Dielectric Response of KTaO3 Single Crystals Weakly Co-Doped with Li and Mn
authors Tkach, A; Zlotnik, S; Vilarinho, PM
nationality International
journal CRYSTALS
author keywords perovskites; polar dielectrics; co-doping; dielectric relaxation
keywords RELAXATION; GROWTH; GLASS
abstract Alkali tantalates are encouraging functional materials with versatile properties that make them potential players in microelectronics, photocatalytic processes or medicine. Here, KTaO3 single crystals with 0.27% Li and 0.15% or 0.31% Mn contents determined by inductively coupled plasma spectroscopy analysis are studied at low temperatures using dielectric spectroscopy in a frequency range of 10(2)-10(6) Hz. Both Li and Mn doping are found to induce separate low-frequency dielectric relaxations of comparable strength in KTaO3. The relaxation dynamics follow the Arrhenius law with activation energy values of ~77 and 107 meV, attributing the relaxation origin to the dipoles formed by off-centre Li-K(+) and Mn-K(2+) ions, respectively.

publisher MDPI
isbn 2073-4352
year published 2021
volume 11
issue 10
digital object identifier (doi) 10.3390/cryst11101222
web of science category 8
subject category Crystallography; Materials Science, Multidisciplinary
unique article identifier WOS:000711867300001
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journal impact factor 2.404
5 year journal impact factor 2.376
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