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Related Concept Videos

Thermodynamic Potentials01:26

Thermodynamic Potentials

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Thermodynamic potentials are state functions that are extremely useful in analyzing a thermodynamic system. They have dimensions of energy. The four important thermodynamic potentials are internal energy, enthalpy, Helmholtz free energy, and Gibbs free energy. These thermodynamic potentials can be expressed using two of the following variables: pressure, volume, temperature, and entropy. These two variables are expressed as the rate of change of the thermodynamic potential with respect to other...
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Phase Transitions: Melting and Freezing02:39

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Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
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Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...
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Temperature and Thermal Equilibrium01:11

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Heat and temperature are essential concepts for everyone every day. The study of heat and temperature is part of an area of physics known as thermodynamics. It is not always easy to distinguish heat and temperature.
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Sigmatropic rearrangements are a class of pericyclic reactions in which a σ bond migrates from one part of a π system to another. These are intramolecular rearrangements where the total number of σ and π bonds remain unchanged.
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A pure, perfectly crystalline solid possessing no kinetic energy (that is, at a temperature of absolute zero, 0 K) may be described by a single microstate, as its purity, perfect crystallinity,and complete lack of motion means there is but one possible location for each identical atom or molecule comprising the crystal (W = 1). According to the Boltzmann equation, the entropy of this system is zero.
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Stability of SnSe-Based Thermoelectric Compounds.

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Summary

Tin selenide (SnSe) shows promise for thermoelectric devices, but its performance is unstable over time. This study reveals that high ZT values in SnSe materials decline with repeated heating, highlighting stability challenges for practical applications.

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SnSethermal stabilitythermoelectric

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Energy Conversion

Background:

  • Tin selenide (SnSe) is a promising thermoelectric material due to its high figure of merit (ZT) and elemental abundance.
  • Previous studies reported inconsistent performance in polycrystalline SnSe, necessitating investigation into reproducibility factors.
  • Thermoelectric (TE) materials convert heat energy into electrical energy, crucial for waste heat recovery and power generation.

Purpose of the Study:

  • To investigate the influence of sintering temperature on the thermoelectric properties of Br-doped and undoped SnSe.
  • To assess the long-term stability and reproducibility of high ZT values in SnSe materials under thermal cycling.
  • To identify challenges related to ion and defect mobility affecting the durability of SnSe-based thermoelectrics.

Main Methods:

  • Targeted synthesis of Br-doped and undoped SnSe materials.
  • Controlled variation of sintering temperatures during material preparation.
  • Measurement of thermoelectric properties, including the figure of merit (ZT), across multiple heating-cooling cycles.
  • Extended annealing experiments to evaluate long-term material stability.

Main Results:

  • A peak ZT value of 1.04 was achieved at 873 K in synthesized SnSe.
  • Thermoelectric performance, specifically ZT, significantly decreased (approx. 50%) after extended annealing and multiple heating-cooling cycles.
  • The study identified critical challenges in controlling ion and defect mobility, impacting the long-term operational stability of SnSe.

Conclusions:

  • The high ZT values initially observed in SnSe are not sustainable for long-term thermoelectric applications due to performance degradation.
  • Understanding and controlling ion and defect dynamics are crucial for enhancing the stability of SnSe-based thermoelectric devices.
  • Heating-cooling cycle measurements are essential for accurately evaluating the practical potential and long-term performance of thermoelectric materials.