Semiconductor Physics, Quantum Electronics & Optoelectronics. 2002. V. 5, N 4. P. 368-372.

PACS: 65.40.Ba

Concentration anomaly of heat capacity in PbTe based solid solutions
E.I. Rogacheva1, N.A. Sinelnik, I.M. Krivulkin

1National Technical University "Kharkov Polytechnic Institute", 21 Frunze str., 61002 Kharkov, Ukraine

Abstract. The temperature dependences of the heat capacity in the Pb1-xMnxTe and Pb1-xGexTe (x = 0-0.04) solid solutions based on PbTe were obtained in the temperature range of 100-670 K. Pronounced peaks were observed in the isotherms of the heat capacity in the vicinity of x ~ 0.01-0.015. The presence of the peaks is explained on the basis of the idea about the existence of concentration phase transitions of percolation type, which take place in any solid solution and are related to transformation of impurity discontinuum into impurity continuum.

Keywords: lead telluride, solid solution, heat capacity, temperature dependence, heat capacity isotherm, concentration phase transition, percolation.
Paper received 04.09.02; accepted for publication 17.12.02.

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