Abstract
The investigation of the transport properties of the Pb 1− x M 2+ n x F 2+ nx ( n = 1,2) solid solutions shows a maximum of the activation energy Δ E max associated to a minimum of the conductivity for a very small value of x : x min. ( x min. ≅ 0.01 for n = 1; x ,in ≅ 0.005 for n = 2). The value of Δ E max. depends closely on the nature of the substituting cation. Correlations have been established between the transport properties and the nature of the point defects which are supposed to occur in the considered composition range ( nn or innn pairs) by analogy with similar alkali-earth fluorides. The size difference Δ r between host and substitutional cations seems to play an essential role. The evolution of Δ E max. and the preferential stability of the nn or nnn pairs is discussed as a function of Δ r.
Published Version
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