Hydrothermal synthesis of precursors of neodymium oxide nanoparticles |
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Authors: | Leszek Kpiski Mirosaw Zawadzki Wodzimierz Mita |
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Institution: | Institute of Low Temperature and Structure Research, Polish Academy of Sciences, PO Box 1410 Wrocław 2, Poland |
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Abstract: | The nanometric precursors of neodymium oxide of various morphologies were prepared via a hydrothermal reaction route. The precursors and their thermal evolution to neodymium oxide phase were characterised by means of X-ray diffraction (XRD), transmission electron microscopy (TEM, HRTEM), thermal analysis (TG, DTA, EGA-MS), FTIR and atomic force microscopy (AFM). It was found that the reaction conditions (temperature, pressure) played a key role for the product formation of desired morphology and structure. At mild conditions (140 °C) precursor with unusual fibrous morphology and Nd(OH)2.45(Ac)0.550.45H2O stoichiometry was obtained. Upon heating this phase transformed, via intermediate cubic oxide, into trigonal Nd2O3 at 800 °C. Nd(OH)3 hydroxide obtained at severe conditions (180 °C) transformed upon heating into cubic Nd2O3 phase at about 500 °C and this phase was stabilised even at 800 °C. The fibrous precursors appeared to be a convenient material for preparation of homogeneous thin coatings on planar substrates is shown. |
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Keywords: | Nanoparticles Neodymium oxide Hydrothermal synthesis Neodymium hydroxide acetate |
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