Room temperature properties of microstructure and resistivity of alkaline earth – doped on lanthanide manganite

• Published in: ITM web of conferences Vol. 61; p. 1024
• Main Authors: Nanto, Dwi, Adella, Desty, Tjahjono, Arif, Saptari, Sitti Ahmiatri, Budiawanti, Sri, Imaduddin, Agung
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Les Ulis EDP Sciences 2024
• Subjects: Atomic radius; Crystal lattices; Crystal structure; Electrical resistivity; Electron microscopes; Grain size; Lanthanum compounds; Lattice parameters; manganite perovskite; Manganites; Microstructure; resistivity; Room temperature; sol-gel; Sol-gel processes; Substitutes; X-ray diffraction
• ISSN: 2271-2097; 2431-7578; 2271-2097
• DOI: 10.1051/itmconf/20246101024

Microstructure of material has a strong relation with resistivity property. Here we report our interesting sample of La
0.7
(Sr
1-
x
Ba
x
)
0.3
MnO
3
(
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 Ba
2+
to Sr
2+
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 Ba
2+
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 Ba
2+
doped into Sr
2+
in lanthanum manganite may cause a wider resistivity range.