Burned Rice Husk: An Effective Additive for Enhancing the Electromagnetic Properties of MgB^sub 2^ Superconductor

We investigated the effect of doping of burned rice husk which contains ultrafine ... and highly reactive carbon, on the crystal lattice and superconducting properties of ... 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 ... lattice and the formation of intragrain nanoinclusions in ... From ... (H) characteristics, doped samples show a drastic enhancement of ... compared with pure ... The enhancement of in-field ... values is due to the flux pinning on lattice defects produced by C substitution and nanoscale inclusions of impurity phases. (ProQuest: ... denotes formulae/symbols omitted.)