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- W2017753543 abstract "which were annealed and quenched were analyzed with the electron probe to determrine the limits of solid solubility at the two ends of the binary system. The maximum solubility of Ce in epsilon Pu is 16 at.% at 626 deg C. Delta Pu forms by peritectoid reaction at 613 deg C. Ce is soluble in delta Pu to about 23 at.% Ce at this temperature and decreases to 17.5 at.% at room temperature. The maximum solid solubility of Pu fn gamma Ce is 34.5 at.% Pu at 626 deg C decreasing to less than 10 at.% at room temperature. The solubility of Pu in delta Ce is 19.5 at.%. Quenching studies showed no evidence of recurrent melting in the region from 75 to 85 at.% Ce. The viscosity of a Pu-- 1 at.% Fe alloy decreased with increasing temrperature from 6.5 centipoise at its melting point (628 deg C) to 4.3 centipoise at 905 deg C. The 1 at.% (0.234 wt%) Fe addition to the pure Pu metal raised its viscosity an average of 5% the measured temperature interval. Electromotive force measurements are being conducted on liquid metal alloys so that an apparatus can be developed for the determination of the same thermodymanic properties for Pu alloys. Electromotive force measurements were conducted on a series of Cd--Bi alloys at 500 deg C using fused salt bridges. The heat capacity of a Pu-- Ce- Co eutectic alloy was measured at a 100 to 600 deg C. Since the melting point of the alloy was 424 deg C, several measurements were made in the liquid range. The heat capacity values increased almost limearly with temperature from 5.8 to 11.0 calories per mole per deg C. No abrupt change in the heat capacity was noted at the melting point. The heat required to melt the alloy at the melting point was determined to be 1630 plus or minus 20 calories per role. The feasibility of producing PuO/sub 2/-- ThO/sub 2/ solid solutions by plasma torch techniques was demonstrated. The spheroidized product, composed of equal parts of the two oxides, ranged in diameter from 10 to 150 microns. The transparent yellow microspheres were shown by x-ray-diffraction to be a single-phase solid solution. A cubic crystal of PuO/sub 2/ formed in a melt of PuO/sub 2/ dissolved in silicate glass. The crystal was trapped in a glass fiber drawn from the melt and was examined by crystal x-ray analysis. The analysis showed a nearly perfect face-centered cubic single crystal with a lattice parameter a = 5.397 A. Precise lattice parameters of the crystal and the x-ray scattering factors for Pu are being obtained. ZrO/sub 2/ is being studied as a nonfissile diluent for PuO/sub 2/ in potential reactor fuels. The ZrO/sub 2/ microspheres, produced as powder is passed through the induction-coupled plasma torch, are being characterized by x-ray-diffraction techniques. Diffraction photographs of microspheres which had been ground to a powder revealed that the product was the monoclinic form of ZrO/ sub 2/, which is the stable form below 1100 deg C. Single crystal analysis of one microsphere, however, revealed a tetragonal lattice with parameters of a = 3.64 A and c = 5.24 A. The tetragomal form of ZrO/sub 2/ with which this form compares in lattice parameters, is stable only above 1000 deg C. A method was developed for determining microgram quantities of Ni im Pu alloys. Ni was extracted as nickel dimethylglyoxime. Interference was investigated in this spectrophotometric method. The pH of the solution was raised to 10.0 prior to color development in order to stabilize the complex for a period long enough" @default.
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- W2017753543 date "1964-06-30" @default.
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- W2017753543 title "REACTOR FUELS AND MATERIALS DEVELOPMENT PLUTONIUM RESEARCH--APRIL-JUNE 1964" @default.
- W2017753543 doi "https://doi.org/10.2172/4636226" @default.
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