Thermal conductivity of elemental crystalline silicon clathrate Si[sub 136]

Nolas, G. S.; Beekman, M.; Gryko, J.; Lamberton, G. A.; Tritt, T. M.; McMillan, P. F.
February 2003
Applied Physics Letters;2/10/2003, Vol. 82 Issue 6, p910
Academic Journal
The thermal conductivity and heat capacity of a guest-free polycrystalline silicon clathrate with the type-II hydrate crystal structure is reported. The magnitude of the thermal conductivity at room temperature is only slightly larger than that of vitreous silica, and is thirty times lower than that of diamond structured Si. The temperature dependence of the thermal conductivity of Si[sub 136] follows the well-known Debye form, and is dissimilar to that of clathrates with "guest" atoms inside their polyhedra. The Debye temperature of Si[sub 136], estimated from low temperature heat capacity measurements, is 470 K. The potential of guest-free clathrates for thermoelectric applications is discussed.


Related Articles

  • Transport mechanism in semiconducting glassy silicon vanadates. Ghosh, A. // Journal of Applied Physics;9/15/1993, Vol. 74 Issue 6, p3961 

    Presents a study which examined the electrical transport properties of glassy silicon vanadates. Discussion of the theories used in the study; Information on the temperature dependence of the conductivity; Analysis of the experimental results with reference to the existing theoretical models of...

  • Novel Gold Nanoparticles/Conjugated Molecules Network Structures Fabricated By Self-assembling Process. Akasaka, Tetsuo; Umeno, Akinori; Hong, Su Heon; Hirakawa, Kazuhiko; Araki, Koji // AIP Conference Proceedings;2007, Vol. 893 Issue 1, p361 

    Self-assembled network of gold nanoparticles connected by molecules on SiO2/Si surfaces over macroscopic distances was prepared by alternately dipping substrates into gold nanoparticle- and molecule-solutions. A significant conductivity was observed even after 1 cycle of deposition, suggesting...

  • Low-temperature electric conductivity of Yba[sub 2]Cu[sub 3]O[sub 7-δ] ceramic high-T[sub c] superconductors with different oxygen concentrations. Finkel, V. A. // Low Temperature Physics;Aug/Sep2002, Vol. 28 Issue 8/9, p687 

    The electric conductivity of YBa[SUB2]Cu[SUB3]O[SUB7 - δ] ceramic high-T[SUBc] superconductors with different oxygen contents (6.28⩽7 - δ⩽6.95) is measured in the temperature range ∼20-273 K. It is shown that the temperature dependence of the resistivity can be described by...

  • Magnetoconductivity of Bi2Sr2Ca1-xYxCu2O8+δ in fluctuation regime. Dhard, C. P.; Bhatia, S. N.; Sastry, P. V. P. S. S.; Yakhmi, J. V.; Nigam, A. K. // Journal of Applied Physics;11/15/1994, Vol. 76 Issue 10, p6944 

    Presents a study that investigated the magnetoconductivity of polycrystalline Bi[sub2]Sr[sub2]Ca[sub1-x]Y[subx]Cu[sub2]O[sub8+...] in fluctuation regime. Experimental data; Results of the study.

  • Exact moduli of phase interchange invariant composites with coupled fields. Chen, Tungyang // Journal of Applied Physics;12/15/1995, Vol. 78 Issue 12, p7413 

    Presents information on a study which derived a solution for the exact effective moduli of a two-phase medium for multifield coupled linear responses. Equation for effective conductivity; Parallelism between two-phase media and a two-dimensional polycrystal.

  • On the effective conductivity of polycrystals and a three-dimensional phase-interchange inequality. Avellaneda, M.; Cherkaev, A. V.; Lurie, K. A.; Milton, G. W. // Journal of Applied Physics;5/15/1988, Vol. 63 Issue 10, p4989 

    Discusses a study which derived optimal bounds on the effective conductivity tensor of polycrystalline aggregates by introducing an appropriate null-Lagrangian that is rotationally invariant. Definition of an effective tensor; Optimality conditions from the electric field; Block matrix approach...

  • Specific heat and thermal conductivity of BaTiO[sub 3] polycrystalline thin films. Davitadze, S. T.; Kravchun, S. N.; Strukov, B. A.; Goltzman, B. M.; Lemanov, V. V.; Shulman, S. G. // Applied Physics Letters;3/4/2002, Vol. 80 Issue 9, p1631 

    The results of measurements by the ac heater-probe method of the specific heat and thermal conductivity of polycrystalline BaTiO[sub 3] films with thickness between 1 and 0.1 µm in a temperature range 120-440 K are presented. In the heating and cooling runs, the phase transition anomalies of...

  • Specific heat and magnetic behavior of UTGe compounds. Buschow, K. H. J.; Brück, E.; van Wierst, R. G.; de Boer, F. R.; Havela, L.; Sechovsky, V.; Nozar, P.; Sugiura, E.; Ono, M.; Date, M.; Yamagishi, A. // Journal of Applied Physics;5/1/1990, Vol. 67 Issue 9, p5215 

    Presents a study which examined the temperature dependence of magnetic susceptibility, magnetization, electrical resistivity and specific heat of polycrystalline samples of UTGe compounds. Method used in preparing polycrystalline UTGe; Characteristics of the low-temperature magnetization of...

  • New oxide phase with wide band gap and high electroconductivity, MgIn[sub 2]O[sub 4]. Ueda, Naoyuki; Omata, Takahisa // Applied Physics Letters;10/19/1992, Vol. 61 Issue 16, p1954 

    Examines the optical transparency and electrical conductivity of MgIn[sub 2]O[sub 4] polycrystalline. Details on the optical band gap in the crystal samples; Description of the transmitting wavelength region; Factors influencing the conductivities and optical transmittances of the crystal samples.


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics