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Synthesis, structural and electronic properties of monodispersed self-organized single crystalline nanobricks of isocubanite CuFe2S3.

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Title: Synthesis, structural and electronic properties of monodispersed self-organized single crystalline nanobricks of isocubanite CuFe2S3.
Authors: Lyubutin, Igor S.1 lyubutinig@mail.ru, Lin, Chun-Rong2 crlinspin@gmail.com, Starchikov, Sergey S.1, Siao, Yu-Jhan3, Tseng, Yaw-Teng2
Source: Journal of Solid State Chemistry. Jan2015, Vol. 221, p184-190. 7p.
Subjects: Self-organizing systems, Copper compounds synthesis, Crystal structure, Electric properties of metals, Nanocomposite materials, Antiferromagnetic materials
Abstract: The nanoparticles with a pure cubic phase of isocubanite CuFe 2 S 3 are successfully synthesized for the first time. The particles are self-organized into the single crystalline nanocomposites with a shape of “bricks” which are well ordered in a certain anisotropic orientation. All bricks have nearly the same shape and dimensions and may be considered as monodispersed nanobricks. Magnetic measurements show paramagnetic behavior of the compound down to 4.2 K with the antiferromagnetic correlation between iron ions. An average magnetic moment is about 2.8–3.0 μ B per formula unit CuFe 2 S 3 . Mössbauer spectroscopy data reveal that the ferric ions in isocubanite are in the high-spin state (spin S =5/2) whereas the ferrous ions are in the intermediate-spin state ( S =1). The Fe 3+ and Fe 2+ ions are distributed randomly over tetrahedral sites and the electron exchange between these ions is absent. This can explain nonmagnetic behavior of isocubanite. In the suggested method, the combined nanocomposites containing the magnetic chalcopyrite CuFeS 2 and the nonmagnetic isocubanite CuFe 2 S 3 can be synthesized in a certain sequence. Such composites could be useful for the applied nanotechnology. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:The nanoparticles with a pure cubic phase of isocubanite CuFe 2 S 3 are successfully synthesized for the first time. The particles are self-organized into the single crystalline nanocomposites with a shape of “bricks” which are well ordered in a certain anisotropic orientation. All bricks have nearly the same shape and dimensions and may be considered as monodispersed nanobricks. Magnetic measurements show paramagnetic behavior of the compound down to 4.2 K with the antiferromagnetic correlation between iron ions. An average magnetic moment is about 2.8–3.0 μ B per formula unit CuFe 2 S 3 . Mössbauer spectroscopy data reveal that the ferric ions in isocubanite are in the high-spin state (spin S =5/2) whereas the ferrous ions are in the intermediate-spin state ( S =1). The Fe 3+ and Fe 2+ ions are distributed randomly over tetrahedral sites and the electron exchange between these ions is absent. This can explain nonmagnetic behavior of isocubanite. In the suggested method, the combined nanocomposites containing the magnetic chalcopyrite CuFeS 2 and the nonmagnetic isocubanite CuFe 2 S 3 can be synthesized in a certain sequence. Such composites could be useful for the applied nanotechnology. [ABSTRACT FROM AUTHOR]
ISSN:00224596
DOI:10.1016/j.jssc.2014.10.006