The Absolute Scale of Thermoelectric Power at High Temperature

AbstractWe have recently developed a device to measure resistivity and Seebeck values of a material as a function of temperature over a range of 80K < T < 700K. These measurements overlap in temperature with our existing apparatus (4K < T < 320K). These measurements are necessary for the investigation of potential thermoelectric materials at elevated temperatures, where power generation applications are important. The probe design allows for various types of samples to be evaluated from needle like samples ( L ≈ 2mm, D ≈ 50μm ) to larger pressed pellet samples ( ≈ 2mm × 2mm × 10mm). Separate high temperature cartridge heaters are used to stabilize both the absolute temperature, T, as well as the temperature difference, ΔT. Thermocouples measuring T+ΔT/2 and T-ΔT/2 are also employed to measure sample voltages for resistance and thermoelectric power. Design details and measurement specifics will be discussed. Data taken on standards a well as some research samples will be presented.

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Metal-like electrical conductivity in LaxSr2−xTiMoO6 oxides for high temperature thermoelectric power generation

Dalton Transactions ◽

10.1039/c7dt00848a ◽

2017 ◽

Vol 46 (18) ◽

pp. 5872-5879 ◽

Cited By ~ 12

Author(s):

Mandvi Saxena ◽

Tanmoy Maiti

Keyword(s):

Power Generation ◽

Electrical Conductivity ◽

High Temperature ◽

Energy Conversion ◽

Thermoelectric Power ◽

Conversion Efficiency ◽

Energy Conversion Efficiency ◽

Power Generators ◽

Thermoelectric Power Generation

Increasing electrical conductivity in oxides, which are inherently insulators, can be a potential route in developing oxide-based thermoelectric power generators with higher energy conversion efficiency.

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Rapid Synthesis of Bi Substituted Ca3Co4O9 by a Polyacrylamide Gel Method and its High-Temperature Thermoelectric Power Factor

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.434-435.393 ◽

2010 ◽

Vol 434-435 ◽

pp. 393-396 ◽

Cited By ~ 9

Author(s):

Ying Song ◽

Qiu Sun ◽

Li Rong Zhao ◽

Fu Ping Wang

Keyword(s):

High Temperature ◽

Thermoelectric Power ◽

Power Factor ◽

Solid State Reaction Method ◽

Polyacrylamide Gel ◽

Measured Temperature ◽

Thermoelectric Power Factor ◽

Gel Method ◽

Plasma Sintering ◽

Polyacrylamide Gel Method

A series of polycrystalline (Ca1-xBix)3Co4O9 ( x = 0.0 ~ 0.075 ) powders were synthesized rapidly by a polyacrylamide gel method. The dense ceramics were fabricated using the spark plasma sintering ( SPS ) technique. Effects of Bi substitution on high temperature thermoelectric properties of Ca3Co4O9 were evaluated. Both the electrical conductivity and Seebeck coefficient increased with increasing Bi content up to x = 0.05, thus leading to an enhanced thermoelectric power factor. The Bi substituted sample with x = 0.05 obtained in this study has the highest thermoelectric power factor in the measured temperature range. It reaches 4.810-4 Wm-1K-2 at 700 °C, which is 26 % higher than that of Ca3Co4O9 without Bi substitution, and is by up to 15 % larger as compared to the Bi substituted sample synthesized by the solid state reaction method and the SPS technique due to the high chemical homogeneous powder prepared by the polyacrylamide gel method.

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High-Temperature PbTe Thin Films for Use in Cascade Thermoelectric Power Generation

MRS Proceedings ◽

10.1557/proc-793-s11.6 ◽

2003 ◽

Vol 793 ◽

Author(s):

J.B. Posthill ◽

J.C. Caylor ◽

P.D. Crocco ◽

T.S. Colpitts ◽

R. Venkatasubramanian

Keyword(s):

