Chemical and nuclear properties of lawrencium (element 103) and hahnium (element 105)

Technical Report · Mon Sep 10 00:00:00 EDT 1990

DOI:https://doi.org/10.2172/6362919· OSTI ID:6362919

Henderson, R A

The chemical and nuclear properties of Lr and Ha have been studied, using 3-minute {sup 260}Lr and 35-second {sup 262}Ha. The crystal ionic radius of Lr{sup 3+} was determined by comparing its elution position from a cation-exchange resin column with those of lanthanide elements having known ionic radii. Comparisons are made to the ionic radii of the heavy actinides, Am{sup 3+} through Es{sup 3+}, obtained by x-ray diffraction methods, and to Md{sup 3+} and Fm{sup 3+} which were determined in the same manner as Lr{sup 3+}. The hydration enthalpy of {minus}3622 kJ/mol was calculated from the crystal ionic radius using an empirical form of the Born equation. Comparisons to the spacings between the ionic radii of the heaviest members of the lanthanide series show that the 2Z spacing between Lr{sup 3+} and Md{sup 3+} is anomalously small, as the ionic radius of Lr{sup 3+} of 0.0886 nm is significantly smaller than had been expected. The chemical properties of Ha were determined relative to the lighter homologs in group 5, Nb and Ta. Group 4 and group 5 tracer activities, as well as Ha, were absorbed onto glass surfaces as a first step toward the determination of the chemical properties of Ha. Ha was found to adsorb on surfaces, a chemical property unique to the group 5 elements, and as such demonstrates that Ha has the chemical properties of a group 5 element. A solvent extraction procedure was adapted for use as a micro-scale chemical procedure to examine whether or not Ha displays eka-Ta-like chemical under conditions where Ta will be extracted into the organic phase and Nb will not. Under the conditions of this experiment Ha did not extract, and does not show eka-Ta-like chemical properties.

• Research Organization: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
• Sponsoring Organization: DOE/ER
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 6362919
• Report Number(s): LBL-29568; ON: DE91004323; TRN: 90-036821
• Resource Relation: Other Information: Thesis (Ph.D.)
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
BERKELIUM 249 TARGET
OXYGEN 18 REACTIONS
CURIUM 248 TARGET
ELEMENT 105 262
CHEMICAL PROPERTIES
NUCLEAR PROPERTIES
LAWRENCIUM 260
CROSS SECTIONS
ELEMENT 104 261
LAWRENCIUM 261
PRODUCTION
X-RAY DIFFRACTION
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
ALPHA DECAY RADIOISOTOPES
CHARGED-PARTICLE REACTIONS
COHERENT SCATTERING
DIFFRACTION
ELEMENT 104 ISOTOPES
ELEMENT 105 ISOTOPES
EVEN-ODD NUCLEI
HEAVY ION REACTIONS
HEAVY NUCLEI
ISOTOPES
LAWRENCIUM ISOTOPES
MINUTES LIVING RADIOISOTOPES
NUCLEAR REACTIONS
NUCLEI
ODD-EVEN NUCLEI
ODD-ODD NUCLEI
RADIOISOTOPES
SCATTERING
SECONDS LIVING RADIOISOTOPES
TARGETS
652020* - Nuclear Properties & Reactions
A=220 & above
Experimental
400201 - Chemical & Physicochemical Properties