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首页> 外文期刊>Zeitschrift fur Naturforschung, B. A Journal of Chemical Sciences >Ferromagnetism in Fe3-x-yNixGeTe2
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Ferromagnetism in Fe3-x-yNixGeTe2

机译：Fe3-x-yNixGeTe2中的铁磁性

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摘要

Polycrystalline samples of Fe3-yGeTe2 (0.08 <= y <= 0.29) and the solid solutions Fe3-x-yNixGeTe2 (0.24 <= x <= 1.32; 0.14 <= y <= 0.41) were synthesized at 898-973 K in a resistance furnace and characterized by X-ray and neutron powder diffraction with Rietveld analysis (Fe3GeTe2 type, P6(3)/mmc, a = 402.665(3), c = 1632.820(14) pm for x = 0, y = 0.08). Fe 3 Ge layers with planar FeGe hexagons and additional iron atoms above and below the rings are separated by double layers of tellurium atoms. Fe3GeTe2 is ferromagnetic below T-C = 230 K with magnetic moments aligned along the c axis. T-C depends on the iron content and decreases with increasing iron vacancies continuously to 153 K in Fe2.71GeTe2. Further reduction of T-C is possible by nickel substitution until magnetic ordering is nearly absent in Fe1.33Ni1.32GeTe2. The suppression of the magnetic ordering is caused by random dilution of the magnetic iron atoms either by vacancies or by non-magnetic nickel atoms.
机译：Fe3-yGeTe2（0.08 <= y <= 0.29）和固溶体Fe3-x-yNixGeTe2（0.24 <= x <= 1.32; 0.14 <= y <= 0.41）的多晶样品在898-973 K下于电阻炉，并通过Rietveld分析（Fe3GeTe2型，P6（3）/ mmc，a = 402.665（3），c = 1632.820（14）pm，x = 0，y = 0.08）进行X射线和中子粉末衍射表征。具有平面FeGe六边形的Fe 3 Ge层以及在环的上方和下方的其他铁原子之间被双层碲原子隔开。 Fe3GeTe2在T-C = 230 K以下时是铁磁性的，其磁矩沿c轴对齐。 T-C取决于铁含量，并且在Fe2.71GeTe2中随着铁空位的增加而连续降低至153K。通过镍取代可以进一步降低T-C，直到在Fe1.33Ni1.32GeTe2中几乎没有磁有序为止。磁性有序性的抑制是由于空位或非磁性镍原子对磁性铁原子的随机稀释而引起的。

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