Paramagnetic Resonance and Charge Compensation of Tetravalent Uranium ( $U^{4 +}$ ) in Calcium, Strontium, and Barium Fluorides

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15 November 1962

journal article
research article
Published by American Physical Society (APS) in Physical Review B

Vol. 128 (4) , 1588-1592
https://doi.org/10.1103/physrev.128.1588

Abstract

A new electron spin paramagnetic resonance spectrum in Ca

F_{2}

doped with uranium is attributed to

U^{4 +}

. The spectrum possesses axial symmetry about the

〈 111 〉

directions and is describable by a spin Hamiltonian with

g_{⊥} = 0 \pm 0.15

and

g_{II} = 3.238 \pm 0.005

at 4.2°K. The trigonal symmetry is due to the presence of charge compensating

O^{2 -}

ions along the

〈 111 〉

directions. The spectrum is absent in crystals grown under reducing conditions. Similar results were also observed in Sr

F_{2}

and Ba

F_{2}

.

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