Charge ordering in Eu4as3 under pressure

Hisao Kobayashi, Yutaka Kazekami, Yasuo Ohishi, Makoto Shirakawa, Aakira Ochiai

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


The pressure versus temperature phase diagram of the mixed-valence Eu 4As3 compound was determined by means of x-ray diffraction measurements using synchrotron radiation. The structural phase transition occurs at 343 K under ambient pressure with volume reduction and the transition temperature increases linearly with pressure up to about 5 GPa. The entropy change at this transition is estimated to be 41 J mol-1 K -1 from the Clausius-Clapeyron relation. The value is twice larger than the configuration entropy which is expected from a random arrangement of Eu3+ and Eu2+ ions in the thermally driven valence fluctuating state of Eu4As3. Moreover, a new structural phase was observed above 20 GPa at room temperature.

Original languageEnglish
Pages (from-to)S895-S899
JournalJournal of Physics Condensed Matter
Issue number11
Publication statusPublished - 2005 Mar 23

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics


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