Structural and Magnetic Ordering in Bulk Sr2FeMoO6 Synthesized by Planetary Ball Mill: The Effects of Grinding

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The Ohio State University

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The standard solid-state synthesis procedure has been widely used to make bulk complex oxides, including the half-metallic double perovskite Sr2FeMoO6. However, although it is generally recognized that multi-step grinding and heating are crucial for synthesis of high quality materials, little has been done to quantitatively characterize the effects of grinding on the qualities of the final products. We systematically varied the level of grinding, ranging from poor grinding by hand for a short period of time to very fine grinding and mixing by a planetary ball mill for many hours which produces uniform sub-micron particles. X-Ray Diffraction, Scanning Electron Microscopy, and Superconducting Quantum Interference Device magnetometry were used to characterize the structural and magnetic properties. The Sr2FeMoO6 samples made by different grinding methods exhibit drastically different structural and magnetic ordering. The highest quality Sr2FeMoO6 is from the most thorough grinding and gives a close to ideal Fe/Mo ordering and magnetic moment close to 4 Bohr magnetron per formula unit.


Department of Engineering Undergraduate Research Scholarship 2010-2011


Sr2FeMoO6, Double Perovskite, Ferromagnet, Half-Metallic, Half-Metal, Half Metal, Half Metallic, Spintronics