R. Zie, D. Bi-nska, K. Rytz, M. Szot, and K. Roleder, Birefringence above Tc in single crystals of barium titanate, J. Phys. Condens. Matter, vol.20, pp.1-5, 2008.

-. Ko, T. H. Kim, K. Roleder, D. Rytz, and S. Kojima, Precursor dynamics in the ferroelectric phase transition of barium titanate single crystals studied by Brillouin light scattering, Physical Review B, vol.9, issue.9, pp.1-6, 2011.
DOI : 10.1103/PhysRevLett.98.265701

H. Bussmann-holder, G. Beige, and . Volkel, Precursor effects, broken local symmetry, and coexistence of order-disorder and displacive dynamics in perovskite ferroelectrics, Physical Review B, vol.9, issue.18, pp.1-6, 2009.
DOI : 10.1103/PhysRevB.70.184303

A. Bokov and Z. Ye, Recent progress in relaxor ferroelectrics with perovskite structure, Journal of Materials Science, vol.45, issue.156, p.31, 2006.
DOI : 10.1080/00150199508228315

L. Mulvihill, L. E. Cross, W. Cao, and K. Uchino, Domain-Related Phase Transitionlike Behavior in Lead Zinc Niobate Relaxor Ferroelectric Single Crystals, Journal of the American Ceramic Society, vol.41, issue.7, pp.1462-1468, 1997.
DOI : 10.1103/PhysRevB.41.11319

M. Lebon, R. Marssi, H. Farhi, G. Dammak, and . Calvarin, Translational and orientational order in lead zinc niobate: An optical and Raman study, Journal of Applied Physics, vol.32, issue.7, pp.3947-3954, 2001.
DOI : 10.1088/0953-8984/9/47/020

. Sitko, PbMg 1/3 Nb 2/3 O 3 -doping effects on structural, thermal, Raman, dielectric and ferroelectric properties of BaTiO 3 ceramics, J. Eur. Ceram. Soc, vol.35, pp.1777-1783, 2015.

M. E. Farhi, A. Marssi, J. Simon, and . Ravez, A Raman and dielectric study of ferroelectric ceramics, The European Physical Journal B, vol.9, issue.4, pp.99-604, 1999.
DOI : 10.1007/s100510050803

E. Janolin, B. Dkhil, P. Bouvier, J. Kreisel, and P. A. Thomas, Pressure instabilities up to 46 GPa in the relaxor ferroelectric PbZn 1/3 Nb 2/3 O 3, Phys. Rev. B, vol.73, pp.1-9, 2006.
URL : https://hal.archives-ouvertes.fr/hal-00133258

A. M. Kreisel, G. O. Glazer, P. A. Jones, P. A. Thomas, G. Abello et al., 1) solid solution, Journal of Physics: Condensed Matter, vol.12, issue.14, pp.3267-3280, 2000.
DOI : 10.1088/0953-8984/12/14/305

URL : https://hal.archives-ouvertes.fr/hal-00417955

V. V. Zalar, R. Laguta, and . Blinc, NMR Evidence for the Coexistence of Order-Disorder and Displacive Components in Barium Titanate, Physical Review Letters, vol.13, issue.264, p.37601, 2003.
DOI : 10.1088/0953-8984/13/11/103

R. E. Cohen, Origin of ferroelectricity in perovskite oxides, Nature, vol.358, issue.6382, pp.136-140, 1992.
DOI : 10.1038/358136a0