Abstract
The electron paramagnetic resonance of ${\mathrm{Mn}}^{2+}$ in KTa${\mathrm{O}}_{3}$ was measured over a temperature range 4-110 K. At 77 K, the spin-Hamiltonian constants are ${g}_{\ensuremath{\parallel}}=2.000\ifmmode\pm\else\textpm\fi{}0.001$, ${g}_{\ensuremath{\perp}}=2.000\ifmmode\pm\else\textpm\fi{}0.001$, $D=+0.147\ifmmode\pm\else\textpm\fi{}0.003$ ${\mathrm{cm}}^{\ensuremath{-}1}$, ${A}_{\ensuremath{\parallel}}=\ensuremath{-}(86.5\ifmmode\pm\else\textpm\fi{}0.5)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$ ${\mathrm{cm}}^{\ensuremath{-}1}$, ${A}_{\ensuremath{\perp}}=\ensuremath{-}(84\ifmmode\pm\else\textpm\fi{}1.5)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$ ${\mathrm{cm}}^{\ensuremath{-}1}$. The results indicate that the ${\mathrm{Mn}}^{2+}$ is substitutional at a ${\mathrm{Ta}}^{5+}$ site with an adjacent oxygen vacancy. The temperature dependence of $D$ is correlated with the soft-mode frequency of the host. The quadrupole splitting ${Q}^{\ensuremath{'}}=+(0.8\ifmmode\pm\else\textpm\fi{}0.1)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$ ${\mathrm{cm}}^{\ensuremath{-}1}$ was determined from the forbidden hyperfine transitions.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call