{"title":"Structural changes and surface properties of thermally treated pure and doped cobalt oxide","authors":"Awad I. Ahmed , Th. El-Nabarawy","doi":"10.1016/0376-4583(85)90119-0","DOIUrl":null,"url":null,"abstract":"<div><p>Surface area measurements were carried out by nitrogen adsorption at —196 °C on cobalt oxide and on lithium- and ferric-doped cobalt oxides. Thermal products were obtained by calcination in the temperature range 250–1000 °C. Structural and phase changes were studied by differential thermal analysis (DTA) and X-ray techniques.</p><p>DTA of samples showed that heating of the pure and doped cobalt hydroxide in air in the temperature range 250–700 °C yields Co<sub>3</sub>O<sub>4</sub>. On increasing the heating temperature to 800 °C CoO is formed. The dehydration products obtained at temperature less than 500 °C were amorphous to X-rays. Doping with foreign ions causes textural changes in the parent solid.</p></div>","PeriodicalId":22037,"journal":{"name":"Surface Technology","volume":"26 3","pages":"Pages 225-234"},"PeriodicalIF":0.0000,"publicationDate":"1985-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0376-4583(85)90119-0","citationCount":"2","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Surface Technology","FirstCategoryId":"1087","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/0376458385901190","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 2
Abstract
Surface area measurements were carried out by nitrogen adsorption at —196 °C on cobalt oxide and on lithium- and ferric-doped cobalt oxides. Thermal products were obtained by calcination in the temperature range 250–1000 °C. Structural and phase changes were studied by differential thermal analysis (DTA) and X-ray techniques.
DTA of samples showed that heating of the pure and doped cobalt hydroxide in air in the temperature range 250–700 °C yields Co3O4. On increasing the heating temperature to 800 °C CoO is formed. The dehydration products obtained at temperature less than 500 °C were amorphous to X-rays. Doping with foreign ions causes textural changes in the parent solid.
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