Optical and EPR investigations of Np/sup 4 +/ in single crystals of ZrSiO/sub 4/

Journal Article · Tue Mar 01 04:00:00 EST 1988 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.37.3255· OSTI ID:5250544

Poirot, I; Kot, W; Shalimoff, G; Edelstein, N; Abraham, M M; Finch, C B; Boatner, L A

Polarized optical spectroscopy has been used to investigate the electronic structure of tetravalent neptunium incorporated as a dilute impurity in single crystals of the tetragonal host ZrSiO/sub 4/. Thirty-one levels were assigned from 30 intense polarized optical transitions and used to obtain a fit to a parametric Hamiltonian to within an rms deviation of 34 cm/sup -1/. Thirteen other levels with comparable intensities and good polarization characteristics were observed. Inclusion of these levels using the parameters from the 31-level fit, however, resulted in an increase of the rms deviation to approximately 100 cm/sup -1/. The EPR spectra of the ground state of Np/sup 4 +/:ZrSiO/sub 4/ were measured and fit to an axial spin Hamiltonian to obtain the parameters: )vertreverse arrowbar)g/sub X/)vertreverse arrowbar) = 0.8 +- 0.6, )vertreverse arrowbar)g/sub perpendicular/)vertreverse arrowbar) = 2.59 +- 0.02, A = -2400 +- 1200 MHz, and B = 4750 +- 30 MHz. These results are consistent with the calculated GAMMA/sub 6/ ground state

• Research Organization: Materials and Chemical Sciences Division, Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 5250544
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 37:7; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
CHARGED PARTICLES
CRYSTALS
ELECTRON SPIN RESONANCE
ELECTRONIC STRUCTURE
IMPURITIES
IONS
MAGNETIC RESONANCE
MONOCRYSTALS
NEPTUNIUM IONS
OPTICAL PROPERTIES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RESONANCE
SILICATES
SILICON COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
VALENCE
ZIRCONIUM COMPOUNDS
ZIRCONIUM SILICATES