Thermoelectric properties for single crystal bismuth nanowires using a mean free path limitation model

2011 ◽  
Vol 110 (5) ◽  
pp. 053702 ◽  
Author(s):  
Daiki Nakamura ◽  
Masayuki Murata ◽  
Hiroya Yamamoto ◽  
Yasuhiro Hasegawa ◽  
Takashi Komine
Keyword(s):  
Single Crystal ◽  
Free Path ◽  
Thermoelectric Properties ◽  
Mean Free Path ◽  
Bismuth Nanowires

The electrical properties of graphite

1953 ◽  
Vol 217 (1128) ◽  
pp. 9-26 ◽  
Keyword(s):  
Single Crystal ◽  
Free Path ◽  
Hall Coefficient ◽  
Mean Free Path ◽  
Free Electrons ◽  
Satisfactory Explanation ◽  
Wide Range ◽  
The Mean ◽  
Positive Holes ◽  
Crystalline Graphite

The Hall coefficient and resistivity of a range of polycrystalline graphites with different crystal sizes and a single crystal of Travancore graphite have been measured over a wide range of temperature. The number of free electrons has been found to be approximately 6x10 18 per cm 3 at room temperature; the variation with temperature cannot be accurately determined. The deficit of electrons in poorly crystalline graphite gives rise to positive Hall coefficients. Quenching removes electrons, and a study of this process has enabled the ratio of the mobilities of positive holes and electrons to be estimated at 0·80. An interesting effect has been observed in the variation of the Hall coefficient of the single crystal with field; no satisfactory explanation has been found for this phenomenon. The resistivity of polycrystalline graphite depends on the density and on the orientation and size of the crystals. From the variation of resistivity with temperature and the size of the crystals, the mean free path due to thermal scattering, has been found to be 2350 Å at 273° K; the variation of mean free path with temperature has been deduced. The product of effective mass and velocity of the free electrons has been determined as a function of temperature; the accuracy is limited by uncertainties in the number of free electrons.

Theoretical modeling of electrical resistivity and Seebeck coefficient of bismuth nanowires by considering carrier mean free path limitation

2017 ◽  
Vol 121 (1) ◽  
pp. 014303 ◽  
Author(s):  
Masayuki Murata ◽  
Atsushi Yamamoto ◽  
Yasuhiro Hasegawa ◽  
Takashi Komine ◽  
Akira Endo
Keyword(s):  
Electrical Resistivity ◽  
Seebeck Coefficient ◽  
Free Path ◽  
Mean Free Path ◽  
Theoretical Modeling ◽  
Bismuth Nanowires

Mean free path limitation of thermoelectric properties of bismuth nanowire

2009 ◽  
Vol 105 (11) ◽  
pp. 113706 ◽  
Author(s):  
Masayuki Murata ◽  
Daiki Nakamura ◽  
Yasuhiro Hasegawa ◽  
Takashi Komine ◽  
Takashi Taguchi ◽  
...  
Keyword(s):  
Free Path ◽  
Thermoelectric Properties ◽  
Mean Free Path ◽  
Bismuth Nanowire

scholarly journals First-principles simulation of electron mean-free-path spectra and thermoelectric properties in silicon

2015 ◽  
Vol 109 (5) ◽  
pp. 57006 ◽  
Author(s):  
Bo Qiu ◽  
Zhiting Tian ◽  
Ajit Vallabhaneni ◽  
Bolin Liao ◽  
Jonathan M. Mendoza ◽  
...  
Keyword(s):  
Free Path ◽  
Thermoelectric Properties ◽  
First Principles ◽  
Mean Free Path ◽  
Electron Mean Free Path

Synthesis and Thermoelectric Properties of NaxCo2O4 Single Crystals

2005 ◽  
Vol 886 ◽  
Author(s):  
Jian He ◽  
Kelvin Aaron ◽  
Edward Abbott ◽  
Joseph Kolis ◽  
Terry M. Tritt
Keyword(s):  
Thermal Conductivity ◽  
High Temperature ◽  
Low Temperature ◽  
Single Crystal ◽  
Temperature Dependence ◽  
Single Crystals ◽  
Free Path ◽  
Mean Free Path ◽  
Flux Method ◽  
Different Types

ABSTRACTSingle crystal NaCo2O4 platelets with sizes up to 6mm were synthesized by the typical high temperature NaCl flux method. The in-plane thermopower α and in-plane resistivity ρ were measured to be ∼100µV/K and 0.3mΩ-cm at 300K, respectively. The in-plane thermal conductivity κ was measured by our custom-designed “PTC” system and found to be ∼5 W-m−1K−1 at 300K, which is 2-3 times larger than the polycrystalline NaCo2O4. The in-plane phonon mean free path lph was estimated to be ∼9.5Å, which is much smaller than the in-plane mean free path of conducting carriers (la∼51Å). A novel low temperature flux method where NaCl/NaOH was used as flux and metallic Co powders as Co source was developed to successfully synthesize Na-deficient NaxCo2O4 crystals with size up to 6mm at low temperature of 550°C. The different temperature dependence in resistivity reveals that two different types of crystals can exist, one is metallic and another is semiconducting. The temperature dependence of the measured k is like that of a disordered solid and the value is found to be ∼7 W-m−1K−1 at 300K.

Inelastic mean free path and phase-shift determinations in NiO, using EXELFS

1993 ◽  
Vol 3 (7) ◽  
pp. 1649-1659
Author(s):  
Mohammad A. Tafreshi ◽  
Stefan Csillag ◽  
Zou Wei Yuan ◽  
Christian Bohm ◽  
Elisabeth Lefèvre ◽  
...  
Keyword(s):  
Phase Shift ◽  
Free Path ◽  
Mean Free Path ◽  
Inelastic Mean Free Path
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