Structural Studies of Bi2(FexAl1-x)4O9 Solid Solutions (0.1 ≤ x ≤ 1.0) Prepared by a Combined Mechanochemical/Thermal Synthesis

被引：18
|
作者：
Da Silva, Klebson L. [1 ,2 ]
Sepelak, Vladimir [3 ]
Paesano, Andrea, Jr. [2 ]
Litterst, F. Jochen [4 ]
Becker, Klaus-Dieter [1 ]
机构：
[1] Tech Univ Carolo Wilhelmina Braunschweig, Inst Phys & Theoret Chem, D-38106 Braunschweig, Germany
[2] Univ Estadual Maringa, Dept Phys, BR-87020900 Maringa, Parana, Brazil
[3] Karlsruhe Inst Technol, Inst Nanotechnol, D-76344 Eggenstein Leopoldshafen, Germany
[4] Tech Univ Carolo Wilhelmina Braunschweig, Inst Phys Kondensierten Mat, D-38106 Braunschweig, Germany
来源：
ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE | 2010年 / 636卷 / 06期
关键词：
Mullite-type compounds; Mossbauer spectroscopy; Rietveld analysis; Bismuth; Iron; Aluminum; OXIDE-ION CONDUCTIVITY; BI2AL4O9; MOSSBAUER; BI2GA4O9; BI2FE4O9; SYSTEM;
D O I：
10.1002/zaac.201000032
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
Bi-2(FexAl1-x)(4)O-9 solid solutions with 0.1 <= x <= 1.0 prepared by mechanochemical processing of alpha-Fe2O3/Bi2O3/Al2O3 mixtures and subsequent annealing were investigated by X-ray diffraction, Mossbauer spectroscopy, and EDX. A Rietveld refinement was made for the whole range of the solid solutions. The structure is orthorhombic with space group Pbam. Mossbauer spectroscopy reveals paramagnetic behavior for Bi-2(FexAl1-x)(4)O-9 with 0.1 <= x <= 1.0 at room temperature and indicates significant distortion of the octahedral iron coordination for aluminum-rich mixed crystals. The occupancy of octahedrally and tetrahedrally coordinated sites was determined by Mossbauer spectroscopy and Rietveld analysis. For x >= 0.5, the Mossbauer measurements as well as the Rietveld refinements show an almost random distribution of aluminum and iron cations over the two non-equivalent sites, whereas for x < 0.5, a slight preference of iron for the octahedral sites is observed.
引用
收藏
页码：1018 / 1025
页数：8
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