Phase transition and temperature dependent electronic state of an organic ferroelectric, phenazine-chloranilic acid (1:1)

T. Asaji, J. Seliger, V. Žagar, M. Sekiguchi, J. Watanabe, K. Gotoh, H. Ishida, S. Vrtnik, J. Dolinšek

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22 Citations (Scopus)

Abstract

The isotope effect of hydrogen motion in an organic ferroelectric, phenazine (Phz)-chloranilic acid (H2ca and D2ca for normal and deuterated compounds, respectively) co-crystal, was studied by 35Cl nuclear quadrupole resonance (NQR). Besides a ferroelectric transition at Tc ≤ 253K (303K), a neutral-to-ionic transition was found below 170K (200K) for Phz-H2ca (Phz-D2ca). 1H-14N nuclear quadrupole double resonance measurements were also made in order to study the temperature dependent electronic state of Phz-(H/D)2ca. 14N NQR parameters suggested that donor orbital populations of the two nitrogen atoms in a phenazine molecule become nonequivalent (1.78 and 1.97) in the ferroelectric phase, while they are both equal to 1.89 in the paraelectric phase. In the ionic phase of Phz-D 2ca, which was obtained by cooling below 188K, they became 1.50 and 1.95, suggesting a proton transfer from D2ca toPhz.

Original languageEnglish
Article number226203
JournalJournal of Physics Condensed Matter
Volume19
Issue number22
DOIs
Publication statusPublished - Jun 6 2007

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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