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Li
TaO
Wakimoto, Shuichi; Samara, G. A.*; Grubbs, R. K.*; Venturini, E. L.*; Boatner, L. A.*
Nuclear Instruments and Methods in Physics Research A, 600(1), p.254 - 256, 2009/02
Times Cited Count：3 Percentile：28.22(Instruments & Instrumentation)Neutron scattering experiments have been performed on relaxor ferroelectric KLiTaO with 
=0.05 and 0.10, where the former shows only relaxor behavior down to the lowest temperature, and the latter shows ferroelectric phase transition in addition to the relaxor behavior at higher temperatures. Studies of ferroelectric (FE) soft mode and diffuse scattering from the polarized nano-regions revealed that the FE soft mode behaves as similar as that in conventional displacive ferroelectrics. Also, it is found that the displacements of atoms in the polarized nano-regions contains a component which results from a condensation of the ferroelectric mode and a uniform displacements of all atoms. These facts suggest that the zone-center ferroelectric mode has an important contribution to the ferroelectric behavior in this system in addition to the Li atoms dipole relaxation.
Li
TaOWakimoto, Shuichi; Samara, G. A.*; Grubbs, R. K.*; Venturini, E. L.*; Boatner, L. A.*; Xu, G. Y.*; Shirane, Gen*; Lee, S.-H.*
Physical Review B, 74(5), p.054101_1 - 054101_12, 2006/08
Times Cited Count：25 Percentile：70.4(Materials Science, Multidisciplinary)Relaxor behavior and lattice dynamics have been studied for a single crystal of KLi
TaO
, where a small amount of a Ca impurity (
ppm) is incorporated. The dielectric measurements revealed Debye-like relaxations of Li
dipoles and the Li-Li dipolar pairs below 200K. In the neutron scattering, diffuse scattering appears around the nuclear Bragg peaks below 
K and phonon line broadening features start to appear at even higher temperatures suggesting that polar nano-regions (PNR's) start to form at these temperatures accomapied with the relaxational behavior of Li ions. From analyses of the diffuse intensities, the displacements include a uniform phase shift of all of the atoms in addition to the atomic displacements corresponding to a polarization vector of the transverse optic soft ferroelectric mode, a finding that is analogous to that in the prototypical relaxor material PMN.
Suzuya, Kentaro; Loong, C.-K.*; Price, D. L.*; Sales, B. C.*; Boatner, L. A.*
Journal of Non-Crystalline Solids, 258(1-3), p.48 - 56, 1999/00
Times Cited Count：16 Percentile：70.41(Materials Science, Ceramics)no abstracts in English
Wakimoto, Shuichi; Samara, G. A.*; Grubbs, R. K.*; Venturini, E. L.*; Boatner, L. A.*; Xu, G. Y.*; Shirane, Gen*; Lee, S.-H.*
no journal, ,
Neutron scattering has been performed on relaxor KLiTaO (KLT) 
single crystals to study phonon and duffuse scattering. Dielectric measurements show that the 
sample has only relaxor state down the base temperature while the 
sample has a clear ferroelectric transition at 
K below which the system still shows relaxation of Li ions. Neutron scattering results demonstrate that the transiverse optic ferrolectric mode softens gradually with decreasing temperature for the former sample. On the other hand, the latter sample exhibits small hardening of the TO mode at Tc and then softens below Tc. These facts imply that the TO mode plays an important role in addition to the Li relaxation.
