Phase equilibria and oxygen content of intermediate phases in the Sm2O3-SrO-Fe2O3system

被引：3
|
作者：
Khvostova, L., V [1 ]
Volkova, N. E. [1 ]
Gavrilova, L. Ya [1 ]
Maignan, A. [1 ,2 ]
Cherepanov, V. A. [1 ]
机构：
[1] Ural Fed Univ, Inst Nat Sci & Math, Lenin Av 51, Ekaterinburg 620000, Russia
[2] Normandie Univ, CNRS, ENSICAEN, UNICAEN,Lab CRISMAT, 6 Bd Marechal Juin, F-14050 Caen 4, France
来源：
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2021年 / 41卷 / 07期
关键词：
Phase equilibria; Solid solutions; Crystal structure; Oxygen content; RUDDLESDEN-POPPER OXIDES; CRYSTAL-STRUCTURE; CATHODE MATERIALS; LAYERED PEROVSKITE; COMPLEX OXIDES; PHYSICAL-PROPERTIES; COMPOSITE CATHODE; SM; LN; LA;
D O I：
10.1016/j.jeurceramsoc.2021.02.041
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Six types of oxide phases are formed in the Sm2O3?SrO?Fe2O3 system at 1100 ?C in air: perovskite type Sr1-?Sm?FeO3-? (0.05 < ? < 0.50 with the cubic structure, S.G. Pm-3m and 0.85 < x < 1.0 with the orthorhombic structure, S.G. Pbnm), and Ruddlesden-Popper series corresponding to n = 1,2,3, i.e. Sr2-ySmyFeO4-?, Sr3-uSmuFe2O7-? (0 < u < 0.3; u = 1.80) and Sr4-rSmrFe3O10-?. The structural parameters of single-phase samples, refined by the Rietveld method, allowed to reveal the variation of unit cell parameters with composition. A subsolidus isothermal isobaric phase diagram (1100 ?C, Po2 = 0.21 atm) for the 1/2Sm2O3?SrO?1/2Fe2O3 system has been constructed. The compositional triangle was divided into 24 phase fields. The values of oxygen content and mean oxidation state of iron in all single phases were determined by iodometric titration. The changes in oxygen content with temperature in Sr2.7Sm0.3Fe2O7-?, Sr1.2Sm0.8FeO4-?, and Sr3.1Sm0.9Fe3O10-? were studied by TGA within the range of 25-1100 ?C in air. They show that the maximum oxidation state of Fe ions in RP oxides at room temperature increases with n, reaching 3.52 for the Sr3.1Sm0.9Fe3O10-? n = 3 member.
引用
收藏
页码：4199 / 4205
页数：7
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