Abstract
The temperature dependence of the static electrical conductivity σdc(T) of a single crystal of lanthanum gallium silicate (langasite) La3Ga5SiO14 activated with an impurity of Mn (1000 ppm) has been studied by impedance spectroscopy. Impedance measurements of La3Ga5SiO14 (sp. gr. P321, Z = 1) were carried out along crystallographic axes a (double symmetry axis) and c (triple symmetry axis). It was found that the values of σ||a are significantly higher than the electrical conductivity σ||с, the anisotropy of the electrical conductivity is σ||a/σ||c = 170 at 773 K. The activation energy of electrotransport is Eσ = 0.75 ± 0.05 and 1.09 ± 0.02 eV along the a and c axes, respectively. The electrical conductivity mechanism has an ionic nature and an impurity character; oxygen vacancies VO•• are the most probable current carriers.
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