J. Phys. IV France
Volume 126, June 2005
Page(s) 101 - 105

J. Phys. IV France 126 (2005) 101-105

DOI: 10.1051/jp4:2005126021

Raman spectroscopy and X-ray diffraction of lithium niobate at temperatures up to 1300 $^{\circ\kern-4.80pt\circ}$C

B. 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 10$^{\circ}$C above melting: solid clusters (30 $\mu $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