Physical--chemical studies of transuranium elements. Progress report, April 1, 1975--March 31, 1976

Author: Peterson, J. R.
Published: United States : [publisher not identified], 1975.
[Oak Ridge, Tennessee] : [U.S. Atomic Energy Commission], 1975.
Physical Description: microfiche : negative ; 11 x 15 cm

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Summary

Major advances in our continuing program to determine, interpret, and correlate the basic chemical and physical properties of the transuranium elements are summarized for the period April 1, 1975, to March 31, 1976. Several instrumentation improvements were made which significantly improve the performance and data handling capabilities of our microscope-spectrophotometer. Spectroscopic and complementary x-ray powder diffraction studies were carried out on EsBr3, EsCl3, EsOBr, an Es(III) bromide, an Es(III) iodide, CfI3, and CfI2. As yet EsBr3 has not been shown to undergo thermal reduction in a manner analogous to CfBr3. Single crystals of K4NpO2(CO3)3, BaNpO2(C2H3O2)3 . 2H2O, Na4NpO2(O2)3 . 9H2O, and Na4UO2(O2)3 .9H2O were grown and analyzed by x-ray diffraction and absorption spectroscopy. Precise bond distances were determined, and the spectral behavior of the neptunyl ion was observed as a function of crystal orientation and ligand field. The performance of our solution microcalorimeter was improved by rebuilding the wheatstone bridge, installing a high-quality ground, and developing further a sample containment bulb which will minimize the possibility of incomplete dissolution of the sample. A micropolarographic cell was developed, evaluated, and used in several attempts to determine the Es(III)--Es(II) potential in acetonitrile. Experimental difficulties were encountered in the handling and dissolution of the einsteinium. (auth)

Report Numbers

ORO-4447-031

Other Subject(s)

Collection

U.S. Atomic Energy Commission depository collection.

Note

DOE contract number: AT(40-1)-4447
NSA number: NSA-33-011568
OSTI Identifier 4133711
Research organization: Tennessee Univ., Knoxville (USA). Dept. of Chemistry.

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