New conducting phase in the Li2O-ZnO-Nb2O5 system: Existence conditionsстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:The conducting phase Li6ZnNb4O14 in the Li2O-ZnO-Nb2O5 system has been obtained by solid-phase synthesis from Li3NbO4, Li1 - x NbO3, and LiZnNbO4. The new phase exists in the temperature range of (904 +/- 5)-(1145 +/- 5)A degrees C. Quenching the synthesis product from 960A degrees C yields this phase in a metastable state at room temperature. The Li6ZnNb4O14 phase has been characterized by thermal analysis, chemical analysis, and X-ray powder diffraction. The ohmic resistance of ceramic Li6ZnNb4O14 has been determined by complex impedance measurements. The activation energy of conduction, derived from the temperature dependence of conductivity, is E (a) = 0.273 +/- 0.001 eV. The conductivity of the phase at 300A degrees C is 1.2 x 10(-2) S cm(-1).