L. Kępiński, M. Zawadzki, W. Mista
Dec 1, 2004
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Influential Citations
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Quality indicators
Journal
Solid State Sciences
Abstract
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) 0.55 ⋅0.45H 2 O stoichiometry was obtained. Upon heating this phase transformed, via intermediate cubic oxide, into trigonal Nd 2 O 3 at 800 °C. Nd(OH) 3 hydroxide obtained at severe conditions (180 °C) transformed upon heating into cubic Nd 2 O 3 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.