{"title":"Studies in the BaO2–BaO–CuO system","authors":"J.L. Jondo, S. Phok, Ph. Galez, J.-L. Jorda","doi":"10.1016/S1463-0184(02)00053-9","DOIUrl":null,"url":null,"abstract":"<div><p><span>The complex ternary system Ba-Cu- O has been re-visited in 0.1 MPa oxygen pressure. It is established that for such pressure, the </span><span><math><mtext>BaO</mtext><msub><mi></mi><mn><mtext>2</mtext></mn></msub><mtext>=</mtext><mtext>BaO+</mtext><mtext>1</mtext><mtext>2</mtext><mtext>O</mtext><msub><mi></mi><mn>2</mn></msub></math></span> reaction has an important role for reaching the equilibrium state. The pathway for the phase formation is then described in ternary sections BaO<sub>2</sub>-BaO-CuO. We have specified the temperatures and the forming reactions of the 3 compounds in the system: Ba<sub>2</sub><span>CuO</span><sub>3.04</sub> decomposes by peritectic-like reaction at 1033°C and shows a structural transition from orthorhombic to tetragonal for at 825°C, BaCuO<sub>2</sub> is a congruent melting compound at 1035°C and Ba<sub>2</sub>Cu<sub>3</sub>O<sub>5.5</sub> undergoes a peritectoïdic decomposition into BaCuO<sub>2</sub> and CuO at 893°C.</p></div>","PeriodicalId":10766,"journal":{"name":"Crystal Engineering","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2002-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1463-0184(02)00053-9","citationCount":"6","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Crystal Engineering","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1463018402000539","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 6
Abstract
The complex ternary system Ba-Cu- O has been re-visited in 0.1 MPa oxygen pressure. It is established that for such pressure, the reaction has an important role for reaching the equilibrium state. The pathway for the phase formation is then described in ternary sections BaO2-BaO-CuO. We have specified the temperatures and the forming reactions of the 3 compounds in the system: Ba2CuO3.04 decomposes by peritectic-like reaction at 1033°C and shows a structural transition from orthorhombic to tetragonal for at 825°C, BaCuO2 is a congruent melting compound at 1035°C and Ba2Cu3O5.5 undergoes a peritectoïdic decomposition into BaCuO2 and CuO at 893°C.