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Relaxor behavior and lattice dynamics have been studied for a single crystalof 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 revealedDebye-like relaxations with Arrhenius activation energies of 80 and 240 meVthat are assigned to Li$^+$ dipoles and the Li$^+$-Li$^+$ dipolar pairs,respectively. In the neutron scattering results, diffuse scattering ridgesappear around the nuclear Bragg peaks below $\sim 150$ K and phonon linebroadening features start to appear at even higher temperatures suggesting thatpolar nano-regions (PNR's) start to form at these temperatures. These resultsare supported by the dielectric data that reveal relaxor behavior starting at$\sim 200$ K on cooling. From analyses of the diffuse intensities, thedisplacements include a uniform phase shift of all of the atoms in addition tothe atomic displacements corresponding to a polarization vector of thetransverse optic soft ferroelectric mode, a finding that is analogous to thatin the prototypical relaxor material Pb(Mg$_{1/3}$Nb$_{2/3}$)O$_3$.Comment: 13 pages, 12 figure

physical review. b, condensed matter and materials physics

Dielectric properties and lattice dynamics of Ca-doped<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi mathvariant="normal">K</mml:mi><mml:mn mathvariant="bold">0.95</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">Li</mml:mi><mml:mn mathvariant="bold">0.05</mml:mn></mml:msub><mml:mi mathvariant="normal">Ta</mml:mi><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn mathvariant="bold">3</mml:mn></mml:msub></mml:mrow></mml:math>

Dielectric properties and lattice dynamics of Ca-dopedK0.95Li0.05TaO3