Synthesis and ESR study of (TbxY1 - x)2Cu2O5 solid solutions

• Autorzy: Typek J. , Kostrzewa J. , Guskos N.
• Konferencja: Workshop on Functional Materials FMA 2004, Athens, Greece, 23-26 September 2005
• Języki publikacji: EN

Abstrakty

EN

Polycrystalline samples of (TbxY1 - x)2Cu2O5, where x = 1.0, 0.75, 0.50, 0.38, 0.25, 0.125 and 0, were synthesized by the solid-state reaction technique. XRD measurements showed that the obtained samples are single-phase and belong to the orthorhombic space group Pna21. The observed linear change of the lattice parameters and unit cell volume with terbium concentration is in agreement with Vegard's law. A thermogravimetric study of the decomposition process of the obtained samples revealed small sampledependent mass losses in the temperature range 1030-1050 °C, and a larger, intrinsic mass loss in the range 1100-1150 °C. The former are probably due to the 4 CuO › 2 Cu2O + O2 transformation, while the latter is related to the reaction 2Y2Cu2O5 › 4YCuO2 + O2. The peak temperature of the main decomposition stage varies linearly with terbium concentration, which could be explained by an increasing distortion of coordination polyhedra around the copper ion, caused by the substitution of the larger Tb3+ cation. The ESR spectra of (TbxY1 - x)2Cu2O5 solid solutions showed a complicated structure due to the presence of various copper clusters (tetramers, trimers). Moreover, the ESR spectra were anisotropic in an external magnetic field, despite originating from powder samples.

Słowa kluczowe

EN

solid solution; ESR; copper complexes

• Wydawca: De Gruyter
• Czasopismo: Materials Science Poland
• Rocznik: 2005
• Tom: Vol. 23, No. 4
• Strony: 929--938
• Opis fizyczny: Bibliogr. 35 poz., rys., tab.

Twórcy

autor

Typek J.

autor

Kostrzewa J.

autor

Guskos N.

• Institute of Physics, Szczecin University of Technology, al. Piastów 17, 70-310 Szczecin,,

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