Palladium-based ferroelectrics and multiferroics : theory and experiment
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.
Citation
Kumari , S , Pradhan , D K , Ortega , N , Pradhan , K , DeVreugd , C , Srinivasan , G , Kumar , A , Paudel , T R , Tsymbal , E Y , Bumstead , A , Scott , J F & Katiyar , R S 2017 , ' Palladium-based ferroelectrics and multiferroics : theory and experiment ' , Physical Review. B, Condensed matter and materials physics , vol. 95 , no. 21 , 214109 . https://doi.org/10.1103/PhysRevB.95.214109
Publication
Physical Review. B, Condensed matter and materials physics
Status
Peer reviewed
ISSN
1098-0121Type
Journal article
Collections
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