Marcenat, C.; Olsen, J. A.; Flouquet, J. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Coherence in CePd/sub 3/

Description: This paper presents results of resistivity and susceptibility measurements on CePd/sub 3/ and its alloys which support the existence of a third significant temperature, T* = 40K. Anomalous pressure dependence of rho(T) occurs and nonmagnetic impurities cause large increases in rho(T) on this scale, which is distinct from and smaller than the scale T/sub max/ over which coherence first appears. Evidence is given that the magnetic form factor anomaly known to exist in CePd/sub 3/ arises on the sa… more
Date: January 1, 1987
Creator: Lawrence, J. M.; Chen, Y. Y. & Thompson, J. D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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f-band narrowing in uranium intermetallics

Description: Although the discovery of heavy fermion behavior in uranium compounds has attracted a great deal of attention, relatively little work has been done which is sufficiently systematic to allow an assessment of the relationship of such behavior to more common phenomena, such as mixed valence, narrow-band effects, etc. In this paper we report bulk property measurements for a number of alloys which form a part of such a systematic study. The approach has been to take relatively simple and well-unders… more
Date: January 1, 1987
Creator: Dunlap, B. D.; Litterst, F. J.; Malik, S. K.; Kierstead, H. A.; Crabtree, G. W.; Kwok, W. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Response of Kondo lattice systems to pressure. [YbAgCu/sub 4/; YbCu/sub 2/Si/sub 2/; YbRh/sub 2/Si/sub 2/]

Description: Yb-based Kondo lattice systems (YbAgCu/sub 4/, YbCu/sub 2/Si/sub 2/, YbRh/sub 2/Si/sub 2/) represent an interesting class of materials in which it is possible to study systematically the development of heavy electron behavior through the application of pressure. Certainly, additional experiments are required to determine to what extent Yb compounds are mirror images of their Ce counterparts. Finally, pressure reveals the presence of competing interactions for which a simple model exists that qu… more
Date: January 1, 1987
Creator: Thompson, J. D.; Borges, H. A.; Fisk, Z.; Horn, S.; Parks, R. D. & Wells, G. L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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