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The thermal conductivity of the methane hydrate CH4 (5.75 H2O) was measured in the interval 2-140 K using the steady-state technique. The thermal conductivity corresponding to a homogeneous substance was calculated from the measured…

无序系统与神经网络 · 物理学 2009-11-10 A. I. Krivchikov , B. Ya. Gorodilov , O. A. Korolyuk , V. G. Manzhelii , H. Conrad , W. Press

The transparent semiconductor In$_{2}$O$_{3}$ is a technologically important material. It combines optical transparency in the visible frequency range and sizeable electric conductivity. We present a study of thermal conductivity of…

材料科学 · 物理学 2021-01-20 Liangcai Xu , Benoit Fauqué , Zengwei Zhu , Zbigniew Galazka , Klaus Irmscher , Kamran Behnia

The thermal conductivity of some orientational glasses of protonated C2H5OH and deuterated C2D5OD ethanol, cyclic substances (cyclohexanol C6H11OH, cyanocyclohexane C6H11CN, cyclohexene C6H10), and freon 112 (CFCl2)2 have been analyzed in…

无序系统与神经网络 · 物理学 2014-04-03 A. I. Krivchikov , G. A. Vdovychenko , O. A. Korolyuk , O. O. Romantsova

The dynamic interaction of a quantum rotor with its crystalline environment has been studied by measurement of the thermal conductivity of solid Kr1_c(CH4)_c solutions at c = 0.05-0.75 in the temperature region from 2 up to 40K. The thermal…

材料科学 · 物理学 2009-11-10 A. I. Krivchikov , B. Ya. Gorodilov , V. G. Manzhelii , V. V. Dudkin

Boron arsenide (BAs) single crystals had been previously reported to have thermal conductivity of 1500 W/mK at room temperature. Now we achieved thermal conductivity above 2100 W/mK at room temperature in BAs crystals due to much lower…

Many complex crystals show a flattening or even increasing lattice thermal conductivity at high temperatures, which deviates from the traditional 1/T decay trend given by conventional phonon theory. In this work, we predict the thermal…

材料科学 · 物理学 2023-12-20 Janak Tiwari , Tianli Feng

The thermal conductivities of beta-Ga2O3 single crystals along four different crystal directions were measured in the temperature range of 80-495K using the time domain thermoreflectance (TDTR) method. A large anisotropy was found. At room…

The thermal conductivity of tetrahydrofuran hydrate has been measured in the temperature region 2 – 220 K by the steady-state potentiometric method. The temperature dependence of the thermal conductivity exhibits behavior typical of…

无序系统与神经网络 · 物理学 2007-05-23 A. I. Krivchikova , V. G. Manzheliia , O. A. Korolyuka , B. Ya. Gorodilova , O. O. Romantsovaa

Methane is thought to have been an important greenhouse gas during the Archean, although its potential warming has been found to be limited at high concentrations due to its high shortwave absorption. We use the Met Office Unified Model, a…

The thermal conductivity of polycrystalline samples of (Na,Ca)Co_2O_4 is found to be unusually low, 20 mW/cmK at 280 K. On the assumption of the Wiedemann-Franz law, the lattice thermal conductivity is estimated to be 18 mW/cmK at 280 K,…

强关联电子 · 物理学 2009-10-31 K. Takahata , Y. Iguchi , D. Tanaka , T. Itoh , I. Terasaki

The author reports an experimental study of electrical and thermal transport in reduced graphene oxide (RGO)/polystyrene (PS) composites. The electrical conductivity ($\sigma$) of RGO/PS composites with different RGO concentrations at room…

材料科学 · 物理学 2017-02-28 Wonjun Park , Jiuning Hu , Luis A. Jauregui , Xiulin Ruan , Yong P. Chen

We report on the first measurement of the thermal conductivity of a suspended single layer graphene. The measurements were performed using a non-contact optical technique. The near room-temperature values of the thermal conductivity in the…

材料科学 · 物理学 2008-03-15 A. A. Balandin , S. Ghosh , W. Bao , I. Calizo , D. Teweldebrhan , F. Miao , C. N. Lau

We study the intrinsic transport properties of suspended graphene devices at high fields (>1 V/um) and high temperatures (>1000 K). Across 15 samples, we find peak (average) saturation velocity of 3.6x10^7 cm/s (1.7x10^7 cm/s), and peak…

介观与纳米尺度物理 · 物理学 2013-12-02 Vincent E. Dorgan , Ashkan Behnam , Hiram J. Conley , Kirill I. Bolotin , Eric Pop

We studied the thermal conductivity of superfluid $^3$He in a 2.5 mm effective diameter and 0.15 m long channel connecting the two volumes of our experimental assembly. The main volume contained pure solid $^4$He, pure liquid $^3$He and…

其他凝聚态物理 · 物理学 2020-01-08 T. S. Riekki , J. T. Tuoriniemi , A. P. Sebedash

The thermal conductivity of solid SF6, CHCI3, C6H6, and CCl4 was investigated by the linear-flow method under saturated vapor pressures in the temperature range from 80 K to the corresponding melting temperatures and then recalculated for a…

无序系统与神经网络 · 物理学 2007-05-23 V. A. Konstantinov , O. I. Purskii , N. N. Zholonko

Hydrides have long been considered promising candidates for achieving room-temperature superconductivity; however, the extremely high pressures typically required for high critical temperatures remain a major challenge in experiment. Here,…

Materials with high thermal conductivity are needed to conduct heat away from hot spots in high power electronics and optoelectronic devices. Cubic boron arsenide (c-BAs) has a high thermal conductivity due to its special phonon dispersion…

Recent experimental developments in hydrogen-rich materials in high pressures have put this class of materials above others in the race toward room temperature superconductivity. As it is the basis of all the materials in this class, the…

超导电性 · 物理学 2022-02-03 Mehmet Dogan , Sehoon Oh , Marvin L. Cohen

The thermal conductivity of monolayer graphene is an outstanding challenge with no consensus reached on its exact value and length convergence so far. We consider four-phonon scattering, phonon renormalization, and an exact solution to…

介观与纳米尺度物理 · 物理学 2023-10-02 Zherui Han , Xiulin Ruan

The lattice thermal conductivity ($\kappa$) of two ceramic materials, cerium dioxide (CeO$_2$) and magnesium oxide (MgO), is computed up to 1500 K using first principles and the phonon Boltzmann Transport Equation (PBTE) and compared to…

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