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in subjects: "Rubidium Compounds"

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Spin dynamics on percolating networks

We have used inelastic neutron scattering to measure the order parameter relaxation rate GAMMA in the dilute, two-dimensional Ising antiferromagnet Rb/sub 2/CoMg/sub 1-c/F/sub 4/ with c very close to the magnetic percolation threshold. Where kappa is the inverse magnetic correlation length, GAMMA approx. kappa/sup z/ with z = 2.4/sub -0.1//sup +0.2/. Our results are discussed in terms of current ideas about spin relaxation on fractals. 13 refs., 1 fig.

Date: January 1, 1985

Creator: Aeppli, G.; Guggenheim, H. & Uemura, Y.J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Electrochemical photovoltaic cells. Project 65021 quarterly technical progress report, July 15-October 15, 1979

During the second quarter of this program we have evaluated the photoelectrochemical performance of single-crystal MoSe/sub 2/ and GaAs, polycrystalline CdSe, and cells with RbAg/sub 4/I/sub 5/ solid electrolyte. MoSe/sub 2/ electrode exhibited very good photoresponse in electrolytes containing Br/sup -//Br/sub 2/ redox couple. The photopotential and photocurrent were larger in acid than in alkaline electrolyte. A power conversion efficiency of about 5% was achieved under 200 mW/cm/sup 2/ Xenon… more

Date: October 1, 1979

Creator: Ang, P.G.P. & Sammells, A.F.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Neutron scattering study of the solid electrolyte: RbAg/sub 4/I/sub 5/

Neutron scattering experiments were performed on RbAg/sub 4/I/sub 5/ in order to probe: (1) The lattice dynamics above and below the phase transition at T/sub 2/ = 208.5 K; (2) The temperature dependence of the Ag/sup +/ occupancies below T/sub 2/; and (3) The diffusion of the Ag/sup +/ ions. No anomalous softening of the elastic constant C/sub 44/ was observed as had been reported by ultrasonic studies. Careful examination of the phonon intensities above and below T/sub 2/ suggest that the tra… more

Date: January 1, 1977

Creator: Shapiro, S.M.; Semmingsen, D. & Salamon, M.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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(Vibrational and electronic properties of clusters and ultrathin films: Annual progress report)

Two areas have been focused on in the current period: clusters of Bi grown on surfaces and materials formed from buckyball (C60) clusters.

Date: January 1, 1991

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Physical properties of superconducting and ferromagnetic materials based on C sub 60

We present results of magnetization and pressure measurements on recently discovered superconductors K{sub 3}C{sub 60} and Rb{sub 3}C{sub 60}, as well as ferromagnetic C{sub 60} TDAE, and discuss the nature of the ground state suggested by these studies.

Date: December 1, 1991

Creator: Thompson, J. D.; Sparn, G. (Los Alamos National Lab., NM (United States)); Diederich, F.; Gruener, G.; Holczer, K.; Kaner, R. B. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Laser materials: July 1, 1977-July 31, 1978

Fluoride materials display specific properties applicable for use as active and passive optical elements for advanced laser programs. Generally, these materials exhibit low values of n/sub 2/ and high ultraviolet transmission. Nd:YLF is a very promising laser fusion oscillator element operating in conjunction with phosphate and fluoroberyllate systems. New materials possessing high concentrations of terbium and cerium - KTb/sub 3/F/sub 10/, RbTb/sub 3/F/sub 10/ and potassium cerium compounds, d… more

Date: August 8, 1979

Creator: Folweiler, R. C.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Ionic alkali halide XUV laser feasibility study

The objective of this work is to assess the feasibility of a select set of ionic alkali halide XUV laser concepts by obtaining the relevant kinetic and spectroscopic parameters required for a proof-of-principle and conceptual design. The proposed lasers operate in the 80--200 nm spectral region and do not require input from outside radiation sources for their operation. Frequency up-conversion and frequency mixing techniques and therefore not considered in the work to be described. An experimen… more

Date: November 10, 1989

Creator: Yang, T. T.; Gylys, V. T.; Bower, R. D.; Harris, D. G.; Blauer, J. A.; Turner, C. E. et al.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Single particle excitations in RbAg/sub 4/I/sub 5/

In an inelastic neutron experiment on RbAg/sub 4/I/sub 5/ a broad quasielastic peak was observed throughout Q-space. As the temperature was lowered, the quasielastic peak became a broad propagating excitation with dirac constant ..omega.. approx. 2.2 meV. This excitation was measured along several symmetry directions and it exhibited little dispersion. This confirms that the original idea of a single particle excitation corresponding to the Ag/sup +/ ions moving within a potential well created … more

