Ordering process in sodium nitrite observed by using neutron diffractometry

Hiroyuki Mashiyama, Tatsuki Miyoshi, Takanao Asahi, Hironobu Kasano, Yukio Noda, Hiroyuki Kimura

Research output: Contribution to journalArticlepeer-review


From neutron diffraction data, the nuclear density of sodium nitrite is estimated directly by using a maximum entropy method and is compared with the results of usual least-squares calculations. The obtained nuclear density shows that the disordered NO2 molecule becomes partially ordered in the ferroelectric phase at temperatures just below the transition temperature. However, the density distribution cannot be explained by using a two-Gaussian function, which suggests that the ordering is not a classical stochastic process but a quantum tunneling in a double minima local potential.

Original languageEnglish
Pages (from-to)2515-2518
Number of pages4
JournalJournal of the Korean Physical Society
Issue number31
Publication statusPublished - 2011 Sep 15


  • Ferroelectrics
  • Neutron diffractometry
  • Order-disorder transition
  • Sodium nitrite

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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