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Controlling Stoichiometry in Low Temperature Synthesis of La0.7Sr0.3MnO3 Nanoparticles

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Nanoparticles of complex oxides (<20 nm) are desirable for several applications in view of the diverse range of physical properties of such oxides. However the simultaneous presence of multiple cation precursors makes the corresponding chemical synthesis non-trivial with possible intermediate evolution of secondary phases. Such phases could react at high temperatures to form the desired stoichiometry, but this process is diffusion limited and can lead to larger particles. In this work we examine the role of three different reaction and growth controlling additives, namely dextran, citric acid and hexamine, on the synthesis of the well known colossal magnetoresistive (CMR) manganite La0.7 Sr0.3MnO3. We demonstrate that phase evolutions differ significantly in the three cases, and the physical properties of the products also differ dramatically. Only dextran is shown to yield the desired phase with faceted nanoparticles at as low a temperature as 600 °C. A high saturation moment of ∼47 emu/gm is realized at 10 K with a good square hysteresis loop. In 650 °C annealed sample, room temperature magnetization of ∼15 emu/gm was obtained, which brings the nanoparticles in the applicability domain.
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Keywords: CITRIC ACID; COMPLEX OXIDE; DEXTRAN; HEXAMINE; HYDROTHERMAL

Document Type: Research Article

Publication date: February 1, 2011

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  • ADVANCED SCIENCE LETTERS is an international peer-reviewed journal with a very wide-ranging coverage, consolidates research activities in all areas of (1) Physical Sciences, (2) Biological Sciences, (3) Mathematical Sciences, (4) Engineering, (5) Computer and Information Sciences, and (6) Geosciences to publish original short communications, full research papers and timely brief (mini) reviews with authors photo and biography encompassing the basic and applied research and current developments in educational aspects of these scientific areas.
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