Electron paramagnetic resonance studies of dilute europium-ammonia systems

Journal Article · Thu Apr 07 04:00:00 EDT 1988 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100318a022· OSTI ID:5023596

Hsu, S C.P.; Glaunsinger, W S

EPR of divalent europium has been used to probe the nature of metallic metal-hexaammine compounds and dilute metal-ammonia solutions in the concentration range 6.2 x 10/sup -6/ to 5 x 10/sup -3/ mole percent metal. The EPR signals of both solvated electrons and Eu/sup 2 +/ spins are observed in dilute solutions, and there is a rather strong magnetic interaction between the solvated electrons and Eu/sup 2 +/. In metal-hexaammine compounds lightly doped with Eu, the interactions between the Eu/sup 2 +/ moments and between the Eu/sup 2 +/ moments and conduction electrons are very weak. In Ca(NH/sub 3/)/sub 6/ doped with Eu, the EPR signals of both Eu/sup 2 +/ and the conduction electrons are observed simultaneously, and the low-temperature EPR spectrum of Eu/sup 2 +/ in Sr(NH/sub 3/)/sub 6/ is suggestive of a structural phase transition. The use of isotopically enriched /sup 153/Eu simplifies the EPR spectra and facilitates spectral analysis. The EPR parameters for the solvated electrons, Eu/sup 2 +/, and conduction electrons present in these systems are evaluated and discussed.

• Research Organization: Arizona State Univ., Tempe (USA)
• OSTI ID: 5023596
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 92:7; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400201* -- Chemical & Physicochemical Properties
400600 -- Radiation Chemistry
ALKALINE EARTH METAL COMPOUNDS
AMMINES
AMMONIA
CALCIUM COMPOUNDS
CATIONS
CHARGED PARTICLES
COMPLEXES
DATA
DISPERSIONS
ELECTRON SPIN RESONANCE
ELECTRONS
ELEMENTARY PARTICLES
EUROPIUM COMPOUNDS
EXPERIMENTAL DATA
FERMIONS
HYDRIDES
HYDROGEN COMPOUNDS
INFORMATION
IONS
LEPTONS
MAGNETIC MOMENTS
MAGNETIC RESONANCE
MIXTURES
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
NUMERICAL DATA
RARE EARTH COMPOUNDS
RESONANCE
SOLUTIONS
SOLVATED ELECTRONS