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Thermal Conductivity of Solid Triphenyl Phosphite
Alexander Krivchikov1, Ove Andersson2, Oksana Korolyuk1,3
1B. Verkin Institute for Low-Temperature Physics and Engineering of the National Academy of Sciences of Ukraine, 47 Nauky Avenue, 61103 Kharkiv, Ukraine.
Molecules (Basel, Switzerland)
|December 11, 2022
Summary
The thermal conductivity of triphenyl phosphite was studied across various states. Diffuson heat transfer is key in amorphous states and contributes significantly in crystalline phases, impacting thermal conductivity.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Thermodynamics
Background:
- Understanding heat transfer mechanisms in solids is crucial for materials design.
- Triphenyl phosphite exhibits complex phase behavior, including crystalline, glassy, and glacial states.
- Previous studies on thermal conductivity in amorphous solids provide a theoretical framework.
Purpose of the Study:
- To measure and analyze the thermal conductivity (κ) of triphenyl phosphite in various solid states.
- To investigate the temperature and pressure dependencies of heat transfer mechanisms.
- To elucidate the roles of phonons and diffusons in different phases.
Main Methods:
- Transient hot-wire method for thermal conductivity measurement.
- Analysis of temperature and pressure dependencies.
- Application of two-channel heat transfer theory (phonons and diffusons).
Main Results:
- Thermal conductivity (κ) was measured across polymorphic, glassy, and glacial states.
- Weakly temperature-dependent κ in glass/glacial states attributed to diffusons (Arrhenius-type function).
- Strongly temperature-dependent κ in crystal phases shows contributions from both phonons and diffusons, with diffusons playing a pressure-dependent role similar to amorphous states.
Conclusions:
- A transitional pressure-temperature diagram for triphenyl phosphite was presented.
- The theory of two-channel heat transfer effectively describes κ in both crystalline and disordered states.
- The pressure dependence of diffusons suggests a unified heat transfer mechanism across amorphous and crystalline phases.
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