Designing polar and magnetic oxides: Zn₂FeTaO₆ - In search of multiferroics

TY - JOUR

T1 - Designing polar and magnetic oxides

T2 - Zn2FeTaO6 - In search of multiferroics

AU - Li, Man Rong

AU - Stephens, Peter W.

AU - Retuerto, Maria

AU - Sarkar, Tapati

AU - Grams, Christoph P.

AU - Hemberger, Joachim

AU - Croft, Mark C.

AU - Walker, David

AU - Greenblatt, Martha

PY - 2014/6/18

Y1 - 2014/6/18

N2 - Polar oxides are technically of great interest but difficult to prepare. Our recent discoveries predicted that polar oxides can be synthesized in the corundum-derivative A2BB′O6 family with unusually small cations at the A-site and a d0 electron configuration ion at B′-site. When magnetic transition-metal ions are incorporated more interesting polar magnetic oxides can form. In this work we experimentally verified this prediction and prepared LiNbO3 (LN)-type polar magnetic Zn2FeTaO6 via high pressure and temperature synthesis. The crystal structure analysis indicates highly distorted ZnO6 and (Fe/Ta)O6 octahedra, and an estimated spontaneous polarization (PS) of ∼50 μC/cm2 along the c-axis was obtained from point charge model calculations. Zn2Fe3+Ta 5+O6 has a lower magnetic transition temperature (T N ∼ 22 K) than the Mn2FeTaO6 analogue but is less conductive. The dielectric and polarization measurements indicate a potentially switchable component.

AB - Polar oxides are technically of great interest but difficult to prepare. Our recent discoveries predicted that polar oxides can be synthesized in the corundum-derivative A2BB′O6 family with unusually small cations at the A-site and a d0 electron configuration ion at B′-site. When magnetic transition-metal ions are incorporated more interesting polar magnetic oxides can form. In this work we experimentally verified this prediction and prepared LiNbO3 (LN)-type polar magnetic Zn2FeTaO6 via high pressure and temperature synthesis. The crystal structure analysis indicates highly distorted ZnO6 and (Fe/Ta)O6 octahedra, and an estimated spontaneous polarization (PS) of ∼50 μC/cm2 along the c-axis was obtained from point charge model calculations. Zn2Fe3+Ta 5+O6 has a lower magnetic transition temperature (T N ∼ 22 K) than the Mn2FeTaO6 analogue but is less conductive. The dielectric and polarization measurements indicate a potentially switchable component.

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U2 - https://doi.org/10.1021/ja502774v

DO - https://doi.org/10.1021/ja502774v

M3 - Article

SN - 0002-7863

VL - 136

SP - 8508

EP - 8511

JO - Journal of the American Chemical Society

JF - Journal of the American Chemical Society

IS - 24

ER -