Date: January 1, 1979

Creator: Shapiro, S.M. & Salamon, M.B.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Preparation and Moessbauer spectra of Np(III): alkali metal chlorocompounds

M/sub 2/NpCl/sub 5/, MNp/sub 2/Cl/sub 7/ (M = K, NH/sub 4/, Rb) and NpCl/sub 3/ 4CH/sub 3/CN were prepared by zinc amalgam reduction of NpCl/sub 4/-MCl in 50:1 acetonitrile-propionic acid solutions. The /sup 237/Np Moessbauer spectra of these compounds showed quadrupole interactions, with Moessbauer parameters delta = 3.4 to 3.5 cm/sec and 1/4eqQ = 0.5 to 0.7 cm/sec. Moessbauer spectra established that preparations analyzing as MNpCl/sub 4/ CH/sub 3/CN were mixtures of M/sub 2/NpCl/sub 5/ and N… more

Date: January 1, 1979

Creator: Karraker, D.G. & Stone, J.A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Investigation of the potential of silica-bonded macrocyclic ligands for separation of metal ions from nuclear waste. [Macrocyclic ligands covalently bonded to silica gel]

This report describes the testing of some novel separations materials known as SuperLig{trademark} materials for their ability to separate efficiently and selectively certain metal ions from a synthetic, nonradioactive nuclear waste solution. The materials, developed and patented by IBC Advanced Technologies, are highly selective macrocyclic ligands that have been covalently bonded to silica gel. The SuperLig{trademark} materials that were tested are: (1) SuperLig{trademark} 601 for barium (Ba{… more

Date: January 1, 1992

Creator: Camaioni, D.M.; Colton, N.G. (Pacific Northwest Lab., Richland, WA (United States)) & Bruening, R.L. (IBC Advanced Technologies, Inc., Provo, UT (United States))

Item Type: Report

Partner: UNT Libraries Government Documents Department

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X-Ray and [Gamma]-Ray Spectroscopy of Solids Under Pressure

The following studies are described that were either completed during this 3-year period or are well underway: XAFS study of pressure-induced transition in Rb-W bronze (Rb[sub 0.31]WO[sub 3]); XAFS study of bcc-hcp transition in Fe; XAFS search for valence change in thallium perhenate (TlReO[sub 4]) at high pressure; XANES analysis of alkali halides; pair potentials in alkali halides studied via EXAFS; EXAFS determination of bond angles in ReO[sub 3]; XAFS study of mixed-valence transition in S… more

Date: April 30, 1993

Creator: Ingalls, R.L.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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X-Ray and [Gamma]-Ray Spectroscopy of Solids Under Pressure

The effort is divided into the following: high pressure transitions (Fe, RbCl), XAFS studies of perovskites under pressure (ReO[sub 3], high-[Tc] superconductors), studies of XANES of alkali halides, and Moessbauer studies (iron silicate spinel).

Date: April 30, 1992

Creator: Ingalls, R.L.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Low-density, salt-loaded foams. [RbF]

An experiment was conducted at LLL that required low-density, fine-celled foams uniformly loaded with rubidium. Foams meeting these requirements were produced by impregnating foams made from polyacrylonitrile with rubidium fluoride. Foams with densities from 0.025 to 0.4 g/cm/sup 3/ were prepared and loaded with 0.002 to 0.20 g/cm/sup 3/ of rubidium fluoride.

Date: January 10, 1979

Creator: Rinde, J.A.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Molecular potentials and relaxation dynamics

The use of empirical pseudopotentials, in evaluating interatomic potentials, provides an inexpensive and convenient method for obtaining highly accurate potential curves and permits the modeling of core-valence correlation, and the inclusion of relativistic effects when these are significant. As an example, recent calculations of the chi/sup 1/..sigma../sup +/ and a/sup 3/..sigma../sup +/ states of LiH, NaH, KH, RbH, and CsH and the chi/sup 2/..sigma../sup +/ states of their anions are discusse… more

Date: March 27, 1981

Creator: Karo, A.M.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Molecular potentials and relaxation dynamics

The use of empirical pseudopotentials, in evaluating interatomic potentials, provides an inexpensive and convenient method for obtaining highly accurate potential curves and permits the modeling of core-valence correlation, and the inclusion of relativistic effects when these are significant. Recent calculations of the X/sup 1/..sigma../sup +/ and a/sup 3/..sigma../sup +/ states of LiH, NaH, KH, RbH, and CsH and the X/sup 2/..sigma../sup +/ states of their anions are discussed. Pseudopotentials… more

Date: May 18, 1981

Creator: Karo, A.M.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Dynamics of random spin systems

