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- W2079142649 abstract "Recently, many charge-ordered compounds containing mixed-valence transition metal ions have been considered as possible multiferroics. Theoretically it has been proposed that charge (orbital) ordering could generate “electronic ferroelectricity” in some of these compounds. Experimentally, temperature- and frequency-dependent high permittivity is commonly presented as evidence of ferroelectricity in these materials. Here, systematic impedance spectroscopy studies on Y0.5Ca0.5MnO3 and La1.5Sr0.5NiO4 ceramics reveal, however, the high permittivity and its temperature- and frequency-dependence over the ranges of 10–300 K and 10 Hz–1 MHz, respectively, are mainly associated with an extrinsic non-ohmic sample-electrode contact effect, rather than an intrinsic response. A general strategy to distinguish the intrinsic dielectric properties of these charge-ordered compounds from extrinsic contributions using impedance spectroscopy is also demonstrated." @default.
- W2079142649 created "2016-06-24" @default.
- W2079142649 creator A5022998379 @default.
- W2079142649 creator A5024429358 @default.
- W2079142649 date "2012-03-01" @default.
- W2079142649 modified "2023-10-18" @default.
- W2079142649 title "The extrinsic origins of high permittivity and its temperature and frequency dependence in Y<sub>0.5</sub>Ca<sub>0.5</sub>MnO<sub>3</sub> and La<sub>1.5</sub>Sr<sub>0.5</sub>NiO<sub>4</sub> ceramics" @default.
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- W2079142649 doi "https://doi.org/10.1063/1.3692607" @default.
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