Synthesis and microstructural properties of mixed iron–gallium oxides
Synthesis and microstructural properties of mixed iron–gallium oxides
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DOI：
10.1016/j.jallcom.2015.02.065
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发表时间：
2015-06
影响因子：
6.2
通讯作者：
S. Krehula;M. Ristić;S. Kubuki;Y. Iida;M. Perović;M. Fabián;S. Musić
中科院分区：
文献类型：
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作者：
S. Krehula;M. Ristić;S. Kubuki;Y. Iida;M. Perović;M. Fabián;S. Musić
以混合Fe-Ga氧化物前驱体(α-Fe1−xGaxOOH固溶体，0⩽x⩽O3)为原料，在500℃和10 0 0℃下焙烧制备了各种混合Fe-Ga氧化物.等结构刚玉型氧化物α-Fe2 O3和α-Ga2 O3及其固溶体α-Fe2−xGaO3在整个浓度范围(x=0.4，0.4，1，1.6和2)通过500℃焙烧得到了晶胞尺寸减小，超细磁场减弱，Morin相变，跃迁和相变消失的α-Fe2−xGaxO3低温下磁化强度增加，红外光谱谱带位置向高波数移动，UV-VIS-NIR光谱中吸收带强度降低。Fe-Ga氢氧化物在1000℃焙烧后，生成了三方相α-Fe_2-−_xGa_xO_3。Fe：Ga摩尔比为1：1的Fe-Ga混合氢氧化物在1000℃下焙烧得到单斜相β-Fe_2-−_xGa_xO_3(x=11.6和2)。单斜晶系β-Ga1.6Fe0.403在荧光光谱的蓝区有两个较强的发光峰。
Various mixed Fe–Ga oxides were prepared by the calcination of mixed Fe–Ga oxyhydroxide precursors (α-Fe1−xGaxOOH solid solutions, 0 ⩽x⩽ 1) at 500 or 1000 °C. Isostructural corundum-type oxides α-Fe2O3and α-Ga2O3, as well as their solid solutions α-Fe2−xGaxO3in the entire concentration range (x= 0, 0.4, 1, 1.6 and 2) were prepared by calcination at 500 °C. An increase in the Ga content in α-Fe2−xGaxO3resulted in a reduction of the unit cell size, a weakened hyperfine magnetic field, a disappearance of the Morin transition, an increase of magnetization at low temperatures, a shift in the position of IR bands to higher wavenumbers, and a lower intensity of absorption bands in the UV–Vis-NIR spectra. The calcination of Fe–Ga oxyhydroxides at 1000 °C resulted in the formation of a rhombohedral α-Fe2−xGaxO3phase forx= 0 and 0.4. An orthorhombic GaFeO3phase with Fe3+cations located in 3 different octahedral sites was obtained by the calcination at 1000 °C of mixed Fe–Ga oxyhydroxide with the Fe:Ga ratio of 1:1. A monoclinic phase β-Fe2−xGaxO3(x= 1.6 and 2) was obtained by the calcination at 1000 °C of Fe–Ga oxyhydroxides with 80 and 100 mol% Ga. The monoclinic β-Ga1.6Fe0.4O3showed two strong luminescence peaks in the blue region of the PL spectrum.