Funct. Mater. 2021; 28 (4): 662-668

doi:https://doi.org/10.15407/fm28.04.662

Specific heat of Bi2(Te1-xSex)3 solid solutions

K.V.Martynova, E.I.Rogacheva, G.V.Lisachuk

National Technical University "Kharkiv Polytechnic Institute", 2 Kyrpychova Str., 61002 Kharkiv, Ukraine

Abstract: 

The temperature dependences of the specific heat Cp in the temperature range T = 175-500 K were obtained for Bi2(Te1-xSex)3 solid solutions (е = 0-0.06). The peaks of specific heat are revealed on the isotherms of Cp, the presence of which is attributed to the realization of the percolation-type phase transition from dilute solid solutions to concentrated ones. The obtained value of the critical index for the composition dependences Cp(е) (α = 0.105) corresponds to the values of α for specific heat in case of the second-order phase transitions. The results of this work confirm the previously suggested assumption that the concentration anomalies of electrophysical properties observed in the study of Bi2(Te1-xSex)3 solid solutions can be interpreted as the manifestation of the critical phenomena accompanying the percolation-type phase transition from dilute to concentrated solid solutions.

Keywords: 
solid solution, specific heat, composition, temperature, percolation, critical phenomena, critical index.

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