Dielectric properties and lattice dynamics of Ca-doped K$_{0.95}$Li$_{0.05}$TaO$_{3}$

Details Dielectric properties and lattice dynamics of Ca-doped K$_{0.95}$Li$_{0.05}$TaO$_{3}$ Dielectric properties and lattice dynamics of Ca-doped K$_{0.95}$Li$_{0.05}$TaO$_{3}$

2006-08-03

arxiv.org/abs/cond-mat/0608074v1

Phys. Rev. B 74, 054101 (2006)

Physics

Condensed Matter

Materials Science

13 pages, 12 figures

Scientific paper

10.1103/PhysRevB.74.054101

Relaxor behavior and lattice dynamics have been studied for a single crystal of K$_{1-x}$Li$_x$TaO$_3$ $(x=0.05)$, where a small amount of a Ca impurity ($\sim 15$~ppm) was incorporated. The dielectric measurements revealed Debye-like relaxations with Arrhenius activation energies of 80 and 240 meV that are assigned to Li$^+$ dipoles and the Li$^+$-Li$^+$ dipolar pairs, respectively. In the neutron scattering results, diffuse scattering ridges appear around the nuclear Bragg peaks below $\sim 150$ 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. These results are supported by the dielectric data that reveal relaxor behavior starting at $\sim 200$ K on cooling. 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 Pb(Mg$_{1/3}$Nb$_{2/3}$)O$_3$.

Affiliated with

Also associated with

No associations

Rating

Dielectric properties and lattice dynamics of Ca-doped K$_{0.95}$Li$_{0.05}$TaO$_{3}$ does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Dielectric properties and lattice dynamics of Ca-doped K$_{0.95}$Li$_{0.05}$TaO$_{3}$, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dielectric properties and lattice dynamics of Ca-doped K$_{0.95}$Li$_{0.05}$TaO$_{3}$ will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-50131