The Local Order in KTaO₃Admixtured by the Ions of Li⁺

Abstract

The low temperature behavior of the KTaO 3 type incipient ferroelectric crystals is of constant interest. The quantum fluctuations reduce the transition to the ferroelectric state in these crystals. It is possible that the small amount of the dopant Li + can lead, through the elastic interactions, to local glass-like short-range order or even to the relaxor ferroelectric order for x > 2.6%. We presented that the low lithium doped x = 0.005 KTaO 3 crystals exhibit the dielectric dispersion of ε and ε , suggesting the glass-like behavior in the low temperature range.

Influence of lattice polarizability on interacting Li-induced dipoles distributed in incipient ferroelectricKTaO3

“…15,27 Considering that J Li-Li is hardly influenced by the evolution of the host lattice polarizability, J Li-Li should be a short-range interaction that cannot form a long-range ferroelectric order by itself. Plausible candidates for J Li-Li are an elastic coupling between Li ions [59][60][61] or, perhaps, a coupling assisted by a phonon in the Brillouin zone boundary. 29,62 As for the origin of LF-RP, the most recent results by Yokota et al seem to provide significant information on LF-RP.…”

K0.9982Li0.0018TaO3Crystal Under External DC Electric Field

“…In our last papers [1][2][3] we demonstrated the low-temperature state of KLT-0.18 which may be considered as a quantum superparaelectric one that may be toggled into an improper ferroelectric while applying an electric field [2] or a chiral glass state [3].…”

“…It is possible, that the small amount of dopant (Li + or Nb + ) or intrinsic imperfection of the crystal through elastic interactions can lead to local glass-like short-range order or even ferroelectric long-range order. The low temperature properties of doped crystals result from the dipole moment given by the off-center position of dopant ions [1][2][3][15][16][17][18][19][20][21][22][23][24][25][26][27].…”