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Bulgarian Journal of Physics
Print: 1310-0157 Online: 1314-2666
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RECOGNIZED BY THE EUROPEAN PHYSICAL SOCIETY 
Bulg. J. Phys. vol.26 no.1-2 (1999), pp. 082-086
Electric Conductivity and Dielectric Properties of Polycrystalline Solid Solutions MgTiO3–CaTiO3
M.M. Nadoliisky1, V.D. Parvanova2, M.P. Maneva2
1Department of Physics, University of Architecture, Civil Engineering and Geodesy, 1421 Sofia, Bulgaria
2Department of Inorganic Chemistry, University of Chemical Technology and Metallurgy, 8 Kliment Ohridski Street, 1756 Sofia, Bulgaria
go back1Department of Physics, University of Architecture, Civil Engineering and Geodesy, 1421 Sofia, Bulgaria
2Department of Inorganic Chemistry, University of Chemical Technology and Metallurgy, 8 Kliment Ohridski Street, 1756 Sofia, Bulgaria
Abstract. The temperature dependence of dielectric constant εr, the loss factor D, the alternating-current conductivity σ∼ and the direct-current conductivity σ- of four compositions of the polycrystalline system MgxTiO3–Cai-xTiO3 was investigated in the 293–473 K temperature range. The materials exhibit good temperature stability of εr and low dielectric losses (tanδ ≈ 10-4–10-2 at room temperature) due to the determining role of the electronic and ionic polarization. The activation energies of the materials have been determined and they show the impurity character of the de conductivity. The X-ray-phase analysis has shown the presence of three additional phases in the materials determined as MgTi2O5, MgO and TiO2.