OSU Navigation Bar

The Ohio State University University Libraries Knowledge Bank

TEMPERATURE VARIABLE LOW-FREQUENCY RAMAN SPECTRA AND ORIENTATION DISORDER IN $NH_{4}IO_{3}$ CRYSTAL

Please use this identifier to cite or link to this item: http://hdl.handle.net/1811/29951

Show full item record

Files Size Format View
1995-FE-06.jpg 65.69Kb JPEG image Thumbnail of TEMPERATURE VARIABLE LOW-FREQUENCY RAMAN SPECTRA AND ORIENTATION DISORDER IN $NH_{4}IO_{3}$ CRYSTAL

Title: TEMPERATURE VARIABLE LOW-FREQUENCY RAMAN SPECTRA AND ORIENTATION DISORDER IN $NH_{4}IO_{3}$ CRYSTAL
Creators: Barabash, Alexander; Gavrilko, T.; Sekirin, I. V.
Issue Date: 1995
Abstract: The ammonium iodate $NH_{4}IO_{3}$ crystal is $known^{1}$ as ferroelectric with displacing type phase transition $(T_{c} = 367K)$, Polarized temperature variable lowfrequency Raman scattering $(W < 200 cm^{-1})$ studies in the phase transition region are presented. Measurements of peak positions of ``external'' rotational and translation optical modes and their half-widths allow to detect the orientation disorder and help to determine its character as well as a mechanism of the phase transition to the ordered phase. It appeared to be continuous and of the mixed displacing and order-disorder character. Quantitative analysis of the spectra according to lattice dynamics theories and using $^{127}I$ NQR $analysis^{2}$ have been performed. Previous literature data are reviewed and the apparent discrepancies concerning the transition processes are elucidated on the basis of the present results.
URI: http://hdl.handle.net/1811/29951
Other Identifiers: 1995-FE-06
Bookmark and Share