Published in the scientific journal with IF(2009)=5.368 Magnetic ordering in Mn-doped KTaO3 was investigated as a function of Mn-content and processing route. Although we have detected the antiferromagnetic ordering at low temperature (42K) we showed that its origin is not in intrinsic long-range nor spin-glass ordering of Mn spins in the KTaO3 host lattice as often claimed in literature. We present evidences that the ordering is of an extrinsic nature and originates from traces of residual Mn3O4 not incorporated into the KTaO3 matrix.
COBISS.SI-ID: 1422075
Polar fluctuations were found in KTaO3 when K+ was substituted with Mn2+ on the A-site. The temperature dependence of the real part of the dielectric permittivity of (K1-2xMnx?x)TaO3 ceramics (x = 0-0.05) shows a diffuse maximum between 50-100 K in the frequency range 100Hz-1MHz. The observed relaxor-type dielectric behavior is attributed to the formation of electric dipoles originating from two distinct sources; one from an atomic off-center position when Mn2+ substitutes for K+ and one from the anion deficiencies formed by these aliovalent substitutions.
COBISS.SI-ID: 1751291