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1
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XPS Study of "infinite Chain" Ca_{2}CuO_{3} and Ca_{0.5}Sr_{0.5}CuO_{2} Compounds

100%
Jacyna-Onyszkiewicz I., Poltoracky Y.
Acta Physica Polonica A
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2000
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vol. 97
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issue 3
603-606
EN
Al K_{α} excited photoelectron spectra (X-ray photoelectron spectroscopy) of the O 1s, Cu 2p, Ca 2p, Sr 3d core levels were measured for "infinite chain" Ca_{2}CuO_{3} and Ca_{0.5}Sr_{0.5}CuO_{2} compounds. The analysis indicates that for Ca_{2}CuO_{3} the surface electronic structure is strongly influenced by a humid atmosphere. The surface layer is formed predominantly by copper hydroxide. The minor features of Cu 2p and O 1s are characteristic of the bulk bonding states. The valences of the Cu, Ca, and Sr atoms are close to 2+. The core electron binding energies (≈ 934 eV peak) are due to the 2p_{3/2}3d^{10}L^{1} configuration of Cu(II) ions in the square planar coordination for both samples.
2
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The Origin of EPR Signals in SrCuO_2 Ceramics

71%
Augustyniak-Jabłokow M., Yablokov Y., Ivanova T., Jacyna-Onyszkiewicz I., Shustov V.
Acta Physica Polonica A
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2005
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vol. 108
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issue 2
345-351
EN
The origin and thermal evolution of the EPR signals in SrCuO_2 ceramics are studied. It has been shown that the EPR signals observed in this ceramic material are due to contamination with other phases. The axial signal is due to SrCu(OH)_4·H_2O, which is a product of water reactions with SrCuO_2.
3
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Transport and Magnetic Studies of New Mixed-Valence Compounds: K_{3}Cu_{8}Se_{6}, KCu_{3}Se_{2}, K_{3}Cu_{8}Te_{6} and BaCuS_{3-x}

71%
Jacyna-Onyszkiewicz I., Sidowski M., Starodub W., Ratuszna A., Robaszkiewicz S.
Acta Physica Polonica A
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1997
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vol. 91
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issue 2
405-408
EN
New mixed-valent copper chalcogenides BaCuS_{3-x} and K_{3}Cu_{8}X_{6} with X=Se or Te and KCu_{3}Se_{2}, with chemical patterns corresponding to the recently investigated K_{3}Cu_{8}S_{6} and KCu_{3}S_{2}, were synthesized. For these new samples the results of resistivity and magnetic susceptibility measurements are presented. For BaCuS_{3-x}, K_{3}Cu_{8}Se_{6} and KCu_{3}Se_{2} the metal-insulator transition is observed with the low temperature phase being metallic, which is untypical, whereas K_{3}Cu_{8}Te_{6} is a metal in the investigated temperature range. The temperature dependence of magnetic susceptibility of the studied samples testifies to their diamagnetic or weakly paramagnetic behaviour.
4
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EPR Study of Water Induced Decomposition of the SrCuO_2 and Sr_2CuO_3 Ceramics Surface. The Role of Carbon Dioxide

71%
Augustyniak-Jabłokow M., Yablokov Y., Jacyna-Onyszkiewicz I., Ivanova T., Shustov V.
Acta Physica Polonica A
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2007
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vol. 112
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issue 3
525-536
EN
Processes of SrCuO_2 and Sr_2CuO_3 ceramics decomposition induced by contact with water and carbon dioxide were studied by EPR. The dominant signals in the spectra were found to originate from Sr_2Cu(OH)_6 (for Sr_2CuO_3) and SrCu(OH)_4·H_2O (for SrCuO_2) compounds. The thermally induced conversion of SrCu(OH)_4·H_2O into Sr_2Cu(OH)_6 was analysed, and its product CuO was found to exist in the nanocrystalline form. The presence of CO_2, reacting with Sr(OH)_2, was shown to modify the decomposition process leading to the appearance of SrCu(OH)_4·H_2O, some hydroxycarbonates and Cu(OH)_2 on the surface of ceramics studied. At temperatures higher than 300ºC CuO reacts back with Sr(OH)_2. For the samples being in contact with atmospheric moisture this compound, deposited on a surface of SrCuO_2, decomposes to Sr_2Cu(OH)_6. The presence of the antiferromagnetic compounds Cu(OH)_2, CuO, and Cu_2[(OH)_2CO_3] in the samples can influence the results of magnetic measurements of the studied ceramics.
5
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Delocalization of the Cu^{2+} Unpaired Electron on the Next Nearest Ligands in Sr_2Pd_{0.99}Cu_{0.01}O_3 Ceramics

61%
Augustyniak-Jabłokow M., Yablokov Y., Jacyna-Onyszkiewicz I., Ivanova T., Shustov V., Polovniak V.
Acta Physica Polonica A
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2008
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vol. 114
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issue 1
197-201
EN
Supertransferred hyperfine interactions between the Cu^{2+} unpaired electron and the ^{105}Pd nuclei in the Sr_2Pd_{0.99}Cu_{0.01}O_3 ceramic were studied by the EPR method. The spectrum of isolated -Pd-O-CuO_2-O-Pd- units (g_∥ = 2.280±0.001; g_⊥ = 2.040±0.001; A_∥(^{63}Cu) = 13 mT±0.1; A_∥(^{65}Cu) = 13.9 ±0.1 mT; A_⊥(^{63,65}Cu) = 0.0 mT) overlaps the signal from small groups of exchange coupled Cu^{2+} ions (g_∥ = 2.278±0.002; g_⊥ = 2.041±0.001). The isotropic contribution was shown to dominate in the Cu-Pd supertransferred interactions (A_∥(^{105}Pd) = A_⊥ (^{105}Pd) = 1 mT = a_{iso} Pd).
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