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2007 | 112 | 3 | 525-536
Article title

EPR Study of Water Induced Decomposition of the SrCuO_2 and Sr_2CuO_3 Ceramics Surface. The Role of Carbon Dioxide

Content
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EN
Abstracts
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.
Keywords
EN
Year
Volume
112
Issue
3
Pages
525-536
Physical description
Dates
published
2007-09
received
2007-07-06
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Document Type
Publication order reference
YADDA identifier
bwmeta1.element.bwnjournal-article-appv112n305kz
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