Abstract
Reactivity in the solid state between CuWO 4 and Gd 2WO 6 was investigated up to solidus line. Two new compounds with the formulas Cu 3Gd 2W 4O 18 and CuGd 2W 2O 10 were synthesized. Cu 3Gd 2W 4O 18 and CuGd 2W 2O 10 melt incongruently at 1173 and 1248 K, respectively. Cu 3Gd 2W 4O 18 crystallizes in the triclinic system. Its anion lattice is built by isolated groups [(W 4O 16) 8−]. CuGd 2W 2O 10 crystallizes in the monoclinic system and its anion lattice is formed by structure elements [(W 2O 9) 6−]∞. The asymmetric EPR signals of Cu 3Gd 2W 4O 18 and CuGd 2W 2O 10, characteristic for concentrated, conducting magnetic systems are the same (Gd 3+ exchange interactions) but the antiferromagnetic interaction between Gd 3+ ions is lower as compared to Gd 2WO 6. Resonance line attributed to Cu 2+ ions is not observed in EPR spectra of Cu 3Gd 2W 4O 18 and CuGd 2W 2O 10.
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