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The nGeTe.mBi,Te, and nGeTe.mSb,Te, homologous series mixed layered (ML) compounds have been investigated by X-ray diffraction. A variety of the ML longperiod structures is discovered in the GeTe-Bi,Te, and GeTe-Sb,Te, quasi-binary systems. Temperature dependencies of Hall coefficient, electrical resistivity and Seebeck coefficient have been measured in a wide temperature range. A mixed carrier scattering mechanism on acoustic phonons and point defects is proposed to explain the carrier mobility temperature dependence at low temperatures. It is found that the ML compounds are characterized by extremely low lattice thermal conductivity at 300 K: Kp,,=5-7 mW/cm K.