Thin Films ◽

Thermal Conductivity ◽

Power Generation ◽

High Temperature ◽

Ambient Temperature ◽

Thermoelectric Power ◽

Thermal Evaporation ◽

Potential Candidate ◽

Substrate Orientation ◽

Subtle Effect

ABSTRACTPbTe-based thin films were deposited by thermal evaporation at temperatures ranging from ambient temperature to 430°C on different vicinal GaAs (100) substrates and BaF2 (111). This materials system is being evaluated as a potential candidate thermoelectric material for a mid-temperature stage in a cascade power generation module. Pure PbTe, PbSe, and multilayer PbTe/PbSe films were investigated. All films deposited on different vicinal GaAs (100) substrates were found to be polycrystalline when deposited at 250°C or lower. A subtle effect of substrate orientation and multilayer periodicity appears to contribute to the more randomly oriented polycrystallinity, which also lowers the thermal conductivity. These results are compared with PbTe epitaxial results on BaF2 (111).

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Accuracy of the Mekometer Scale

The Canadian Surveyor ◽

10.1139/tcs-1984-0003 ◽

1984 ◽

Vol 38 (1) ◽

pp. 27-33 ◽

Cited By ~ 1

Author(s):

D. Meier ◽

J. M. Rüeger

Keyword(s):

Absolute Scale ◽

Measuring Techniques ◽

The Absolute

The results of recent investigations into the absolute scale of Mekometer measurements and frequency measuring techniques are summarized. On this basis a revised procedure is proposed for the reduction of Mekometer distances.

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Paper 1: “Cement as a Thermoelectric Material,” [J. Mater. Res. 15, 2844-2848 (2000)] And Paper 2: “Rectifying and Thermocouple Junctions Based on Portland Cement,” J. Mater. Res. 16, 1989-1993 (2001)]

Journal of Materials Research ◽

10.1557/jmr.2004.0169 ◽

2004 ◽

Vol 19 (4) ◽

pp. 1294-1294 ◽

Cited By ~ 1

Author(s):

Sihai Wen ◽

D.D.L. Chung

Keyword(s):

Portland Cement ◽

Seebeck Coefficient ◽

Thermoelectric Power ◽

Carbon Fibers ◽

Thermoelectric Material ◽

Steel Fibers ◽

Cement Pastes ◽

The Absolute ◽

P Type ◽

Wrong Sign

In the two papers listed above, the conversion of the Seebeck coefficient (relative to copper) to the absolute thermoelectric power was done by using the wrong sign of the absolute thermoelectric power of copper (2.34 μV/°C). The corrected tables are shown below for both papers. The correction means that plain cement paste is slightly p-type rather than slightly n-type. In addition, it means that cement pastes with carbon fibers are more p-type and those with steel fibers are less n-type than reported. Note in Table III of Paper 2 that all cement pastes are p-type except for paste (ii). Note in Table IV of Paper 2 that all cement junctions are pn-junctions (rather than some being nn+-junctions).

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Thermoelectric power measurements between 300-1200 K using high temperature Peltier modules

10.2514/6.2000-2821 ◽

2000 ◽

Author(s):

H. Scherrer ◽

M. M'Jahed ◽

M. Riffel ◽

C. Roche ◽

S. Scherrer

Keyword(s):

High Temperature ◽

Thermoelectric Power ◽

Peltier Modules ◽

Power Measurements

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Absolute UV Calibration of Rocket Photometers Used to Up-Date the OAO Calibration

Symposium - International Astronomical Union ◽

10.1017/s0074180900103821 ◽

1971 ◽

Vol 41 ◽

pp. 386-389

Author(s):

Albert Gaide

Keyword(s):

Synchrotron Radiation ◽

Energy Distribution ◽

Broad Band ◽

Absolute Scale ◽

Absolute Energy ◽

The Absolute

Accurate rocket observations are needed to estimate the post-launch sensitivity of the Wisconsin OAO instruments and to set the absolute scale of the OAO broad-band photometry and spectrophotometry. Seven broad-band photometers, equipping a pointable Aerobee rocket, are calibrated against a source of synchrotron radiation in an attempt to determine, as accurately as possible, the absolute energy distribution of OAO reference stars. The first flight (July 1st, 1970) failed for technical reasons but the experiment will be repeated in 1971.

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