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    In situ variable temperature X-ray diffraction studies on the transformations of nano-precursors to LaNiO phases

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    In situ variable temperature XRD (VT-XRD) measurements on the transformation of nano-precursors to La-Ni-O phases are presented. Experimental results showed that LaNiO3 and La2NiO4 phases were formed at ca. 700 degrees C via the reaction of La2O3 and NiO (from the initial nano-precursors), where a relatively low temperature of 700 degrees C was found for the synthesis of La2NiO4. The formation of La3Ni2O7 at higher temperature (up to 1150 degrees C) appeared to proceed through a further reaction of La2NiO4 with unreacted NiO, whilst the formation of La4Ni3O10 (at 1075 degrees C) proceeded via a further decomposition of LaNiO3. Although phase pure La3Ni2O7 and La4Ni3O10 were not directly obtained under the processing conditions herein, the results of this study allow for a better understanding of formation pathways, particularly for the higher order La-Ni-O phases. (C) 2011 Elsevier Inc. All rights reserved.

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    Description

    Title : In situ variable temperature X-ray diffraction studies on the transformations of nano-precursors to LaNiO phases
    Author(s) : XL Weng, JC Knowles, I Abrahams, ZB Wu, JA Darr
    Abstract : In situ variable temperature XRD (VT-XRD) measurements on the transformation of nano-precursors to La-Ni-O phases are presented. Experimental results showed that LaNiO3 and La2NiO4 phases were formed at ca. 700 degrees C via the reaction of La2O3 and NiO (from the initial nano-precursors), where a relatively low temperature of 700 degrees C was found for the synthesis of La2NiO4. The formation of La3Ni2O7 at higher temperature (up to 1150 degrees C) appeared to proceed through a further reaction of La2NiO4 with unreacted NiO, whilst the formation of La4Ni3O10 (at 1075 degrees C) proceeded via a further decomposition of LaNiO3. Although phase pure La3Ni2O7 and La4Ni3O10 were not directly obtained under the processing conditions herein, the results of this study allow for a better understanding of formation pathways, particularly for the higher order La-Ni-O phases. (C) 2011 Elsevier Inc. All rights reserved.
    Keywords : fuel cells, lanio oxides, perovskites, powders solid state reaction, x ray methods

    Subject : unspecified
    Area : Other
    Language : English
    Year : 2011

    Affiliations UCL
    Journal : Journal of Solid State Chemistry
    Volume : 184
    Issue : 7
    Publisher : ACADEMIC PRESS INC ELSEVIER SCIENCE
    Pages : 1688-1694
    Url : http://discovery.ucl.ac.uk/1314541/

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