Shape controllable synthesis of NdFeO3 micro single crystals by a hydrothermal route
Shape controllable synthesis of NdFeO3 micro single crystals by a hydrothermal route
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水热法形貌可控合成 NdFeO3 微单晶
DOI：
10.1039/c3ce41434e
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发表时间：
2014-02
期刊：
影响因子：
--
通讯作者：
Xianran Xing
中科院分区：
文献类型：
--
作者：
You Wang;Xuecheng Yan;Jun Chen;Jinxia Deng;Ranbo Yu;Xianran Xing
采用水热法合成了形貌和尺寸可控的正交晶系NdFeO 3（空间群：Pnma）晶体。最终产物的形貌强烈依赖于碱的浓度。当KOH溶液的浓度从16 M调节到19 M时，分别得到了长方体、十字形和棒状的NdFeO 3晶体。棒状NdFeO 3晶体沿[010]方向择优取向，取向方向为沿着。NdFeO 3晶体的形成可以用“溶解-沉淀”机制来解释。研究发现，在水热处理前先离心分离沉淀物，然后与KOH溶液混合，再加入适量的KNO 3，可以得到高长径比、小尺寸的棒状NdFeO 3晶体。并对不同形状的NdFeO_3晶体的磁性进行了研究。
Orthorhombic NdFeO3 (space group: Pnma) crystals with controlled morphologies and sizes were synthesized via a hydrothermal method. The morphologies of the final products strongly depend on the concentration of alkali. When the concentration of the KOH solution was adjusted from 16 M to 19 M, cuboid, cross-shaped and bar-shaped NdFeO3 crystals were obtained respectively. The bar-shaped NdFeO3 crystals are preferentially oriented along the direction of [010]. The formation of NdFeO3 crystals can be explained by a “dissolution–precipitation” mechanism. It is interesting to find that if the precipitates are isolated by centrifugation before hydrothermal treatment, then mixed with KOH solutions, followed by adding an appropriate amount of KNO3, the rod-shaped NdFeO3 crystals with high aspect ratio and small size will be obtained in the hydrothermal route. The magnetic properties of NdFeO3 crystals with different shapes were also explored.
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