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

B. Moulin; L. Hennet; D. Thiaudière; P. Melin; P. Simon

doi:doi:10.1051/jp4:2005126021

Issue		J. Phys. IV France Volume 126, June 2005


Page(s)		101 - 105
DOI		https://doi.org/10.1051/jp4:2005126021

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. Moulin^{1, 0}, L. Hennet¹, D. Thiaudière^{1, 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

Abstract
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.

Raman spectroscopy and X-ray diffraction of lithium niobate at temperatures up to 1300 C

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