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)]

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).

Download Full-text

Cement as a thermoelectric material

Journal of Materials Research ◽

10.1557/jmr.2000.0406 ◽

2000 ◽

Vol 15 (12) ◽

pp. 2844-2848 ◽

Cited By ~ 9

Author(s):

Sihai Wen ◽

D. D. L. Chung

Keyword(s):

Thermoelectric Power ◽

Cement Paste ◽

Carbon Fibers ◽

Cement Matrix ◽

Electron Conduction ◽

Cement Pastes ◽

Hole Conduction ◽

Reinforced Cement ◽

The Absolute ◽

Short Carbon

Cement pastes containing short steel fibers, which contribute to electron conduction, exhibit positive values (up to 68 μV/°C) of the absolute thermoelectric power. Cement pastes containing short carbon fibers, which contribute to hole conduction while the cement matrix contributes to electron conduction, exhibit negative or slightly positive values of the absolute thermoelectric power. The hole and electron contributions in carbon fiber reinforced cement paste are equal at the percolation threshold. Addition of either steel or carbon fibers to cement paste yields more reversibility and linearity in the variation of the Seebeck voltage with temperature difference (up to 65 °C).

Download Full-text

Seebeck Effect in Graphite-Carbon Fiber Cement Based Composite

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.177.566 ◽

2010 ◽

Vol 177 ◽

pp. 566-569 ◽

Cited By ~ 11

Author(s):

Hai Yong Cao ◽

Wu Yao ◽

Jun Jie Qin

Keyword(s):

Carbon Fiber ◽

Seebeck Coefficient ◽

Thermoelectric Power ◽

Seebeck Effect ◽

Graphite Content ◽

Cement Based Materials ◽

Electron Contribution ◽

Reinforced Cement ◽

P Type ◽

High Graphite

The Seebeck effect in carbon fiber reinforced cement-based composite (CFRC) is of interest because it enables the cement-based materials to sense its own temperature without attached or embedded sensor. In this study, the Seebeck coefficient of CFRC and graphite-carbon fiber cement based composite were measured. Results show that the addition of graphite can enhance the Seebeck effect of CFRC. When graphite content is 10wt. %, all types of CFRC show P-type because the hole contribution from carbon fiber dominates the Seebeck effect. When the graphite content is 20wt. %, the change of thermoelectric power (TEP) from positive to negative occurs with the increasing of graphite to carbon fiber ratio (≥25). This phenomenon indicates that compensation takes place between electron contribution from graphite and hole contribution from carbon fiber. At a high graphite content (30wt. %), CFRC shows N-type above a certain temperature difference (20-25°C) since the electrons from graphite dominate the Seebeck effect.

Download Full-text

Estimating Seebeck Coefficient of a p-Type High Temperature Thermoelectric Material Using Bee Algorithm Multi-layer Perception

Journal of Electronic Materials ◽

10.1007/s11664-017-5497-6 ◽

2017 ◽

Vol 46 (8) ◽

pp. 4931-4938 ◽

Cited By ~ 7

Author(s):

Fatih Uysal ◽

Enes Kilinc ◽

Huseyin Kurt ◽

Erdal Celik ◽

Muharrem Dugenci ◽

...

Keyword(s):

High Temperature ◽

Seebeck Coefficient ◽

Thermoelectric Material ◽

Bee Algorithm ◽

P Type

Download Full-text

Correlation of Nonuniformities of the Seebeck Coefficient’s Distribution and the Strain-Stress State in Extruded Thermoelectric Material

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.822.291 ◽

2019 ◽

Vol 822 ◽

pp. 291-297

Author(s):

Arseniy A. Rulimov ◽

Daria D. Kuzavkova ◽

Sergey A. Nemov ◽

Alexandr Maksimovich Zolotov

Keyword(s):

Stress State ◽

Seebeck Coefficient ◽

Thermoelectric Material ◽

Software Package ◽

Hot Extrusion ◽

Extrusion Process ◽

Molding Machine ◽

Accumulated Strain ◽

Strain Stress ◽

P Type

In this work, p-type thermoelectric material was produced by hot extrusion of pre-synthesized in injection molding machine Bi0.5Sb1.5Te3 solid solution. During the research radial distribution of the Seebeck coefficient was confirmed and described in material’s cross section using thermal measuring probe. Such nonuniformity of the Seebeck coefficient is correlated with the strain-stress state of extrudate specifically with the distribution of accumulated strain intensity, which was obtained by mathematical modeling of extrusion process using the software package DEFORM.

Download Full-text