49 research outputs found
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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 NpCl/sub 3/ 4CH/sub 3/CN
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Covalency of neptunium(IV) triscyclopentadienyl compounds from Moessbauer spectra
Isomer shifts measured from the /sup 237/Np Moessbauer spectra of NpCp/sub 3/OR (R = alkyl) NpCp/sub 3/R and NpCpAr (Ar = aryl) are used as a measure of the covalency in Np(IV) ligand bonding. The isomer shifts in NpCp/sub 3//sup n/Bu and NpCp/sub 3/C/sub 6/H/sub 4/C/sub 2/H/sub 5/ show a strong sigma character to the Np--/sup -n/Bu and Np--C/sub 6/H/sub 4/C/sub 2/H/sub 5/ bonds. The sigma character of Np--OR bonding is definite, but less pronounced. The comparatively low covalency in the bonding of NpCp/sub 4/ is ascribed to longer Np--C bonds in NpCp/sub 4/ than in NpCp/sub 3//sup +/ compounds. The /sup 237/Np isomer shift in Np(MeCp)Cl/sub 3/.2THF indicates that the MeCp ligand is sigma-bonded in this compound
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Moessbauer Spectra and Magnetic Susceptibilities of Cs{sub 2}NpCl{sub 6}, (TMA){sub 2}NpCl{sub 6}, and (TEA){sub 2}NpCl{sub 6}
This paper reports additional information obtained from low-temperature magnetic susceptibilities and Moessbauer spectra on Cs{sub 2}NpCl, ((Ch{sub 3}){sub 4}N){sub 2}NpCl{sub 6}, and ((C{sub 2}H{sub 4}){sub 4}N){sub 2}NpCl{sub 6}. The structures of these compounds are inferred from their isostructural uranium and plutonium analogues and the infrared spectral studies
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The Oxidation of Hydrazine by Nitric Acid
Hydrazine nitrate-nitric acid solutions are used in the ion exchange process for separating Pu-238 and Np-237 and have been found to dissolve plutonium metal in a manner advantageous to SRP metal recovery operations. Laboratory tests on the stability of hydrazine in nitric acid solutions were performed to obtain accurate data, and the results of these tests are reported here. These tests provide sufficient information to specify temperature control for hydrazine-nitric acid solutions in plant processes
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EXCITATION FUNCTIONS FOR Bi(p,xn) REACTIONS AT HIGH ENERGIES
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Thiourea - Lanthanide Acetate Complexes
Complexes between thiourea and lanthanide acetates were prepared of the general composition. Dihydrated thiourea complexes are isomorphous; monohydrates are also isomorphous, but with a different structure from the dihydrates. No definite evidence for metal-sulfur bonding was found. This article discusses results of the study
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Cu(II) - Catalyzed Hydrazine Reduction of Ferrous Nitrate
This report discusses the results of a study of catalyzed hydrazine reduction of ferrous nitrate. It is apparent that there is a substantial reaction between hydrazine and nitrate ion (or nitric acid) to produce HN3 during both the reduction of Fe(III) and during storage at room temperature
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Plutonium VI solubility studies in Savannah River Site high level waste
Pu(VI) was found to be stable in synthetic SRS waste supernate for periods of at least one month, and have a solubility of the order of 100 mg/l. Electromigration experiments found PU(VI) migrating toward the anode. Irradiation of synthetic waste tank supernate to 5 {times} 10{sup 6} R reduced Pu(VI) in solutions 6M NaOH and less, but had only a minor effect in higher NaOH concentrations. Irradiation did not affect Pu(VI) solubility in high-salt, high-NaOH solutions. Speciation studies found Pu(VI) the major valence of Pu in waste tank supernate solutions; some Pu(IV) is oxidized to Pu(VI) in strongly basic solutions to increase the Pu solubility. It is proposed that oxygen is the oxidizing agent for Pu(IV), with Pu(IV) disproportionation as a less likely possibility