A Central Peak in the Order-Disorder Phase Transition of Sodium Nitrate

Hiroshi Yasaka, Akira Sakai, Toshirou Yagi

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)


A central peak in the low-frequency Raman spectra of sodium nitrate has been observed in a temperature range from room temperature to above the phase transition point (Tc). The central peak in the x(zz)y geometry is strongly dependent on temperature. Its intensity and width show an anomaly in temperature dependence near Tc. The anomalous part of the intensity is well expressed by a function of temperature (Tc — T)1/2 with a critical index of the order parameter. The origin of the central peak is assigned to an intrinsic one, that is, a motion of NO3- ions which becomes active with increasing temperature.

Original languageEnglish
Pages (from-to)3697-3700
Number of pages4
Journaljournal of the physical society of japan
Issue number10
Publication statusPublished - 1985 Jan 1
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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