Morphology-controlled synthesis of orthorhombic LuFeO3 particles via a hydrothermal route

Morphology-controlled synthesis of orthorhombic LuFeO3 particles via a hydrothermal route
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通过水热途径形貌控制合成正交 LuFeO3 颗粒

DOI:
10.1016/j.jallcom.2014.08.057
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发表时间:
2014-12
期刊:
Journal of Alloys and Compounds 617 (2014)
影响因子:
--
通讯作者:
J.L. Jiang
J.L. Jiang
中科院分区:
其他
文献类型:
--
作者:
H.M. Zhang;W.J. Feng;Z.Q. Wei;J.L. Jiang

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采用水热法合成了LuFeO_3粒子,系统研究了各种实验参数对产物的影响。X射线衍射分析表明,在反应温度为160~260℃、反应时间为24~60h、氢氧化钠浓度为0.625~6.25mM、Lu3+/Fe3+离子浓度为0.025~0.075 mM的条件下,可以合成单一的o-LuFeO_3样品。扫描电子显微镜观察表明,在较低的温度(160~290℃)和较低的氢氧化钠浓度(0.625~3.75mM)下制备的鲁铁氧化物颗粒呈棒状,且棒材的长径比随温度的升高和氢氧化钠浓度的增加而减小。在相对较高的温度(240-260℃)和较高的NaOH浓度(5-6.25℃)下,生成的LuFeO_3颗粒呈球形、多面体或立方体形状。当温度为220℃,氢氧化钠浓度为2.5-3.75M时,制得的样品具有较大的颗粒尺寸。所有的颗粒都呈层状结构,表明它们主要是由不规则的薄片构成的。与反应温度和NaOH浓度相比,反应时间和Lu3+/Fe3+浓度对LuFeO_3粒子的形貌和尺寸的影响相对较小。所制备的样品具有2.14 eV的带隙能,在室温下表现出一周的铁磁行为。
LuFeO3particles were synthesized via a hydrothermal route, where the influence of various experimental parameters on the products was systematically investigated. XRD analysis reveals that single o-LuFeO3samples can be synthesized at reaction temperatures of 160–260 °C, reaction times of 24–60 h, NaOH concentrations of 0.625–6.25 M, and Lu3+/Fe3+ion concentrations of 0.025–0.075 M. SEM observation shows that LuFeO3particles prepared at relatively low temperatures (160–220 °C) and low NaOH concentrations (0.625–3.75 M) exhibit bar-like shape, and the aspect ratio of the bars decreases with increasing the temperature and NaOH concentration. At relatively high temperatures (240–260 °C) and high NaOH concentrations (5–6.25 M), the resulted LuFeO3particles are shaped like spheres, polyhedrons or cubes. The samples prepared at the temperature of 220 °C and the NaOH concentration of 2.5–3.75 M have a relatively large particle size. All the particles exhibit a layered structure, indicating that they are mainly constructed from irregular sheets. Compared to the reaction temperature and NaOH concentration, the reaction time and Lu3+/Fe3+concentration has a relatively small effect on the morphology and size of LuFeO3particles. The as-prepared LuFeO3samples have a similar bandgap energy of 2.14 eV and exhibit a week ferromagnetic behavior at room temperature.
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发表时间: 2014-02
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