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Powdered ceramic composites based on the amorphous potassium polytitanate modified in aqueous solutions of cobalt sulfate and calcined at 700℃ (PPT-Co) were used as the ceramic filler of the polytetrafluorethylene–matrix composite dielectrics characterized with high permittivity and low dielectric losses. The influence of the ceramic filler content on the electrical properties of the produced composites was investigated in the range of 1–50 wt%. The obtained results were compared with the data reported in literature for other ferroelectric composites based on polytetrafluorethylene and were analyzed taking into account some theoretical models earlier proposed for the two-component systems. An influence of the temperature on the frequency dependence of permittivity at 30–150℃ for the composites with different filler contents was investigated.

LixLn5–xMo3O16.5–1.5xFx (0.8 ≤ x ≤ 1.4 (Ln = La), 0.4 ≤ x ≤ 1 (Ln = Pr), 0.6 ≤ x ≤ 1 (Ln = Nd)) solid solutions on the Ln5Mo3O16–LiLn4Mo3O15F joins of the Ln2O3–MoO3–LiF ternary systems, similar to the fluorite‐related cubic compound Nd5Mo3O16, have been prepared by solid‐state reactions. Substitutions of lithium on the rare‐earth site and fluorine on the oxygen site have been shown to lead to a reversible phase transition accompanied by an anomaly in permittivity and a jump in conductivity by one and half orders of magnitude. In a wet atmosphere, the LixLn5–xMo3O16.5–1.5xFx compounds may have proton conductivity.