We present inelastic neutron scattering experiments on three prototypical random magnets. For the dilute, insulating antiferromagnet Rb/sub 2/Co/sub c/Mg/sub 1-c/F/sub 4/, the randomness has purely geometrical consequences, and the anomalous dynamical behavior which we observe for c close to the magnetic percolation threshold is due to the fractal nature of percolating networks. Comparison of inelastic and quasielastic scattering data demonstrate the dynamical nature of the spin glass transitio… more

Date: January 1, 1985

Creator: Aeppli, G.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Development of rubidium and niobium containing plastic foams. Final report

Rubidium fluoride and niobium metal-containing foam samples (rods and sheets) were prepared using two foam sytems: (1) hydrophilic polyurethanes prepared from W.R. Grace Co.'s Hypol prepolymers and (2) polyimides prepared from Monsanto Company's Skybond polyimide resin. The first system was used only for preparation of rubidium fluoride-containing foams while the second was used for both rubidium fluoride and niobium-containing foams. The niobium metal could readily be incorporated into the pol… more

Date: July 26, 1978

Creator: Botham, R.A.; McClung, C.E. & Schwendeman, J.I.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Role of Structure in Ion Movement of Glasses Progress Report

Three kinds of experiments were performed: modified random network model and ion movement; role of melt structure in ion transport in glassy state; and ion movement in fluorozirconate glass (breakdown of correspondence between electrical and nuclear spin relaxation). A comment is offered on dielectric loss peak in glasses. 11 refs, 1 fig. (DLC)

Date: November 3, 1992

Creator: Jain, Himanshu

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Investigation of the potential of silica-bonded macrocyclic ligands for separation of metal ions from nuclear waste

Date: January 1, 1992

Creator: Camaioni, D. M.; Colton, N. G. & Bruening, R. L.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Cesium iodide alloys

This invention relates to a CsI composition with improved mechanical strength and outstanding multispectral infrared transmittance, for window use. The additive is a monovalent iodide, other than CsI, added in amounts sufficient to maximize fracture strength from 16 to 40 MPa, while maintaining at least 10% transparency in the 4 to 50 micrometer wavelength range. The preferred additive is AgI, although RbI or CuI can be used. 6 figs. (DLC)

Date: January 1, 1991

Creator: Kim, Hyoun-Ee & Moorhead, A. J.

Item Type: Patent

Partner: UNT Libraries Government Documents Department

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Study of KLL Auger processes for light elements above Z = 10. [Review]

A comprehensive review is given of the KLL Auger spectrum for members of the third row of the periodic table. This group contains the lightest elements wherein an Auger process can occur without the direct participation of the valence shell. Recent Auger spectra induced by x-ray photoionization on Mg, Al, and Si metals and their oxides are given as well as preliminary results on salts of Na and K, and for comparison, the LMM spectra of RbCl. Results were combined with previous experimental data… more

Date: January 1, 1977

Creator: Carlson, T. A.; Dress, W. B. & Nyberg, G. L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Theory and measurement of x-ray diffraction from several acid phthalates

Calculated and average measured values of the single crystal coefficient (R/sub c/) at characteristic line wavelengths are given for KAP, RbAP, TlAP, NaAP, and NH/sub 4/AP. RbAP, because it has twice the reflectivity of AP and nearly equal resolving power, should replace KAP as a standard for general spectroscopy. For quantitative analysis where reflectivity is most important TlAP is far superior at all useful wavelengths. Both RbAP and TlAP have good ratios of first to all higher order reflect… more

Date: January 1, 1976

Creator: Barrus, D. M.; Blake, R. L. & Burek, A. J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Solid State Division annual progress report for period ending December 31, 1975

Research activities are reported in programs on theoretical solid state physics, physical properties of solids, radiation effects in metals, neutron scattering, research materials, and isotope research materials. (JRD)

Date: May 1, 1976

Creator: Wilkinson, M. K. & Young, F. W. Jr.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Optical properties of lanthanide-doped RbTiOAsO{sub 4} and transition metal-doped KTiOPO{sub 4}

We have synthesized derivatives of potassium titanyl phosphate (KTP) and rubidium titanyl (RTA) where Ti has been replaced by transition metal or lanthanide ions, and K, Ti, P or O has laced by aliovalent counterions. Up to 5 mol % lanthanide ion can be substituted onto the Ti and 100 mol % substitution of other transition metals onto the Ti sites in KTP can be made. The visible spectra of these doped KTP phases are characteristic of the dopant ions, with sharp, narrow transitions resulting fro… more

Date: December 31, 1993

Creator: Phillips, M. L. F.; Anderson, M. T. & Sinclair, M. B.

Item Type: Article

Partner: UNT Libraries Government Documents Department