Hydrothermal synthesis of precursors of neodymium oxide nanoparticles

2020-02-14 14:06:18

phase oxide precursors neodymium microscopy

责任者: Kpinski, L.;Zawadzki, M.;Mista, W. 单位: Inst. of Low Temp. & Struct. Res., Polish Acad. of Sci., Wroclaw, Poland 来源出处: Solid State Sciences(Solid State Sci. (France)),2004/12/,6(12):1327-36 摘要: 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)0.55·0.45H2O 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. [All rights reserved Elsevier] 关键词: atomic force microscopy;crystal growth from solution;crystal structure;differential thermal analysis;dip coating;Fourier transform spectra;heat treatment;infrared spectra;nanoparticles;nanotechnology;neodymium compounds;organic compounds;solid-state phase transformations;stoichiometry;surface morphology;thin films;transmission electron microscopy;X-ray diffraction;hydrothermal reaction;Nd(OH)2.45(Ac)0.55·0.45H2O stoichiometry;nanometric precursors;neodymium oxide nanoparticles;fibrous morphology;X-ray diffraction;XRD;transmission electron microscopy;TEM;high resolution transmission electron microscopy;HRTEM;thermogravimetric analysis;differential thermal analysis;DTA;FTIR spectra;atomic force microscopy;AFM;stoichiometry;cubic Nd2O3 phase;fibrous precursors;homogeneous thin coatings;planar substrates;thermal evolution;heating;cubic-trigonal phase transformation;mild conditions;140 degC;180 degC;Nd2O3;Si