Paramagnetic resonance of Er+++ in calcium and strontium oxide

The ESR spectra of Yb3+ and Er3+ in cubic sites of SrCl2 (Fluorite structure) have been observed at a frequency of 10 Gc/sec and at 4.2° and 20°K. The spectra were isotropic with g = 3.417 ± 0.001 for Yb3+ and g = 6.754 ± 0.005 for Er3+ indicating that a Γ7 doublet is the ground state in both cases. The Er3+ Γ7 ground state shows that a large variation in the B4 / B6 ratio consistent with the point-charge model is not present in the more inflated SrCl2 lattice relative to other fluorite-type hosts. The Yb3+Γ7 ground state is in agreement with previous measurements on Yb3+ in eightfold coordinated cubic sites and no behavior inconsistent with predictions of the point-charge model was in evidence. Hyperfine structure was resolved with A(171Yb) = 881 ± 1 × 10−4cm−1, A(173Yb) = 242.9 ± 0.3 × 10−4cm−1, and A(167Er) = 233.5 ± 0.3 × 10−4cm−1. Axial spectra were also observed but not measured due to their low intensity and linewidth variation with magnetic-field orientation.

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Electron Spin Resonance Spectra of Er3+ and Yb3+ in Single Crystals of SrCl2

Boatner

Reynolds

Abraham

1968

The Journal of Chemical Physics

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Growth of High-Purity and Doped Alkaline Earth Oxides: I. MgO and CaO

Abraham

Butler

Chen

1971

The Journal of Chemical Physics

176

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A new variation of the carbon arc-fusion technique is reported which makes possible the growth of large, high-purity MgO and CaO single crystals which are free of microbubbles. A technique has also been developed for impurity doping. We have successfully doped MgO with Na, D, Ce, Eu, Gd, Dy, and Yb; and CaO with Li, Na, Ce, and Nd. The presence of these dopants has been ascertained by chemical analyses, optical, or EPR measurements. EPR signals showed minimal effects from strains in these crystals.

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Magnetic susceptibilities of trivalent lanthanide ions in an octahedral environment

Hoehn

Karraker

1974

The Journal of Chemical Physics

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Magnetic susceptibilities for eight lanthanide ions in Cs2NaLnCl6 were measured from 2.5 to [inverted lazy s] 80°K with a vibrating sample magnetometer. Computer fitting of the data for Cs2NaCeCl6 gave g = 1.43 for the Γ7 ground level, and f2 = 3.85 for the Γ8 excited level. These values are in good agreement with values calculated from first-order wavefunctions. The ground crystal field level for Nd3+ in Cs2NaNdCl6 was found to be a Γ8 level. Because of singlet ground levels and small crystal field splitting, no positive information on the ground crystal field levels was obtained for Pr3+, Tb3+, Dy3+, Ho3+, Er3+, or Tm3+ compounds. Based on Nd3+ and Ce3+ results, the ratio A40<r4>/A60<r6> was estimated to be about 20; A40<r4>, of the order of 10 cm−1; and A60<r6>, of the order of 1 cm−1.

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Paramagnetic resonance of Er+++ in calcium and strontium oxide

Cited by 8 publications

References 5 publications

Electron Spin Resonance Spectra of Er3+ and Yb3+ in Single Crystals of SrCl2

Electron Spin Resonance Spectra of Er3+ and Yb3+ in Single Crystals of SrCl2

Growth of High-Purity and Doped Alkaline Earth Oxides: I. MgO and CaO

Magnetic susceptibilities of trivalent lanthanide ions in an octahedral environment

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