X-ray diffraction study on formation of ErNbO 4 powder

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Original languageEnglish
Pages (from-to)315-320
Journal / PublicationJournal of Alloys and Compounds
Issue number1-2
Publication statusPublished - 12 May 2004


The formation of ErNbO4 powder, prepared by calcining an Er 2O3 (50mol%) and Nb2O5 (50mol%) powder mixture at 1100 and 1600°C for different durations, was investigated by using X-ray diffraction. The experimental results have displayed that although the solid-state reaction had started to some extent when the mixture was pre-calcined at 1100°C for a duration of 13h, the two original phases Er2O3 and Nb2O5 still dominated the mixture. When the duration of the calcination reaction was increased to 120h at the same temperature, the resultant mixture experienced a nearly complete phase transformation. Accordingly, the ErNbO4 phase was dominant phase in the mixture. Nevertheless, a small portion of the raw powder still existed in the mixture. When the calcining temperature was elevated to 1600°C, ErNbO4 powder with higher purity could be obtained for a relatively much shorter duration (only up to several tens of hours). A simple formation mechanism of ErNbO4, an elevated-temperature-assisted solid-state chemical reaction: Er2O3+Nb2O 5⇌2ErNbO4, is suggested. In addition, the present experimental results offer important evidence for the formation of the additional phase ErNbO4 induced in Er:LiNbO3 crystals by vapour transport equilibration (VTE) treatment. © 2003 Elsevier B.V. All rights reserved.

Research Area(s)

  • ErNbO 4 powder, Optical material, Solid-state reaction, X-ray diffraction spectroscopy