Low-temperature transport properties of n-type layered homologous compounds Bi8−xSbxSe7

The n-type chalcogenide Bi8Se7 is the parent compound of a new class of highly-efficient thermoelectric materials for near-room-temperature thermoelectric applications.

Download Full-text

Influence of Nd Substitution by La in on Structural and Transport Properties for Sensing Applications

ISRN Materials Science ◽

10.1155/2013/728195 ◽

2013 ◽

Vol 2013 ◽

pp. 1-10 ◽

Cited By ~ 4

Author(s):

Sudarshan Vadnala ◽

Saket Asthana ◽

Prem Pal ◽

S. Srinath

Keyword(s):

Transport Properties ◽

Room Temperature ◽

Parent Compound ◽

Theoretical Models ◽

Maximum Temperature ◽

Structural Form ◽

Reaction Route ◽

Temperature Coefficients ◽

Sensing Applications ◽

Solid State Reaction Route

The structural and transport properties of manganites with and 0.2 prepared by solid state reaction route are studied. These compounds are found to be crystallized in orthorhombic structural form. A shift in the metal-semiconductor/insulator transition temperature () towards room temperature (289 K) with the substitution of Nd by La, as the value of is varied in the sequence (0, 0.1, and 0.2), has been provided. The shift in the , from 239 K (for ) to near the room temperature 289 K (for ), is attributed to the fact that the average radius of site-A increases with the percentage of La. The maximum temperature coefficients of resistance (TCR) of ( and 0.2) are found to be higher compared to its parent compound which is almost independent of . The electrical resistivity of the experimental results is explored by various theoretical models below and above . An appropriate enlightenment for the observed behavior is discussed in detail.

Download Full-text

A Novel Thermoelectric System with Conductive Metal Rods and its Effective Seebeck Coefficients

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.459.235 ◽

2010 ◽

Vol 459 ◽

pp. 235-238

Author(s):

Tomoyuki Sasaki ◽

Yoshiomi Kondoh ◽

Osamu Hanaizumi ◽

Makoto Goto

Keyword(s):

Low Temperature ◽

Seebeck Coefficient ◽

Thermoelectric Materials ◽

External Load ◽

Room Temperature ◽

Structural Modification ◽

Seebeck Coefficients ◽

Higher Power ◽

Temperature Side

A novel linked thermoelectric system (LTES), fabricated by a simple structural modification of a conventional thermoelectric system (CTES) with the use of conductive metal rods, is characterized experimentally. The LTES generates higher power to the external load in comparison with the CTES, and the power increases with increasing length of the metal rods when the low temperature side of the system is set in the air at room temperature. In addition, measurements of Seebeck voltages of both the systems indicate that the Seebeck coefficient of thermoelectric materials in the LTES is about 1.2 times higher than that in the CTES.

Download Full-text

Synthesis and thermoelectric properties of antifluorite materials

MRS Proceedings ◽

10.1557/proc-1044-u11-03 ◽

2007 ◽

Vol 1044 ◽

Author(s):

Xiunu Sophie Lin ◽

Dongli Wang ◽

Matthew Beekman ◽

George Nolas

Keyword(s):

Low Temperature ◽

Transport Properties ◽

Thermoelectric Properties ◽

Thermoelectric Materials ◽

Group Iv ◽

Optimal Performance ◽

Structure Property ◽

Structure Property Relationships ◽

Elemental Semiconductors

AbstractThe compounds Mg2X (where X=Si, Ge, Sn) crystallize in the antifluorite structure. They possess properties that are similar to that of the group IV elemental semiconductors thus they have long been recognized as good candidates for thermoelectric applications. In addition, their properties can be readily tuned by doping or alloying. However, optimal performance of these materials requires continued investigation. We present low-temperature transport properties measurements of Sb doped Mg2X. Structure-property relationships are reported while their thermoelectric properties are investigated systematically in order to elucidate their potential as thermoelectric materials.

Download Full-text

Highly efficient polymer solar cells based on low-temperature processed ZnO: application of a bifunctional Au@CNTs nanocomposite

Journal of Materials Chemistry C ◽

10.1039/c8tc05653f ◽

2019 ◽

Vol 7 (9) ◽

pp. 2676-2685 ◽

Cited By ~ 2

Author(s):

Chang Li ◽

Ge Wang ◽

Yajun Gao ◽

Chen Wang ◽

Shanpeng Wen ◽

...

Keyword(s):

Solar Cells ◽

Electron Transport ◽

Low Temperature ◽

Transport Properties ◽

Polymer Solar Cells ◽

Trap States ◽

Highly Efficient ◽

Electron Transport Properties

Incorporating Au@CNTs nanocomposite into low-temperature ZnO electron transport layers to suppress the destructive trap states and improve electron transport properties.

Download Full-text

Low Temperature Transport Properties of Ru2Si3 Single Crystals

MRS Proceedings ◽

10.1557/proc-402-581 ◽

1995 ◽

Vol 402 ◽

Cited By ~ 3

Author(s):

U. Gottlieb ◽

R. Madar ◽

O. Laborde

Keyword(s):

Low Temperature ◽

Transport Properties ◽

Single Crystals ◽

Room Temperature ◽

Scaling Law ◽

Band Model ◽

Metal Insulator ◽

Typical Behaviour ◽

Two Band Model ◽

Resistivity Behaviour

AbstractWe present here low temperature transport properties of Ru2Si3 single crystals. Below room temperature the resistivity behaviour of this material is extrinsic. The Hall coefficient is positive down to about 10 K and the becomes negative below. We explain this crossover with a two band model. At very low T, the magnetoresistance of our crystals shows the typical behaviour for a doped semiconductor on the metallic side of the metal-insulator transition and can be described by a scaling law characteristic for weak localisation with strong electronelectron interactions.

Download Full-text

Survival of mouse blastocysts after low-temperature preservation under high pressure

Acta Veterinaria Hungarica ◽

10.1556/avet.52.2004.4.10 ◽

2004 ◽

Vol 52 (4) ◽

pp. 479-487 ◽

Cited By ~ 7

Author(s):

Cs. Pribenszky ◽

M. Molnár ◽

S. Cseh ◽

L. Solti

Keyword(s):

Phase Transition ◽

Hydrostatic Pressure ◽

Low Temperature ◽

High Hydrostatic Pressure ◽

Room Temperature ◽

Freezing Point ◽

Significant Loss ◽

Embryo Cryopreservation ◽

Subzero Temperatures ◽

Survival Capacity

Cryoinjuries are almost inevitable during the freezing of embryos. The present study examines the possibility of using high hydrostatic pressure to reduce substantially the freezing point of the embryo-holding solution, in order to preserve embryos at subzero temperatures, thus avoiding all the disadvantages of freezing. The pressure of 210 MPa lowers the phase transition temperature of water to -21°C. According to the results of this study, embryos can survive in high hydrostatic pressure environment at room temperature; the time embryos spend under pressure without significant loss in their survival could be lengthened by gradual decompression. Pressurisation at 0°C significantly reduced the survival capacity of the embryos; gradual decompression had no beneficial effect on survival at that stage. Based on the findings, the use of the phenomena is not applicable in this form, since pressure and low temperature together proved to be lethal to the embryos in these experiments. The application of hydrostatic pressure in embryo cryopreservation requires more detailed research, although the experience gained in this study can be applied usefully in different circumstances.

Download Full-text