Active and switchable thermal control

Liu, Chenhan; Chen, Yunfei

doi:10.1007/s11433-022-1977-7

Cited by 6 publications

(3 citation statements)

References 13 publications

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“…It is clearly that the WP3 of R 3 phase is much larger than that of C2/m phase, indicating more phonon scattering channels in R 3 structure. To quantify the WP3, the specific heat averaged value is calculated and they are 0.08 ps 4 /rad 4 and 0.02 ps 4 /rad 4 for FM R 3 and NM C2/m, respectively. However, the calculated average Grüneisen parameters at 50 K are 0.6 and 0.9 for FM R 3 and NM C2/m, respectively, implying that R 3 structure has weaker lattice anharmonicity, inconsistent with the shorter phonon lifetime.…”

Section: Resultsmentioning

confidence: 99%

“…Thermal switch, which provides an opportunity for controlling heat flow flexibly, has attracted tremendous attention. [1][2][3][4][5] The performance of thermal switch is estimated by the switching ratio κ on /κ off , where κ on and κ off are the highest and the lowest thermal conductivity during the switching process, respectively. [6,7] Thermal switching can be realized in ferroelectric, ferromagnetic, and ferroelastic materials.…”

Section: Introductionmentioning

confidence: 99%

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Lattice thermal conductivity switching via structural phase transition in ferromagnetic VI₃

Liu

2023

Chinese Phys. B

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The realization of reversible thermal conductivity through ferromagnetic ordering can improve the heat management and energy efficiency in magnetic materials-based devices. VI3, as a new layered ferromagnetic semiconductor, exhibits a structural phase transition from monoclinic (C2/m) to rhombohedral (R3) phase as temperature decreases, making it a suitable platform to investigate thermal switching in magnetic phase transition materials. This work reveals that the thermal switching ratio of VI3 can reach 3.9 along the a-axis. Mechanical properties analysis indicates that the C2/m structure is stiffer than R3 one, causing the larger phonon velocity in C2/m phase. Moreover, due to the fewer phonon branches in C2/m phase, the number of phonon-phonon scattering channels in C2/m phase is smaller compared to R3 phase. Both the larger phonon velocity and the longer phonon lifetime lead to larger lattice thermal conductivity in C2/m phase. This study uncovers the mechanical and thermal properties of VI3, which provides useful guides for designing magnetic materials-based devices such as thermal switch.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Lattice thermal conductivity switching via structural phase transition in ferromagnetic VI₃

Liu

2023

Chinese Phys. B

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“…This work advances the understanding of the effects of phonon bandgap on the phonon-phonon scattering and explores the possibility of TaN in thermal management. [25][26][27]…”

Section: Introductionmentioning

confidence: 99%

Effects of phonon bandgap on phonon–phonon scattering in ultrahigh thermal conductivity θ-phase TaN

Liu

2023

Chinese Phys. B

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Phonon bandgap typically has a significant effect on phonon-phonon scattering process. In this work, the effects of mass modified phonon bandgap in θ-phase TaN are systemically investigated by the means of first-principles calculation with linearized Boltzmann transport equation. Through detailed calculations, we find that phonon bandgap has a significant effect on three-phonon process while exhibits a much weaker effect on four-phonon process. The reason for the ultrahigh thermal conductivity of θ-phase TaN is the long lifetime of phonons including both three-phonon and four-phonon processes, which originates from the weak phonon anharmonicity and large phonon bandgap induced small phonon-phonon scattering phase space. This work advances the understanding of phonon bandgap effects on phonon transport.

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Microscopic mechanism for manipulating thermal conduction

Zhang

2022

Sci. China Phys. Mech. Astron.

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The conduction of heat is one of the fundamental energy transport mechanisms in nature. In addition to the fundamental insights in physics, the study of heat conduction is also valuable for an array of applications, including thermal management, thermal barrier coating and thermal protection, as well as thermoelectrics. Clearly, from various technological aspects, there are quite different expectations in thermal conductivity. Within this context, we are delighted to provide a cutting-edge insight into emerging mechanisms for manipulating thermal conduction, via organizing a special topic with a selection of four Invited Reviews, two Research Articles, and two News & Views. These papers summarize the recent advances in the phonon transport theory, phononic metamaterials, and applications in thermal management and renewable energy.Recently, emerging phonon phenomena have been found. Chen and co-workers [1] summarize the state-of-the-art advances in several fascinating phonon transport phenomena, including the phonon coherence, topological properties of phonons, weak coupling of phonons, and higher-order phonon anharmonicity. Cao and co-workers [2] discuss the possibilities to realize thermal smart materials with tunable thermal conductivity as well as their applications.In nanoscale devices, with the number of interfaces increasing, the interfacial thermal resistance is becoming even more important than the channel material itself. Besides interfacial thermal resistance, an interface may influence phonon anharmonicity. Cai and co-workers [3] review the recent studies of phonon anharmonicity and thermal conductivity of twodimensional van der Waals materials. Graphene has ultrahigh thermal conductivity, which is expected to be utilized in thermal interface materials. Lin and co-workers [4] present the rational design of graphene structures for high performance thermal interface materials. Different mechanisms and design strategies to enhance interfacial thermal conductance are discussed.In the original research article, Zhang and co-workers [5] discuss phonon damping in one-dimensional lattices with asymmetric interaction potential. In the original research article, Huang and co-workers [6] discuss the efficiency limit of thermal concentrators and explore the possible strategies to break such efficiency limit by the concept of conductivity coupling.Strain inevitably exists at interfaces between dissimilar materials. Typically, strain can change lattice structure and thus physical properties. This is especially important in thermal transport at the nanoscale. In the News & Views, Zhan and coworkers [7] discuss the coupled thermal stress and heat at a small scale. In recent years, active and switchable control of thermal conductivity has attracted intensive research interest. In the News & Views, Liu and co-workers [8] introduce the active and reversible modulation in thermal conductivity of different types of solid materials.In conclusion, we would like to thank the authors for providing their important contributions...

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Active and switchable thermal control

Cited by 6 publications

References 13 publications

Lattice thermal conductivity switching via structural phase transition in ferromagnetic VI₃

Lattice thermal conductivity switching via structural phase transition in ferromagnetic VI₃

Effects of phonon bandgap on phonon–phonon scattering in ultrahigh thermal conductivity θ-phase TaN

Microscopic mechanism for manipulating thermal conduction

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Active and switchable thermal control

Cited by 6 publications

References 13 publications

Lattice thermal conductivity switching via structural phase transition in ferromagnetic VI3

Lattice thermal conductivity switching via structural phase transition in ferromagnetic VI3

Effects of phonon bandgap on phonon–phonon scattering in ultrahigh thermal conductivity θ-phase TaN

Microscopic mechanism for manipulating thermal conduction

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Lattice thermal conductivity switching via structural phase transition in ferromagnetic VI₃

Lattice thermal conductivity switching via structural phase transition in ferromagnetic VI₃