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Low temperature synthesis and characterization of rare earth orthoferrites LnFeO(3) (Ln = La, Pr and Nd) from molten NaOH flux

机译:熔融氢氧化钠熔剂的低温合成和稀土稀土铁氧体LnFeO(3)(Ln = La,Pr和Nd)的表征

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Rare earth orthoferrites of the general formula LnFeO(3) (Ln = La, Pr and Nd) phases have been synthesized for the first time in molten NaOH flux at a temperature as low as 400 degrees C. The flux-grown oxides were characterized by XRD, SEM, EDX, FT-IR and temperature dependent electrical resistivity measurements. The crystal structures of these materials have been refined by the Rietveld profile analysis method using powder XRD data. All these oxides crystallize in the orthorhombic structure (space group Pbnm, no. 62) and exhibit insulating behavior. As-synthesized samples show three active IR absorption bands for Fe-O stretching vibration (v(1) mode) and O-Fe-O deformation vibration (v(2) mode). In the KOH flux on the other hand, no product formation is observed, thus providing evidence for the differences in the two alkali fluxes. (c) 2006 Elsevier Ltd. All rights reserved.
机译:通式为LnFeO(3)(Ln = La,Pr和Nd)的稀土正铁氧体是在低至400摄氏度的熔融NaOH助熔剂中首次合成的。助熔剂生长的氧化物的特征在于XRD,SEM,EDX,FT-IR和温度相关的电阻率测量。这些材料的晶体结构已通过Rietveld轮廓分析法使用粉末XRD数据进行了精炼。所有这些氧化物都在正交结构(空间群Pbnm,编号62)中结晶并表现出绝缘行为。合成样品显示出三个活动的红外吸收带,分别用于Fe-O拉伸振动(v(1)模式)和O-Fe-O变形振动(v(2)模式)。另一方面,在KOH通量中,未观察到产物形成,因此提供了两种碱通量差异的证据。 (c)2006 Elsevier Ltd.保留所有权利。

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