Abstract
The polycrystalline samples of Y 2− x Ho x O 3 (0.10 ≤ x ≤ 1.80) were synthesized by ceramic technology. The X-ray powder diffraction data were collected and the crystal structures were refined by the Rietveld method for the samples Y 2− x Ho x O 3 ( x = 0.00, 0.20, 0.40, 1.20, 1.80, 2.00). Holmium ions Ho 3+ were randomly distributed over two cationic sites 8b and 24d in the space group 1a3 in all refined structures. Cationanioncation bonds important for superexchange interaction were determined. Magnetic susceptibility measurements were done by the Faraday method in the temperature range 290 to 620 K and a behaviour in accordance with the Curie-Weiss law was obtained. The molar Curie's constants linearly depend on concentration. The effective magnetic moments of Ho 3+ ions were smaller than the free ion value. The Curie-Weiss paramagnetic temperatures indicated antiferromagnetic interaction. The gram ion susceptibilities confirmed the random distribution of Ho 3+ ions over two crystallographic sites in the concentration range 0.20 ≤ x ≤ 2.00 and pointed to the random distribution of magnetic ions in the sample with x = 0.10. The nonlinearity of Curie-Weiss paramagnetic temperatures versus concentration occurred in the low concentration region ( x ≤ 0.40), indicating tendency of magnetic ions to form small clusters around cationic sites.
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