Synthesis, structural and magnetic properties of self-organized single-crystalline nanobricks of chalcopyrite CuFeS2.
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| Title: | Synthesis, structural and magnetic properties of self-organized single-crystalline nanobricks of chalcopyrite CuFeS |
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| Authors: | Lyubutin, Igor S.1 lyubutin@ns.crys.ras.ru, Lin, Chun-Rong2 crlin@mail.stut.edu.tw, Starchikov, Sergey S.1, Siao, Yu-Jhan2, Shaikh, Muhammad Omar2, Funtov, Konstantin O.1, Wang, Sheng-Chang2 |
| Source: | Acta Materialia. Jun2013, Vol. 61 Issue 11, p3956-3962. 7p. |
| Subjects: | Chalcopyrite, Magnetic properties of metals, Self-organizing systems, Copper compounds, Crystal structure, Magnetic semiconductors, Nanoparticle synthesis |
| Abstract: | A thermal pyrolysis method has been developed to synthesize the tetragonal phase of chalcopyrite magnetic semiconductor CuFeS2 nanoparticles. All nanoparticles have the same anisotropic brick-like shape, and the “bricks” are self-organized in a certain orientation, creating well-ordered nanocomposites. High-resolution transmission electron microscopy and electron diffraction data show that every nanobrick is a single crystal with a layered atomic structure and characteristic dimensions of about 5nm×20nm in plane. Magnetic measurements support the antiferromagnetic spin structure and reveal the appearance of a small ferromagnetic component below 60K. Magnetic anomalies observed in the zero-field cooled magnetization curves at low temperatures may be related to an appearance of magnetic moment at the Cu ion site. The Mössbauer spectra show that only about 50% of Fe atoms are in the magnetically ordered α-phase of chalcopyrite. The remaining Fe is non-magnetic and may be located either in the γ-phase of chalcopyrite or in isocubanite. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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