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<p>The specific heat capacity of copper-doped alloy SSu3 was determined in the "cooling" mode using the known heat capacity of a reference sample of grade C00 lead. Polynomials describing the cooling rates of the SSu3 alloy samples with copper and the reference sample were obtained by processing their cooling rate curves. Further, using the experimentally determined cooling rate values for the reference sample and the alloy samples and knowing their masses, polynomials were established for the temperature dependence of the heat capacity of the alloys and the reference sample, which are described by a four-term equation. Using integrals of specific heat capacity, mathematical models were established for the temperature dependence of changes in enthalpy, entropy, and Gibbs energy. The obtained dependences showed that with increasing temperature and copper concentration, the heat capacity, enthalpy, and entropy of the SSu3 alloy increase, while the Gibbs energy values decrease.</p>

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Temperature Dependence of Heat Capacity and Changes in Thermodynamic Functions of Copper-Doped Lead–Antimony Alloy SSu3

  • 期刊论文

  • 发表日期：

    2026年6月29日

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  • S. U. Khudoyberdizoda,
  • I. N. Ganiev,
  • J. H. Djailoev,
  • M. N. Mulloeva,
  • M. Makhmudzoda,
  • S. Yu. Kireev,
  • M. M. Saidzoda,
  • M. R. Rakhimov,
  • S. E. Otadzhonzoda,
  • P. R. Ibragimzoda

摘要

The specific heat capacity of copper-doped alloy SSu3 was determined in the "cooling" mode using the known heat capacity of a reference sample of grade C00 lead. Polynomials describing the cooling rates of the SSu3 alloy samples with copper and the reference sample were obtained by processing their cooling rate curves. Further, using the experimentally determined cooling rate values for the reference sample and the alloy samples and knowing their masses, polynomials were established for the temperature dependence of the heat capacity of the alloys and the reference sample, which are described by a four-term equation. Using integrals of specific heat capacity, mathematical models were established for the temperature dependence of changes in enthalpy, entropy, and Gibbs energy. The obtained dependences showed that with increasing temperature and copper concentration, the heat capacity, enthalpy, and entropy of the SSu3 alloy increase, while the Gibbs energy values decrease.