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Investigation of structural, optical, electrical, and magnetic properties of Fe‐doped La0.7Sr0.3MnO3 manganites
International Journal of Applied Ceramic Technology ( IF 1.8 ) Pub Date : 2020-05-26 , DOI: 10.1111/ijac.13540 Abdullah Ameen Saad Hassan 1 , Wasi Khan 2 , Shahid Husain 2 , Pooja Dhiman 3 , Mahavir Singh 3
International Journal of Applied Ceramic Technology ( IF 1.8 ) Pub Date : 2020-05-26 , DOI: 10.1111/ijac.13540 Abdullah Ameen Saad Hassan 1 , Wasi Khan 2 , Shahid Husain 2 , Pooja Dhiman 3 , Mahavir Singh 3
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In this work, the physical properties of nanocrystalline samples of La0.7Sr0.3Mn1−xFexO3 (0.0 ≤ x ≤ 0.20) perovskite manganites synthesized by the reverse micelle (RM) technique were explored in detail. The phase purity, crystal structure, and crystallite size of the samples were determined using X‐ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopy. All the samples had rhombohedral crystal structure and crystallite size increased with increase in Fe content in La0.7Sr0.3MnO3. The scanning electron micrographs (SEMs) exhibited smooth surface morphology and nonuniform shape of the particles. The optical properties studied using UV‐visible absorption spectroscopy revealed a decrease in the absorbance and optical band gap with an increase in Fe content in La0.7Sr0.3MnO3 compound. The temperature‐dependent resistivity measurements revealed semiconducting nature of x = 0 and 0.1 samples up to the studied temperature range, while a metal‐to‐insulator transition was observed at higher Fe doping. Magnetic studies revealed weak ferromagnetism in all the samples and a reduction in the maximum magnetization with an increase in Fe content. A close correlation between electrical transport and magnetic properties was observed with the doping of Fe ion in La0.7Sr0.3MnO3 at Mn site. These results advocate strong interactions associated with the double exchange mechanism among Fe3+ and Mn3+ ions.
中文翻译：
掺铁的La0.7Sr0.3MnO3锰矿的结构，光学，电和磁性能研究
在这项工作中，La中的纳米晶样品的物理性能0.7锶0.3的Mn 1- X的Fe X ø 3（0.0≤ X ≤0.20）钙钛矿锰氧化物通过反胶束（RM）技术合成详细进行了探索。使用X射线衍射（XRD）和傅里叶变换红外（FTIR）光谱仪确定样品的相纯度，晶体结构和微晶尺寸。所有样品均具有菱面体晶体结构，且随着La 0.7 Sr 0.3 MnO 3中Fe含量的增加，晶粒尺寸增大。。扫描电子显微照片（SEM）显示出光滑的表面形态和颗粒的不均匀形状。使用紫外可见吸收光谱法研究的光学性质表明，随着La 0.7 Sr 0.3 MnO 3化合物中Fe含量的增加，吸光度和光学带隙减小。与温度有关的电阻率测量结果显示出x的半导体性质 = 0和0.1个样品，直至研究的温度范围，而在较高的Fe掺杂下观察到金属向绝缘体的转变。磁性研究表明，所有样品中的铁磁性均较弱，并且最大磁化强度随铁含量的增加而降低。观察到在Fe位点处的La 0.7 Sr 0.3 MnO 3中的Fe离子掺杂与电传输和磁性能之间密切相关。这些结果提倡与Fe 3+和Mn 3+离子的双重交换机制相关的强相互作用。
更新日期：2020-05-26
中文翻译：
掺铁的La0.7Sr0.3MnO3锰矿的结构，光学，电和磁性能研究
在这项工作中，La中的纳米晶样品的物理性能0.7锶0.3的Mn 1- X的Fe X ø 3（0.0≤ X ≤0.20）钙钛矿锰氧化物通过反胶束（RM）技术合成详细进行了探索。使用X射线衍射（XRD）和傅里叶变换红外（FTIR）光谱仪确定样品的相纯度，晶体结构和微晶尺寸。所有样品均具有菱面体晶体结构，且随着La 0.7 Sr 0.3 MnO 3中Fe含量的增加，晶粒尺寸增大。。扫描电子显微照片（SEM）显示出光滑的表面形态和颗粒的不均匀形状。使用紫外可见吸收光谱法研究的光学性质表明，随着La 0.7 Sr 0.3 MnO 3化合物中Fe含量的增加，吸光度和光学带隙减小。与温度有关的电阻率测量结果显示出x的半导体性质 = 0和0.1个样品，直至研究的温度范围，而在较高的Fe掺杂下观察到金属向绝缘体的转变。磁性研究表明，所有样品中的铁磁性均较弱，并且最大磁化强度随铁含量的增加而降低。观察到在Fe位点处的La 0.7 Sr 0.3 MnO 3中的Fe离子掺杂与电传输和磁性能之间密切相关。这些结果提倡与Fe 3+和Mn 3+离子的双重交换机制相关的强相互作用。
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