Palladium-based ferroelectrics and multiferroics: theory and experiment

Shalini Kumari, Dhiren K. Pradhan, Nora Ortega, Kallol Pradhan, Christopher DeVreugd, Gopalan Srinivasan, Ashok Kumar, Tula R. Paudel, Evgeny Y. Tsymbal, Alice Bumstead, James Floyd Scott, Ram S. Katiyar

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

Palladium normally does not easily substitute for Ti or Zr in perovskite oxides. Moreover, Pd is not normally magnetic (but becomes ferromagnetic under applied uniaxial stress or electric fields). Despite these two great obstacles, we have succeeded in fabricating lead zirconate titanate with 30% Pd substitution. For 20:80 Zr:Ti the ceramics are generally single-phase perovskite (>99%), but sometimes exhibit 1% PbPdO2, which is magnetic below T=90K. The resulting material is multiferroic (ferroelectric-ferromagnet) at room temperature. The processing is slightly unusual (>8 hrs in high-energy ball-milling in Zr balls), and the density functional theory provided shows that it occurs because of Pd+4 in the oversized Pb+2 site; if all Pd+4 were to go into the Ti+4 perovskite B-site, no magnetism would result.
Original languageEnglish
Article number214109
Number of pages9
JournalPhysical Review. B, Condensed matter and materials physics
Volume95
Issue number21
DOIs
Publication statusPublished - 14 Jun 2017

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