Analysis of structural phase transition behavior of Ln2NiO 4 + δ (Ln: Nd, Pr) with variation of oxygen content

Eiki Niwa, Kazuya Wakai, Tetsuya Hori, Takashi Nakamura, Keiji Yashiro, Junichiro Mizusaki, Takuya Hashimoto

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

The orthorhombic-tetragonal structural phase transition behaviors of Pr2NiO4 + δ and Nd2NiO 4 + δ were investigated by DSC and TG-DTA under controlled oxygen partial pressure, P(O2), and their difference was discussed. A discrete weight variation originating from the variation of oxide ion content, Δδ, was observed during the phase transition in both Pr 2NiO4 + δ and Nd2NiO 4 + δ. The Δδ of Pr2NiO 4 + δ was larger than that of Nd2NiO 4 + δ, and the Δδ of Pr2NiO 4 + δ increased with decreasing P(O2), while that of Nd2NiO4 + δ was independent on P(O2), suggesting that not only the valence of Ni but also that of Pr changed during the phase transition in Pr2NiO4 + δ.

Original languageEnglish
Pages (from-to)724-727
Number of pages4
JournalSolid State Ionics
Volume262
DOIs
Publication statusPublished - Sep 1 2014
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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