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Thermal Evolution Crystal Structure and Fe Crystallographic Sites in LaFexAl12-xO19 Hexaaluminates
Zhang, Yan1,2; Wang, Xiaodong1; Zhu, Yanyan3; Liu, Xin1; Zhang, Tao1
刊名JOURNAL OF PHYSICAL CHEMISTRY C
2014-05-22
DOI10.1021/jp500682d
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
关键词[WOS]TEMPERATURE CATALYTIC COMBUSTION ; BARIUM HEXAALUMINATE ; SUBSTITUTED BA-BETA-AL2O3 ; MAGNETIC-PROPERTIES ; CATION VALENCE ; MOSSBAUER ; METHANE ; N2O ; MN ; DECOMPOSITION
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)).
语种英语
WOS记录号WOS:000336509400031
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文献类型期刊论文
条目标识符http://cas-ir.dicp.ac.cn/handle/321008/145767
专题中国科学院大连化学物理研究所
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
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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.
APA Zhang, Yan,Wang, Xiaodong,Zhu, Yanyan,Liu, Xin,&Zhang, Tao.(2014).Thermal Evolution Crystal Structure and Fe Crystallographic Sites in LaFexAl12-xO19 Hexaaluminates.JOURNAL OF PHYSICAL CHEMISTRY C,118(20),10792-10804.
MLA Zhang, Yan,et al."Thermal Evolution Crystal Structure and Fe Crystallographic Sites in LaFexAl12-xO19 Hexaaluminates".JOURNAL OF PHYSICAL CHEMISTRY C 118.20(2014):10792-10804.
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