The heat capacity, heat expansion, magnetization, paramagnetic sensitivity, Messbauer effect, heat conductivity, electroconductivity and thermo e.d.s. of low-measure semiconductory compounds of A^IIIB^VI, TlMX₂ (M=Ga, In, Fe, Cr; X=S, Se,Te) type and as well as solid solitions of TlGaSe₂-TlInS₂-TlInSe₂ have been investigated for the first time. Reguliarities of changes of heat and magnet properties in lamellar and structures of A^IIIB^VI and TlMX₂  types have been established. For the first time in chain crystals of TlTe, TlGaSe₂, TlGaTe₂ and TlInSe₂ there are discovered phase transitions linked with the presence of incommensurable phase in these crystals. It is shavn that  semiconductory compounds of TlFeS₂ and TlFeSe₂ are quasi one-dimensional magnetics and semiconductory TlFeTe₂ are ferromagnetic with Curie temperature 222,0K. It is established that magnetic head capacity and sensitivity of TlCrSe₂ are typical for quasi two-dimensional magnetic systems.

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