Orthorhombic-orthorhombic phase transitions in Nd2NiO4+δ (0.067≤δ≤0.224)

Kenji Ishikawa, Kenji Metoki, Hiroshi Miyamoto

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Variation of the phases of Nd2NiO4+δ with the excess oxygen concentration δ has been examined at room temperature in the range 0.067≤δ≤0.224 using the X-ray powder diffraction technique. The phases observed at room temperature are orthorhombic-I (0.21<δ≤0.224), orthorhombic-IV (0.175<δ≤0.21), orthorhombic-II (0.15<δ≤0.175), orthorhombic-II+quasi-tetragonal-I (0.10<δ≤0.15), and quasi-tetragonal-I (0.067<δ≤0.10).

Original languageEnglish
Pages (from-to)2096-2103
Number of pages8
JournalJournal of Solid State Chemistry
Issue number8
Publication statusPublished - 1 Aug 2009


  • NdNiO
  • Phase diagram
  • Phase transforms

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