Preparation, Structure, and Electrical Conductivity of La(Ga,Mn)O3 Ceramics |
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Authors: | T. V. Polteva N. U. Venskovskii G. M. Kaleva A. V. Mosunov S. G. Prutchenko E. D. Politova |
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Affiliation: | (1) Russian University of Peoples' Friendship, ul. Miklukho-Maklaya 6, Moscow, 117198, Russia;(2) Karpov Research Institute of Physical Chemistry (, Russian State Scientific Center, ul. Vorontsovo pole 10, Moscow, 105064, Russia |
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Abstract: | (La0.90.1)(Ga1 – xMnx)Oy ( = vacancy;x = 0, 0.2, 0.4, 0.6, 0.8, 1.0) perovskite solid solutions are prepared by solid-state reactions and characterized by x-ray diffraction, electron microscopy, and dielectric spectroscopy. The solid solutions have a rhombohedral structure over the entire composition range. Mn substitution leads to a transition from ionic hopping conduction, with a linear variation of log (T) with 1/T, to ionic–electronic conduction. The unit-cell volume and conductivity of the solid solutions are shown to correlate with their tolerance factor. |
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