Electric-field influence on the neutron diffuse scattering near the ferroelectric transition of Sr.sub.0.61./sub.Ba.sub.0.39./sub.Nb.sub.2./sub.O.sub.6./sub.

0463188 - FZÚ 2017 RIV GB eng J - Journal Article
Ondrejkovič, Petr - Kempa, Martin - Savinov, Maxim - Bednyakov, Petr - Kulda, J. - Bourges, P. - Dec, J. - Hlinka, Jiří
Electric-field influence on the neutron diffuse scattering near the ferroelectric transition of Sr_0.61Ba_0.39Nb₂O₆.
Phase Transitions. Roč. 89, 7-8 (2016), s. 808-815. ISSN 0141-1594. E-ISSN 1029-0338
R&D Projects: GA ČR GA16-09142S
Institutional support: RVO:68378271
Keywords : relaxor ferroelectrics * lead-free * strontium barium niobate * neutron scattering * dielectric spectroscopy
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 1.060, year: 2016

Uniaxial relaxor ferroelectric Sr0.61Ba0.39Nb2O6 single crystal has been investigated in the vicinity of its phase transition using neutron scattering and dielectric spectroscopy. A global-type thermal hysteresis is evidenced by both techniques in the ferroelectric phase and up to about 15 K above Tc. In addition, a part of the transverse neutron diffuse scattering in the 001 Brillouin zone, presumably related to static nanodomain structure, can be suppressed by prior poling the crystal in electric field of 3 kV/cm. The remaining part of the transverse neutron diffuse scattering and the real part of permittivity show a similar temperature dependence. The temperature position of the maximal scattering intensity Tmax depends significantly on the scattering wave vector. Tmax shifts monotonically to higher temperature with the increasing wave vector in all investigated cooling and heating regimes.
Permanent Link: http://hdl.handle.net/11104/0262474