<abstract xml:lang="en" xmlns="http://www.w3.org/1999/xhtml"><p>Monophasic mullite samples doped with 0.002 M, 0.02 M, 0.1 M, 0.15 M and 0.2 M of NiCl2 were prepared via sol-gel technique. The prepared gels were dried, grinded, pressed into pellets and sintered at 400 °C, 800 °C, 1000 °C and 1300 °C. The electrical resistivity and activation energy of the composites have been measured and the variation of resistivity with concentration of the nickel ion doping has been investigated. The resistivity decreases with the concentration of nickel ions. X-ray analysis confirms the presence of Ni2+ ions in mullite. The Ni2+ ion, which substitutes Al3+ ion in the octahedral site of mullite structure, can be considered as an efficient factor in reducing the resistivity. The mullite unit cell parameters suggest predominant incorporation of NiCl2 in a glassy phase. The lowest activation energy of resistivity (E
                        act) that was achieved is 1.22 eV at 0.02 M.</p></abstract>

Monophasic mullite samples doped with 0.002 M, 0.02 M, 0.1 M, 0.15 M and 0.2 M of NiCl2 were prepared via sol-gel technique. The prepared gels were dried, grinded, pressed into pellets and sintered at 400 °C, 800 °C, 1000 °C and 1300 °C. The electrical resistivity and activation energy of the composites have been measured and the variation of resistivity with concentration of the nickel ion doping has been investigated. The resistivity decreases with the concentration of nickel ions. X-ray analysis confirms the presence of Ni2+ ions in mullite. The Ni2+ ion, which substitutes Al3+ ion in the octahedral site of mullite structure, can be considered as an efficient factor in reducing the resistivity. The mullite unit cell parameters suggest predominant incorporation of NiCl2 in a glassy phase. The lowest activation energy of resistivity (E
                        act) that was achieved is 1.22 eV at 0.02 M.

Possibility of decreasing the activation energy of resistivity of mullite by doping with nickel ion

Physics Department, Jadavpur University, Kolkata, 700 032, India

Materials Science-Poland

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Monophasic mullite samples doped with 0.002 M, 0.02 M, 0.1 M, 0.15 M and 0.2 M of NiCl2 were prepared via sol-gel technique. The prepared gels were dried,...

Possibility of decreasing the activation energy of resistivity of mullite by doping with nickel ion

Published Online: Dec 14, 2012

Page range: 406 - 413

DOI: https://doi.org/10.2478/s13536-012-0049-5

Keywords
nanocomposite, sol-gel methods, scanning electron microscopy (SEM), X-ray diffraction (XRD), electrical resistivity

© 2012 Wroclaw University of Technology

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Possibility of decreasing the activation energy of resistivity of mullite by doping with nickel ion

Published Online: Dec 14, 2012

Page range: 406 - 413

DOI: https://doi.org/10.2478/s13536-012-0049-5

Keywordsnanocomposite, sol-gel methods, scanning electron microscopy (SEM), X-ray diffraction (XRD), electrical resistivity

© 2012 Wroclaw University of Technology

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Keywords
nanocomposite, sol-gel methods, scanning electron microscopy (SEM), X-ray diffraction (XRD), electrical resistivity