Stability and properties of brownmillerites Ca2(Al, Mn, Fe)2O5 and perovskites Ca(Mn, Fe)O3-x in the system Ca2Fe2O5-"Ca2Mn2O5"-"Ca2Al2O5"

被引：16
|
作者：
Zoetzl, Matthias [1 ]
Poellmann, Herbert [1 ]
机构：
[1] Univ Halle Wittenberg, Inst Geol Wissensch & Geisaltalmuseum, D-06120 Halle, Germany
来源：
JOURNAL OF THE AMERICAN CERAMIC SOCIETY | 2006年 / 89卷 / 11期
关键词：
D O I：
10.1111/j.1551-2916.2006.01242.x
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：
Solid solutions of manganese-substituted brownmillerites and their stability range in the Ca2Fe2O5-"Ca2Mn2O5"-"Ca2Al2O5"-system were investigated. Samples were synthesized by solid-state reactions in temperature ranges at 1250 degrees-1300 degrees C. The phase development was investigated by powder X-ray diffraction and d-spacings and lattice parameters of new phases were determined. Ternary solid solutions of the hydraulic brownmillerites crystallize in a wide range of compositions (C2F-C(6)A(2)F-C(6)A(2)Mn-C(4)AMn-C(6)A(0.5)F(2)Mn(0.5)-C2F0.83Mn0.17). Brownmillerite, C(12)A(7) and C(3)A coexist at Al3+-additions above 66 mol%. Various oxygen defect perovskites are stable in the "C4FMn"-"C2Mn" field. "C2Mn" crystallizes as CaMnO2.8 and "C4FMn" as CaFe0.5Mn0.5O3-x. The other stability fields can be characterized by the coexistence of brownmillerite-type solid solutions and by different oxygen defect perovskites depending on the amounts of manganese and reaction conditions.
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收藏
页码：3491 / 3497
页数：7
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