Effect of bismuth doping on the structural, magnetic, electrical, and thermopower behavior of lanthanum silver manganites

The structural, magnetic, electrical, and thermoelectric behaviors of lanthanum silver manganite and lanthanum bismuth silver manganite were thoroughly studied in the present work. Two polycrystalline samples, viz., La 0.835 Ag 0.165 MnO 3 (LAMO) and La 0.67 Bi 0.165 Ag 0.165 MnO 3 (LBAMO) possessin...

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Bibliographic Details
Published in:Journal of materials science. Materials in electronics 2020-09, Vol.31 (18), p.15931-15942
Main Authors: Lakshmi, Y. Kalyana, Kumar, K. V. Siva, Ganesan, V., Reddy, P. Venugopal
Format: Article
Language:English
Subjects:
Bismuth
Characterization and Evaluation of Materials
Chemical synthesis
Chemistry and Materials Science
Crystals
Electrical resistivity
Electron spin
Ferromagnetism
High temperature
Lanthanum
Low temperature
Magnetoresistance
Magnetoresistivity
Magnons
Manganites
Materials Science
Optical and Electronic Materials
Phase separation
Phase transitions
Seebeck effect
Structural analysis
Temperature dependence
Thermoelectricity
Transition temperature
X ray powder diffraction
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Summary:The structural, magnetic, electrical, and thermoelectric behaviors of lanthanum silver manganite and lanthanum bismuth silver manganite were thoroughly studied in the present work. Two polycrystalline samples, viz., La 0.835 Ag 0.165 MnO 3 (LAMO) and La 0.67 Bi 0.165 Ag 0.165 MnO 3 (LBAMO) possessing almost constant ratio of Mn 3+ /Mn 4+ were synthesized using the wet chemical method. Phase formation was identified from powder X-ray diffraction and it has been confirmed through the structural analysis of which samples crystallize into rhombohedral symmetry with R-3C space group. Apparent changes at phase transition temperature were observed in temperature-dependent resistivity, magnetization and thermoelectric power behavior for bismuth-doped samples. In addition, an enhanced magnetoresistance was observed in LBAMO samples and is attributed to the presence of both ferromagnetic and anti-ferromagnetic states. The temperature-dependent resistivity data in the temperature range (50–300 K) were analyzed using the phase separation model. Spin-dependent scattering and electron–electron interactions were considered to explain the resistivity minimum in the low temperature region ( T  
ISSN:0957-4522
1573-482X
DOI:10.1007/s10854-020-04154-4