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题名: Thermal Evolution Crystal Structure and Fe Crystallographic Sites in LaFexAl12-xO19 Hexaaluminates
作者: Zhang, Yan1, 2;  Wang, Xiaodong1;  Zhu, Yanyan3;  Liu, Xin1;  Zhang, Tao1
刊名: JOURNAL OF PHYSICAL CHEMISTRY C
发表日期: 2014-05-22
DOI: 10.1021/jp500682d
卷: 118, 期:20, 页:10792-10804
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Physical ;  Nanoscience & Nanotechnology ;  Materials Science, Multidisciplinary
研究领域[WOS]: Chemistry ;  Science & Technology - Other Topics ;  Materials Science
英文摘要: Compared with BaFe12O19 hexaferrite, La-magnetoplumbite (MP) hexaaluminates with a high-substituted concentration have rarely been investigated. LaFexAl12-xO19 catalysts at various Fe loadings (x = 0-12) were synthesized by coprecipitation. Thermal evolution of the samples from 700 up to 1400 degrees C has been followed by X-ray diffractometry. Fe distribution in different crystallographic sites in the final MP structure was clarified by means of Rietveld refinement and room-temperature and low-temperature Fe-57 Mossbauer spectroscopy. The results showed that Fe doping (x = 1-9) lowered the threshold temperature of La-hexaaluminates. When x >= 6, the segregation of LaFeO3 intermediates essentially hindered the formation of monophasic MP phase and even led to the absence of the MP structure when x = 12. Compared with the unsubstituted sample, Fe-substituted La-hexaaluminates (x <= 11) were more stoichiometric. When x = 1-3, Fe preferentially entered the Al(2) sites within spinet blocks and the Al(3) and Al(5) sites in mirror planes. Increasing x to >= 4, Al(1) and Al(4) sites in the spinel block started to be systematically occupied up to x = 11. The reasonably constant turnover frequencies ((0.16 to 0.47) x 10(2) h(-1) m(-2)) indicated a correlation between the N2O catalytic decomposition performance and Fe3+. ions in the mirror plane (Al(3), Al(5)).
关键词[WOS]: TEMPERATURE CATALYTIC COMBUSTION ;  BARIUM HEXAALUMINATE ;  SUBSTITUTED BA-BETA-AL2O3 ;  MAGNETIC-PROPERTIES ;  CATION VALENCE ;  MOSSBAUER ;  METHANE ;  N2O ;  MN ;  DECOMPOSITION
语种: 英语
WOS记录号: WOS:000336509400031
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/145767
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.NW Univ Xian, Coll Chem Engn, Xian 710069, Peoples R China

Recommended Citation:
Zhang, Yan,Wang, Xiaodong,Zhu, Yanyan,et al. Thermal Evolution Crystal Structure and Fe Crystallographic Sites in LaFexAl12-xO19 Hexaaluminates[J]. JOURNAL OF PHYSICAL CHEMISTRY C,2014,118(20):10792-10804.
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