J. Phys. IV France 126 (2005) 101-105
Raman spectroscopy and X-ray diffraction of lithium niobate at temperatures up to 1300 CB. Moulin1, 0, L. Hennet1, D. Thiaudière1, 2, P. Melin1 and P. Simon1
1 CRMHT-CNRS, 45071 Orléans Cedex 2, France
2 LURE, Centre Universitaire Paris-Sud, Bât. 209D, BP. 34, 91898 Orsay Cedex and Synchrotron Soleil, l'Orme des Merisiers, Saint-Aubin, BP. 48, 91192 Gif-sur-Yvette Cedex, France
Lithium niobate has been studied above its melting point by X-ray diffraction and Raman micro-spectroscopy. For two compositions (congruent and 54 mol% Li2O), a strange phenomenon occurs, starting approximately 10C above melting: solid clusters (30 m) appear in the liquid, remaining up to higher temperatures. These clusters are identified as ferroelectric lithium niobate by means of Raman and X-ray investigations.
© EDP Sciences 2005