Abstract
The behavior of the thermodynamic functions of the silver-intercalated isostructural misfit compounds AgxPbTi2S5 and AgxGdTi2S5 is studied. The region of instability of the homogeneous state, which is typical of materials with less than half-filled polaron band, is revealed in the phase diagram of AgxPbTi2S5. It is shown that the substitution of GdS for PbS gives rise to charge transfer to the TiS2 sublattice, which fills the polaron band above the critical level and suppresses this instability. The behavior of the entropy of silver in both materials fits well the proposed polaron band filling model. It is demonstrated that the peak of the entropy near the boundary of stability of the homogeneous state is universal in character for materials with polaron-type carriers and that it can be associated with a strong variation in the density of states at the Fermi level upon polaron band filling.
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