Affordable Access

Publisher Website

Electronic conductivity in the Pr1− xSrxCo1− yMnyO3−δsystem

Solid State Ionics
Publication Date
DOI: 10.1016/s0167-2738(98)00193-3
  • Praseodymium Manganite
  • Praseodymium Cobaltite
  • Perovskite
  • Electronic Conductivity
  • Polaron Trapping


Abstract The effect of Mn substitution for Co and of Sr doping for Pr on the electronic conductivity of Pr 1− x Sr x Co 1− y Mn y O 3−δ ( x=0.3, 0.5, 0≤ y≤1) was investigated. All oxides have an orthorhombic GdFeO 3-type structure (space group Pbnm), as determined by XRD. The pseudo-cubic lattice constant increases with increasing Mn content. The electrical conductivity was measured in the temperature range from 100 to 800°C in air. The substitutionally-mixed compositions exhibit a semiconducting behavior, where the small polaron hopping conductivity model applies. The normalized conductivity shows a sharp decrease when y increases in the range 0< y<0.4, and it reaches a minimum in the range 0.4< y<0.6. The small polaron is trapped at the energetically lower Mn sites, and the slow transition rate to a neighboring Co site dominates the hopping process. At higher y values, the hopping proceeds among adjacent Mn sites, and as a result, an increase of conductivity is observed. The calculated activation energy values agree with the above mechanism.

There are no comments yet on this publication. Be the first to share your thoughts.


Seen <100 times

More articles like this

The Perovskite Oxide System Pr1− xSrxCo1− yMnyO3-...

on Journal of the European Cerami... Jan 01, 1998

Mixed ionic-electronic conductivity of La1−xSrxCo1...

on Materials Research Bulletin Jan 01, 1988

Substitution of La and Fe with Dy and Mn in multif...

on Journal of Magnetism and Magne...
More articles like this..