Advertisement

Burned Rice Husk: An Effective Additive for Enhancing the Electromagnetic Properties of MgB2 Superconductor

Authors

  • Neson Varghese,

    1. National Institute for Interdisciplinary Science and Technology (CSIR), Trivandrum 695019, India
    Search for more papers by this author
  • Krishnankutty Vinod,

    1. National Institute for Interdisciplinary Science and Technology (CSIR), Trivandrum 695019, India
    Search for more papers by this author
  • Shipra,

    1. Chemistry and Physics of Materials Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bangalore 560 064, India
    Search for more papers by this author
  • Athinarayanan Sundaresan,

    1. Chemistry and Physics of Materials Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bangalore 560 064, India
    Search for more papers by this author
  • Upendran Syamaprasad

    Corresponding author
    1. National Institute for Interdisciplinary Science and Technology (CSIR), Trivandrum 695019, India
      †Author to whom correspondence should be addressed. e-mail: syamcsir@gmail.com
    Search for more papers by this author

  • D. Johnson—contributing editor

†Author to whom correspondence should be addressed. e-mail: syamcsir@gmail.com

Abstract

We investigated the effect of doping of burned rice husk which contains ultrafine SiO2 and highly reactive carbon, on the crystal lattice and superconducting properties of MgB2 superconductor prepared by an in situ powder in sealed tube method. XRD, TEM, and magnetic measurements confirm the substitution of carbon atoms at boron sites in the MgB2 lattice and the formation of intragrain nanoinclusions in MgB2. From JC (H) characteristics, doped samples show a drastic enhancement of JC compared with pure MgB2. The enhancement of in-field JC values is due to the flux pinning on lattice defects produced by C substitution and nanoscale inclusions of impurity phases.

Ancillary