Nickel manganite powder synthesized by calcination of a stoichiometric mixture of manganese and nickel oxide was additionally mechanically activated in a high energy planetary ball mill for 5-60 min in order to obtain a pure NiMn2O4 phase. The as-prepared powders were uniaxially pressed into disc shape pellets and then sintered for 60 min at 1200 degrees C. Changes in the particle morphology induced by mechanical activation were monitored using scanning electron microscopy, while changes in powder structural characteristics were followed using X-ray powder diffraction. The ac impedance spectroscopy was performed on sintered nickel manganite samples at 25 degrees C, 50 degrees C and 80 degrees C. It was shown that mechanical activation intensifies transport processes causing a decrease in the average crystallites size, while longer activation times can lead to the formation of aggregates, defects and increase of lattice microstrains. The observed changes in microstructures were correlat...ed with measured electrical properties in order to define optimal processing conditions.
TY - JOUR
AU - Savić, Slavica M.
AU - Mančić, Lidija T
AU - Vojisavljević, Katarina
AU - Stojanović, Goran M
AU - Branković, Zorica
AU - Aleksić, Obrad
AU - Branković, Goran
PY - 2011
UR - http://rimsi.imsi.bg.ac.rs/handle/123456789/449
AB - Nickel manganite powder synthesized by calcination of a stoichiometric mixture of manganese and nickel oxide was additionally mechanically activated in a high energy planetary ball mill for 5-60 min in order to obtain a pure NiMn2O4 phase. The as-prepared powders were uniaxially pressed into disc shape pellets and then sintered for 60 min at 1200 degrees C. Changes in the particle morphology induced by mechanical activation were monitored using scanning electron microscopy, while changes in powder structural characteristics were followed using X-ray powder diffraction. The ac impedance spectroscopy was performed on sintered nickel manganite samples at 25 degrees C, 50 degrees C and 80 degrees C. It was shown that mechanical activation intensifies transport processes causing a decrease in the average crystallites size, while longer activation times can lead to the formation of aggregates, defects and increase of lattice microstrains. The observed changes in microstructures were correlated with measured electrical properties in order to define optimal processing conditions.
PB - Pergamon-Elsevier Science Ltd, Oxford
T2 - Materials Research Bulletin
T1 - Microstructural and electrical changes in nickel manganite powder induced by mechanical activation
EP - 1071
IS - 7
SP - 1065
VL - 46
DO - 10.1016/j.materresbull.2011.03.008
ER -
@article{
author = "Savić, Slavica M. and Mančić, Lidija T and Vojisavljević, Katarina and Stojanović, Goran M and Branković, Zorica and Aleksić, Obrad and Branković, Goran",
year = "2011",
abstract = "Nickel manganite powder synthesized by calcination of a stoichiometric mixture of manganese and nickel oxide was additionally mechanically activated in a high energy planetary ball mill for 5-60 min in order to obtain a pure NiMn2O4 phase. The as-prepared powders were uniaxially pressed into disc shape pellets and then sintered for 60 min at 1200 degrees C. Changes in the particle morphology induced by mechanical activation were monitored using scanning electron microscopy, while changes in powder structural characteristics were followed using X-ray powder diffraction. The ac impedance spectroscopy was performed on sintered nickel manganite samples at 25 degrees C, 50 degrees C and 80 degrees C. It was shown that mechanical activation intensifies transport processes causing a decrease in the average crystallites size, while longer activation times can lead to the formation of aggregates, defects and increase of lattice microstrains. The observed changes in microstructures were correlated with measured electrical properties in order to define optimal processing conditions.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Materials Research Bulletin",
title = "Microstructural and electrical changes in nickel manganite powder induced by mechanical activation",
pages = "1071-1065",
number = "7",
volume = "46",
doi = "10.1016/j.materresbull.2011.03.008"
}
Savić, S. M., Mančić, L. T., Vojisavljević, K., Stojanović, G. M., Branković, Z., Aleksić, O.,& Branković, G.. (2011). Microstructural and electrical changes in nickel manganite powder induced by mechanical activation. in Materials Research Bulletin
Pergamon-Elsevier Science Ltd, Oxford., 46(7), 1065-1071.
https://doi.org/10.1016/j.materresbull.2011.03.008
Savić SM, Mančić LT, Vojisavljević K, Stojanović GM, Branković Z, Aleksić O, Branković G. Microstructural and electrical changes in nickel manganite powder induced by mechanical activation. in Materials Research Bulletin. 2011;46(7):1065-1071.
doi:10.1016/j.materresbull.2011.03.008 .
Savić, Slavica M., Mančić, Lidija T, Vojisavljević, Katarina, Stojanović, Goran M, Branković, Zorica, Aleksić, Obrad, Branković, Goran, "Microstructural and electrical changes in nickel manganite powder induced by mechanical activation" in Materials Research Bulletin, 46, no. 7 (2011):1065-1071,
https://doi.org/10.1016/j.materresbull.2011.03.008 . .
