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Title: Interaction of divalent plutonium and curium

Abstract

It has been established that at plutonium concentrations ranging from 10/sup -5/ to 10/sup -4/ mole % the oxidation potentials of the Pu/sup 3 +//Pu/sup 2 +/ and Cm/sup 3 +//Cm/sup 2 +/ pairs increased by 0.15-0.2 V due to the dimerization of Pu/sup 2 +/ and the formation of mixed dimers of plutonium and curium. Promethium(2+) does not have a similar ability to form mixed dimers owing to the fact that Pm/sup 2 +/ does not have a free d electron. The oxidation potential of the Pm/sup 3 +//Pm/sup 2 +/ pair does not vary in the presence of massive quantities of plutonium

Authors:
; ;
Publication Date:
OSTI Identifier:
6084982
Alternate Identifier(s):
OSTI ID: 6084982
Resource Type:
Journal Article
Resource Relation:
Journal Name: Sov. Radiochem. (Engl. Transl.); (United States); Journal Volume: 30:2; Other Information: Translated from Radiokhimiya; 30: No. 2, 270-272(Mar-Apr 1988)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY; CURIUM COMPOUNDS; REDOX POTENTIAL; PLUTONIUM COMPOUNDS; DIMERIZATION; DIMERS; ELECTRONIC STRUCTURE; EXCITATION; EXCITED STATES; NEODYMIUM COMPOUNDS; PROMETHIUM COMPOUNDS; QUANTITY RATIO; VALENCE; ACTINIDE COMPOUNDS; CHEMICAL REACTIONS; ENERGY LEVELS; ENERGY-LEVEL TRANSITIONS; POLYMERIZATION; RARE EARTH COMPOUNDS; TRANSPLUTONIUM COMPOUNDS; TRANSURANIUM COMPOUNDS 400201* -- Chemical & Physicochemical Properties; 400702 -- Radiochemistry & Nuclear Chemistry-- Properties of Radioactive Materials

Citation Formats

Mikheev, N.B., Kazakevich, M.Z., and Rumer, I.A. Interaction of divalent plutonium and curium. United States: N. p., 1988. Web.
Mikheev, N.B., Kazakevich, M.Z., & Rumer, I.A. Interaction of divalent plutonium and curium. United States.
Mikheev, N.B., Kazakevich, M.Z., and Rumer, I.A. Tue . "Interaction of divalent plutonium and curium". United States. doi:.
@article{osti_6084982,
title = {Interaction of divalent plutonium and curium},
author = {Mikheev, N.B. and Kazakevich, M.Z. and Rumer, I.A.},
abstractNote = {It has been established that at plutonium concentrations ranging from 10/sup -5/ to 10/sup -4/ mole % the oxidation potentials of the Pu/sup 3 +//Pu/sup 2 +/ and Cm/sup 3 +//Cm/sup 2 +/ pairs increased by 0.15-0.2 V due to the dimerization of Pu/sup 2 +/ and the formation of mixed dimers of plutonium and curium. Promethium(2+) does not have a similar ability to form mixed dimers owing to the fact that Pm/sup 2 +/ does not have a free d electron. The oxidation potential of the Pm/sup 3 +//Pm/sup 2 +/ pair does not vary in the presence of massive quantities of plutonium},
doi = {},
journal = {Sov. Radiochem. (Engl. Transl.); (United States)},
number = ,
volume = 30:2,
place = {United States},
year = {Tue Nov 01 00:00:00 EST 1988},
month = {Tue Nov 01 00:00:00 EST 1988}
}
  • (The average number of prompt neutron v /SUB p/ and the distributions of prompt neutron number probability P(v) for spontaneous fission of /sup 240/Pu, /sup 242/Cm, and /sup 244/Cm relative to v /SUB p/ (/sup 252/Cf) have been measured using a large gadolinium-loaded liquid scintillation counter with a coincidence method.)The results were v /SUB p/ (/sup 240/Pu)=2.141+ or 0.016, v /SUB p/ (/sup 242/Cm)=2.562 + or - 0.020, and v /SUB p/ (/sup 244/Cm)= 2.721 + or - 0.021. (The measured distributions of prompt neutron number were fitted with Gaussian curves by a weighted least-squares method.) The widths of Gaussianmore » distribution are 1.149 + or - 0.047, 1.159 + or - 0.074, and 1.175 + or 0.098 for /sup 240/Pu, /sup 242/Cm, and /sup 244/Cm, respectively. (The results as well as a previous measurement of spontaneous fission of /sup 252/Cf show the linear variation of sigma with v /SUB p/ at the first order of approximation.) The data were fitted by a least-squares method, and the result is given by a sigma= 0.980+0.076v /SUB p/ . This fact demonstrates the trend that the width of the excitation energy distribution of fission fragments increases with the average excitation energy of the fission fragments in the range of nuclides mentioned above.« less
  • We carried out a plant uptake and translocation experiment in which a wheat crop was grown on Yolo soil contaminated with /sup 237/Np, /sup 238/Pu, /sup 239/ /sup 240/Pu, /sup 241/Am, and /sup 244/Cm. Studying pot-to-pot variability, we found the data a coefficient of variation of 21 percent. About 9 percent of this variability we ascribe to that of radioanalyses of the plant material. Both uptake and translocation of /sup 238/Pu and /sup 239/ /sup 240/Pu were found to be identical. Likewise, both uptake and translocation of /sup 241/Am and /sup 244/Cm were identical. The Pu concentration was about 10/supmore » 3/ lower in the grain than in the bottom one-half of the stem plus leaves.« less
  • The existence of divalent plutonium was first established in 1982. Then it was shown that in this valence form it has the electronic configuration f/sup n/minus/1/d/sup 1/. The presence of a d-electron in Pu/sup 2+/ is the cause of its dimerization, which is manifested in a study of directed crystallization and in the value of the redox potential of the couple Pu/sup 3+//Pu/sup 2+/.
  • The standard oxidation potential of the Pu/sup 3 +//Pu/sup 2 +/ pair has been determined from experiments in melts of salts with plutonium concentrations ranging from 10/sup -6/ to 10/sup -7/ mole %. The value obtained is 0.18 V lower than the value obtained in similar experiments with plutonium concentrations ranging from 10/sup -4/ to 10/sup -5/ mole %. It has been concluded that Pu/sup 2 +/ undergoes dimerization, and the dimerization energy has been calculated.