Modification of the Physicochemical Properties of YBa2Cu3O6 + Оґ by Means of Mechanochemistry
G. A. KOZHINA1, A. V. FETISOV1, L. B. BEDMID1, S. KH. ESTEMIROVA1, A. A. BELOZEROVA1, V. B. FETISOV2 and E. A. PASTUKHOV1
1 Institute of Metallurgy, Ural Branch of the Russian Academy of Sciences, Ul. Pervomayskaya 91, Yekaterinburg 620016 (Russia)
2 Ural State of Agricultural Academy, Ul. Karla Libknekhta 42, Yekaterinburg 620075 (Russia)
gakozhina@yandex.ru
Keywords: mechanochemical activation, yttrium-barium cuprate, thermogravimetry, X-ray photoelectron spectroscopy
Pages: 385–390
Abstract
Physicochemical state of YBa2Cu3O6 + δ powder subjected to mechanochemical treatment was studied by means of thermogravimetry, X-ray diffraction, iodometry and X-ray photoelectron spectroscopy. It is demonstrated that the indicated treatment causes broadening of the range of variation for oxygen parameter (δ) and an increase in the chemical activity of yttrium/barium cuprate above the limit that can be attributed to a decrease in particle size. The discovered features are due to increased non-equilibrium character of activated YBa2Cu3O6 + δ, including uncharacteristic combination of the oxidation numbers of copper and oxygen ions interacting with each other (Cu3+, O–).
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