TY - JOUR
T1 - Comprehensive study on effect of electron beam irradiation on electrical, thermo-electric and magnetic properties of oxygen rich LaMnO3.15compound
AU - Christopher, Benedict
AU - Rao, Ashok
AU - Okram, G. S.
AU - Chandra Petwal, Vikash
AU - Verma, Vijay Pal
AU - Dwivedi, Jishnu
N1 - Publisher Copyright:
© 2017 Elsevier B.V.
PY - 2017/1/1
Y1 - 2017/1/1
N2 - We report the influence of electron beam (EB) irradiation on the structural, electrical, thermoelectric and magnetic properties of oxygen rich LaMnO3manganite. Refinement of XRD data shows that pristine as well irradiated samples are single phased and exhibit orthorhombic distorted structure (Pbnm) with the orthorhombic deformation slightly increasing with EB dosage. The Mn[sbnd]O bond length increases with increase in EB dosage perhaps due to strain induced by EB irradiation. On contrary, the Mn[sbnd]O[sbnd]Mn bond angle remains unchanged for the irradiated samples. Electrical resistivity results shows that the small polaron hopping model is valid in the high temperature regime for all the samples. The pristine sample shows a small metal-insulator transition region around the characteristic temperature TMI, however EB irradiation induces a sharper metal-insulator transition behavior. The temperature dependence of Seebeck coefficient (S) of the pristine sample displays a crossover from positive to negative value as the sample is cooled whereas the irradiated samples exhibit only positive values. The Seebeck coefficient data is consistent with the resistivity data in the sense that the SPH model is valid in high temperature region. The magnetic measurements confirm the existence of short-range FM interaction above TCand all the samples follow Curie-Weiss law in the paramagnetic state.
AB - We report the influence of electron beam (EB) irradiation on the structural, electrical, thermoelectric and magnetic properties of oxygen rich LaMnO3manganite. Refinement of XRD data shows that pristine as well irradiated samples are single phased and exhibit orthorhombic distorted structure (Pbnm) with the orthorhombic deformation slightly increasing with EB dosage. The Mn[sbnd]O bond length increases with increase in EB dosage perhaps due to strain induced by EB irradiation. On contrary, the Mn[sbnd]O[sbnd]Mn bond angle remains unchanged for the irradiated samples. Electrical resistivity results shows that the small polaron hopping model is valid in the high temperature regime for all the samples. The pristine sample shows a small metal-insulator transition region around the characteristic temperature TMI, however EB irradiation induces a sharper metal-insulator transition behavior. The temperature dependence of Seebeck coefficient (S) of the pristine sample displays a crossover from positive to negative value as the sample is cooled whereas the irradiated samples exhibit only positive values. The Seebeck coefficient data is consistent with the resistivity data in the sense that the SPH model is valid in high temperature region. The magnetic measurements confirm the existence of short-range FM interaction above TCand all the samples follow Curie-Weiss law in the paramagnetic state.
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U2 - 10.1016/j.jallcom.2017.01.229
DO - 10.1016/j.jallcom.2017.01.229
M3 - Article
AN - SCOPUS:85011554721
SN - 0925-8388
VL - 703
SP - 216
EP - 224
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
ER -