Destabilization of the 6H-SrIrO 3 polymorph through partial substitution of zinc and lithium

M. Bremholm, C. K. Yim, D. Hirai, E. Climent-Pascual, Q. Xu, H. W. Zandbergen, M. N. Ali, Robert Joseph Cava

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Abstract

We report on the destabilization of the 6H-SrIrO 3 polymorph through partial substitutions of zinc and lithium for iridium to form perovskites. The perovskites crystallize in the orthorhombic space group Pbnm: SrIr 1-xZn xO 3 is found for 0.25 ≤ x ≤ 0.33, while SrIr 1-xLi xO 3 is found only for x = 0.25. The Zn and Li ions are randomly distributed in the B-site lattice. Analysis shows that the perovskite stabilization is not driven by changes in average ionic size but rather is due to destabilization of the face-sharing octahedra that are present in 6H-type SrIrO 3. Magnetic susceptibility measurements show Curie-Weiss behavior, with relatively large temperature independent contributions, and that the iridium atoms have low effective moments, 0.52 to 1.08 μ B per Ir. The resistivity of SrIr 0.67Zn 0.33O 3, characterized by Mott variable range hopping type semiconducting behavior, indicates that substituted Zn ions introduce significant disorder into the system. SrIr 0.75Li 0.25O 3 has a significant linear contribution to the specific heat at low temperatures.

Original languageEnglish (US)
Pages (from-to)16431-16436
Number of pages6
JournalJournal of Materials Chemistry
Volume22
Issue number32
DOIs
StatePublished - Aug 28 2012

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Chemistry

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    Bremholm, M., Yim, C. K., Hirai, D., Climent-Pascual, E., Xu, Q., Zandbergen, H. W., Ali, M. N., & Cava, R. J. (2012). Destabilization of the 6H-SrIrO 3 polymorph through partial substitution of zinc and lithium. Journal of Materials Chemistry, 22(32), 16431-16436. https://doi.org/10.1039/c2jm32558f