Phase equilibria in the Nd2O3-BaO-Fe2O3 system: Crystal structure, oxygen content, and properties of intermediate oxides

被引：3
|
作者：
Aksenova, Tatiana, V [1 ]
Volkova, Nadezhda E. [1 ]
Maignan, Antoine [1 ,2 ]
Cherepanov, Vladimir A. [1 ]
机构：
[1] Ural Fed Univ, Inst Nat Sci & Math, Ekaterinburg, Russia
[2] Normandie Univ, Lab CRISMAT, UNICAEN, CNRS,UMR 6508, Caen, France
来源：
JOURNAL OF THE AMERICAN CERAMIC SOCIETY | 2022年 / 105卷 / 05期
关键词：
crystal structure; oxide materials; oxygen nonstoichiometry; phase diagram; X-ray diffraction; THERMODYNAMIC PROPERTIES; ELECTRICAL-PROPERTIES; MAGNETIC-PROPERTIES; CATHODE MATERIALS; COMPLEX OXIDES; TERNARY OXIDES; LN; SM; PEROVSKITE; ND;
D O I：
10.1111/jace.18327
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：
The phase equilibria in the 1/2Nd(2)O(3)-BaO-1/2Fe(2)O(3) system were systematically studied at 1373 K in air and presented in the form of a phase diagram. By X-ray diffraction (XRD) analysis of quenched samples, the homogeneity ranges and crystal structure were determined for the following intermediate oxides: Nd1-xBaxFeO3-delta with 0.0 <= x <= 0.05 (space group (SG) Pnma) and with 0.6 <= x <= 0.7 (SG Pm-3m), Ba6+yNd2-yFe4O15-delta with 0.0 <= y <= 0.4 (SG P6(3)mc), and Ba1.1Nd1.9Fe2O7-delta (SG P4(2)/mnm). The structural parameters of single-phase oxides were refined by the Rietveld method. The changes in oxygen content for Nd1-xBaxFeO3-delta (0.6 <= x <= 0.7), Ba6Nd2Fe4O15-delta, and Ba1.1Nd1.9Fe2O7-delta versus temperature in air were determined by thermogravimetric analysis. Gradual substitution of neodymium by barium in the Nd1-xBaxFeO3-delta (0.6 <= x <= 0.7) oxides leads to a decrease of oxygen content. Partial ordering via formation of separate domains with a(p) x a(p) x 5a(p) superstructure in Nd0.4Ba0.6FeO3-delta, which cannot be detected by XRD, noticeably influence its thermal expansion and electrical conductivity.
引用
收藏
页码：3601 / 3612
页数：12
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