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000865929 1001_ $$0P:(DE-Juel1)130504$$aAngst, Manuel$$b0$$eCorresponding author$$ufzj
000865929 245__ $$aIntrinsic Ferroelectricity in Charge-Ordered Magnetite
000865929 260__ $$aBasel$$bMDPI$$c2019
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000865929 520__ $$aSingle crystalline magnetite Fe 3 O 4 was investigated at low temperatures in the charge ordered state by electric measurements and time-resolved diffraction with voltage applied in-situ. Dielectric spectroscopy indicates relaxor ferroelectric characteristics, with polarization switching observably only at sufficiently low temperatures and in a suitably chosen time-window. PUND measurements with a ms time scale indicate a switchable polarization of about 0.6μC/cm2 . Significant switching occurs only above a threshold field of about 3kV/mm , and it occurs with a time delay of about 20μs . The time-resolved diffraction experiment yields, for sufficiently high voltage pulses, a systematic variation by about 0.1 % of the intensity of the ( 2,2¯,10¯¯¯¯ ) Bragg reflection, which is attributed to structural switching of domains of the non-centrosymmetric Cc structure to its inversion twins, providing proof of intrinsic ferroelectricity in charge ordered magnetite.
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000865929 7001_ $$0P:(DE-Juel1)138450$$aAdiga, Shilpa$$b1
000865929 7001_ $$0P:(DE-HGF)0$$aGorfman, Semen$$b2
000865929 7001_ $$0P:(DE-HGF)0$$aZiolkowski, Michael$$b3
000865929 7001_ $$0P:(DE-HGF)0$$aStrempfer, Jörg$$b4
000865929 7001_ $$0P:(DE-HGF)0$$aGrams, Christoph$$b5
000865929 7001_ $$0P:(DE-HGF)0$$aPietsch, Manuel$$b6
000865929 7001_ $$0P:(DE-HGF)0$$aHemberger, Joachim$$b7
000865929 773__ $$0PERI:(DE-600)2661516-2$$a10.3390/cryst9110546$$n11$$p546$$tCrystals$$v9$$x2073-4352$$y2019
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