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<p>This report focuses on heat capacity and thermodynamic properties of crystalline perovskite-like layered oxides: protonated titanate H<sub>2</sub>Nd<sub>2</sub>Ti<sub>3</sub>O<sub>10</sub> and its <i>n</i>-butoxy derivative, designated as H<sub>2</sub>Nd<sub>2</sub>Ti<sub>3</sub>O<sub>10</sub> × BuOH, in the temperature range from 5 to 340&#xa0;K. Isobaric heat capacity of the compounds was measured using precise adiabatic vacuum calorimetry. Standard thermodynamic properties of the oxides were estimated based on the temperature dependencies of the experimental heat capacity. The data obtained allowed us to verify the applicability of the additivity principle for predicting the thermodynamic properties of layered organic<b>–</b>inorganic hybrids. As a result of the experiments, it was established that the principle of additivity is not realized in the case of covalent bonding between the inorganic matrix and organic molecules, which indicates the impossibility of calculating the heat capacity of the hybrid material as the sum of the values for the oxide and organic components, confirming the presence of a covalent bond between them.</p>

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Heat capacity and standard thermodynamic properties of perovskite-type oxide H2Nd2Ti3O10 and organic–inorganic hybrid H2Nd2Ti3O10 × BuOH over the range of (5–340) K

  • 期刊论文

  • 发表日期：

    2025年7月12日

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  • Irina Zvereva,
  • Natalia Smirnova,
  • Anna Sankovich,
  • Sergei Kurnosenko,
  • Vadim Novakowski,
  • Alexey Markin

摘要

This report focuses on heat capacity and thermodynamic properties of crystalline perovskite-like layered oxides: protonated titanate H2Nd2Ti3O10 and its n-butoxy derivative, designated as H2Nd2Ti3O10 × BuOH, in the temperature range from 5 to 340 K. Isobaric heat capacity of the compounds was measured using precise adiabatic vacuum calorimetry. Standard thermodynamic properties of the oxides were estimated based on the temperature dependencies of the experimental heat capacity. The data obtained allowed us to verify the applicability of the additivity principle for predicting the thermodynamic properties of layered organic–inorganic hybrids. As a result of the experiments, it was established that the principle of additivity is not realized in the case of covalent bonding between the inorganic matrix and organic molecules, which indicates the impossibility of calculating the heat capacity of the hybrid material as the sum of the values for the oxide and organic components, confirming the presence of a covalent bond between them.