Abstract

The electric quadrupole and magnetic hyperfine interactions rneasured from the 161 Dy Mossbauer resonance in crystalline Dy(OH)3 and from the 166 Er resonance in crystalline Ho(OH)3 and Er(OH)3 are interpreted using the crystal field and molecular exchange field model . The crystal field parameters established from previous optical spectroscopy results account weIl for these hyperfine parameters. The crystal-field and magnetic properties of these ferromagnetic insulators are described weIl within the model.

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