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Heavy metal bismuthate glass and glass-ceramic samples with gadolinium oxide were obtained by quick undercooling of melts and later heat treatments. Magnetic susceptibility data suggest that beside homogeneously distributed Gd³⁺ ions, both in the glass and glass-ceramic samples, there are clustered Gd³⁺ ions experiencing antiferromagnetic interactions. In all cases the magnetic moments are smaller than the value corresponding to free Gd³⁺ ions and decrease with gadolinium content. The decrease is linear and the slope depends on the glass matrix composition.

Keywords: Glass; glass-ceramics; heavy metals; magnetic properties.