Crystal structure and magnetism of colossal dielectric oxides DyxSr2−xTiMnO6 (x = 0‚ 0.5)статья

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Дата последнего поиска статьи во внешних источниках: 6 декабря 2018 г.

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[1] Crystal structure and magnetism of colossal dielectric oxides dyxsr2−xtimno6 (x = 0‚ 0.5) / M. Rajib, B. Kalyan, G. Tapas et al. // Materials Research Express. — 2019. — Vol. 6. — P. 016106. Polycrystalline DyxSr2−xTiMnO6 (x=0, 0.5) double perovskite oxides crystallize in cubic structure (Space group Fm-3m, No. 225) at room temperature. The oxide Sr2TiMnO6 orders antiferromagnetically at∼14 K (TN) below which zero-field-cooled and field-cooled magnetization data show bifurcation. Magnetization of the sample Dy0.5Sr1.5TiMnO6 shows only a tendency to order around 3 K and no clear signature of magnetic ordering. The magnetization value at 2 K is greatly enhanced in the Dy-substituted sample compared to that in parent Sr2TiMnO6. The real part of the dielectric permittivity of both DyxSr2−xTiMnO6 (x=0, 0.5) oxides are of the order of 104 at room temperature. The colossal dielectric constant values in these oxides could be understood in terms of intrinsic hopping conduction and extrinsic Maxwell-Wagner relaxation mechanism. Powder x-ray diffraction data confirm that Sr2TiMnO6 does not undergo any structural transition in the temperature range of 300 K to 800 K and reveal normal thermal expansion behaviour. X-ray photoelectron spectroscopy data on Dy0.5Sr1.5TiMnO6 indeed confirm the presence of mixed valence states forMn (Mn3+ and Mn4+) as expected from magnetization measurements. Thus rare earth ion substitution at Sr-site of Sr2TiMnO6 is a sensitive method to tune the magnetic properties while preserving the colossal dielectric property. [ DOI ]

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