Room Temperature Properties of Microstructure and Resistivity of Alkaline Earth – Doped on Lanthanide Manganite

Nanto Dwi, Adella Desty,Tjahjono Arif,Saptari Sitti Ahmiatri,Budiawanti Sri,Imaduddin Agung

ITM Web of Conferences（2024）

Department of Physics Education | Department of Physics | Research Center for Advanced Material

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Abstract
Microstructure of material has a strong relation with resistivity property. Here we report our interesting sample of La0.7(Sr1-xBax)0.3MnO3 (x = 0, 0.3, 0.6, and 0.9) material that has been synthesized by using sol-gel method successfully. All pattern of X-ray diffractometer (XRD) on the successful samples show that all samples are single phase confirmed without significant crystal disorder. The XRD pattern refinement yield that all samples formed R-3c space group with a rhombohedral structure. Although the substitution of Ba2+ to Sr2+ ions have significant difference in atomic radius; it does not change the crystal structure. However, the alkaline earth – doped on lanthanide manganite causes a change in lattice parameters which is followed by shifted of average crystal size, bond length, cell unit volume and bond angle at Mn-O-Mn. The microstructure results by means of scanning electron microscope (SEM) characterization shows that substitution of Ba2+ ions decrease the grain size and yield agglomeration. The relation on the microscopic result resistively confirmed by cryogenic magnetometer characterization in the concentration x = 0 has minimum resistivity of 1.28.10-3 Ωm and the maximum resistivity in the concentration x = 0.9 is 1.85.10-1 Ωm. The Ba2+ doped into Sr2+ in lanthanum manganite may cause a wider resistivity range.
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Key words
manganite perovskite,sol-gel,grain size,resistivity
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【要点】：研究探讨了碱土金属掺杂对镧系锰酸盐微结构和电阻率的影响，揭示了Ba2+掺杂导致的微结构变化及其对电阻率的显著影响。


【方法】：采用溶胶-凝胶法制备La0.7(Sr1-xBax)0.3MnO3 (x = 0, 0.3, 0.6, 0.9)材料，并通过X射线衍射(XRD)和扫描电子显微镜(SEM)对微结构进行表征，使用低温磁强计测量电阻率。


【实验】：通过XRD确认所有样品为单相，且形成R-3c空间群的菱形结构；SEM结果表明Ba2+掺杂导致晶粒尺寸减小和团聚现象；在x = 0时电阻率最小，为1.28×10^-3 Ωm，而在x = 0.9时电阻率最大，为1.85×10^-1 Ωm，表明Ba2+掺杂扩大了电阻率范围。