V Vikhnin et al 1995 J. Phys.: Condens. Matter 7 7227 doi:10.1088/0953-8984/7/36/012
V Vikhnin, P Voigt and S Kapphan
Show affiliationsTime-dependent second-harmonic generation experiments in K1-xLixTaO3 crystals for the first time yield a Li concentration dependence of the activation energy of the Arrhenius-like reorientation process of the Li+ ions. The experimental data support the assumption of a Li+ off-centre ion tunnelling via excited and ground vibrational states. With increasing Li concentration, the tunnelling reorientation is suppressed in favour of a thermally activated over-barrier hopping. The suppression of the tunnelling reorientation can be explained by a model of cooperative tunnelling in a percolation dipole cluster and destruction of the tunnelling resonance condition by internal electric dipole fields.
77.84.Dy Niobates, titanates, tantalates, PZT ceramics, etc.
Issue 36 (4 September 1995)
V Vikhnin et al 1995 J. Phys.: Condens. Matter 7 7227
Massimo Brignone and Michele Piana 2005 Inverse Problems 21 207
Marijn Davidse et al JHEP09(2005)065
Amitabh Joshi and A-S F Obada 1997 J. Phys. A: Math. Gen. 30 81
Ryan Turner et al 2003 J. Micromech. Microeng. 13 367
Alejandro Satz 2007 Class. Quantum Grav. 24 1719
A Kivimäki et al 2003 J. Phys. B: At. Mol. Opt. Phys. 36 781
R Willink 2006 Metrologia 43 L39
A A Hamza et al 2004 Meas. Sci. Technol. 15 831
A. de Souza Dutra et al 2003 Europhys. Lett. 62 8