Electron Paramagnetic Resonance of Several Rare-Earth Impurities in the Cubic Perovskite KMg $F_{3}$

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1 May 1971

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

Vol. 3 (9) , 2855-2864
https://doi.org/10.1103/physrevb.3.2855

Abstract

The electron paramagnetic resonance spectra of doped KMg

F_{3}

single crystals containing

{Yb}^{3 +}

,

{Tm}^{2 +}

,

{Er}^{3 +}

,

{Dy}^{3 +}

, and

{Gd}^{3 +}

have been observed at 9 GHz. Cubic symmetry sites have been identified for these ions and the data indicate that the

{Yb}^{3 +}

,

{Tm}^{2 +}

,

{Er}^{3 +}

, and

{Dy}^{3 +}

substitute for the sixfold-coordinated

{Mg}^{2 +}

ion, but that the gadolinium probably substitutes for a twelvefold-coordinated

K^{1 +}

ion. Noncubic symmetry sites were also observed for

{Yb}^{3 +}

,

{Er}^{3 +}

, and

{Gd}^{3 +}

. Hyperfine structure for the isotopes

{}^{171}{Yb}

,

{}^{173}{Yb}

,

{}^{169}{Tm}

,

{}^{167}{Er}

,

{}^{161}{Dy}

, and

{}^{163}{Dy}

was identified, and in some cases superhyperfine interactions with the fluorine ligand ions were observed with good resolution.

Keywords

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