Controlling Stoichiometry in Low Temperature Synthesis of La0.7Sr0.3MnO3 Nanoparticles
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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Document Type: Research Article
Publication date: February 1, 2011
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