- Thermodynamics and Phase Transformations in Thermoelectric Materials: Applications to the Development of New Materials

2018 ◽  
pp. 101-112
Keyword(s):  
Phase Transformations ◽  
Thermoelectric Materials ◽  
New Materials

Advanced Thermoelectric Materials and Systems for Automotive Applications in the Next Millennium

1997 ◽  
Vol 478 ◽  
Author(s):  
Donald T. Morelli
Keyword(s):  
Environmental Economic ◽  
Physical Properties ◽  
Thermoelectric Properties ◽  
Thermoelectric Materials ◽  
Experimental Results ◽  
Automotive Applications ◽  
New Materials ◽  
Thermoelectric Devices ◽  
Filled Skutterudites ◽  
Fundamental Physical

AbstractA combination of environmental, economic, and technological drivers has led to a reassessment of the potential for using thermoelectric devices in several automotive applications. In order for this technology to achieve its ultimate potential, new materials with enhanced thermoelectric properties are required. Experimental results on the fundamental physical properties of some new thermoelectric materials, including filled skutterudites and 1–1–1 intermetallic semiconductors, are presented.

Phase transformations in rapidly solidified Nd33Fe77 alloy

1992 ◽  
Vol 50 (1) ◽  
pp. 56-57
Author(s):  
A. Zaluska ◽  
L.X. Liao ◽  
X. Chen ◽  
Z. Altounian ◽  
J.O. Ström-Olsen
Keyword(s):  
Phase Transformations ◽  
High Performance ◽  
Melt Spinning ◽  
Permanent Magnets ◽  
New Materials ◽  
Amorphous Precursor ◽  
Eutectic Melting ◽  
Subsequent Transformation ◽  
Fe Alloys ◽  
Rapidly Solidified

Nd-Fe alloys are important for high performance permanent magnets (usually in combination with B, C or N) and a knowledge of the metastable and stable phases of the system is necessary for the development of these new materials. An effective way to investigate such phases is by crystallizing an amorphous precursor.Amorphous ribbons of the binary alloy Nd33Fe77 were produced by melt-spinning. The phase transformations induced by heat treatment of the as-quenched ribbons is complex involving first the production of metastable phases followed by subsequent transformation into stable phases and finally eutectic melting.

Characterization of New Materials in A Four-Sample Thermoelectric Measurement System

2000 ◽  
Vol 626 ◽  
Author(s):  
Nishant A. Ghelani ◽  
Sim Y. Loo ◽  
Duck-Young Chung ◽  
Sandrine Sportouch ◽  
Stephan de Nardi ◽  
...  
Keyword(s):  
Measurement System ◽  
Thermoelectric Materials ◽  
Measurement Techniques ◽  
New Materials ◽  
Thermo Electric ◽  
New Synthesis ◽  
Wide Range ◽  
Materials Research ◽  
Computer Controlled

ABSTRACTSeveral new materials in the CsBi4Te6, A2Bi8Se13, (A = K, Rb, Cs), HoNiSb, Ba/Ge/B (B = In, Sn), and AgPbBiQ3 (Q = S, Se, Te) systems have shown promising characteristics for thermoelectric applications. New synthesis techniques are able to produce samples at much higher rates than previously possible. This has led to a persistent challenge in thermoelectric materials research of rapid and comprehensive characterization of samples. This paper presents a description of a new 4-sample transport measurement system and the related measurement techniques. Special features of the system include fully computer-controlled operation (implemented in LabView™) for simultaneous measurement of electrical conductivity, thermo-electric power, and thermal conductivity. This system has been successfully used to characterize several new thermoelectric materials (including some of the above-mentioned compounds) and reference materials exhibiting a wide range of thermal conductivities.

Measurement Techniques for Thermoelectric Materials and Modules

2003 ◽  
Vol 793 ◽  
Author(s):  
Tim Hogan ◽  
Sim Loo ◽  
Fu Guo ◽  
Jarrod Short
Keyword(s):  
Thermoelectric Materials ◽  
Material Properties ◽  
Coefficient Of Thermal Expansion ◽  
Measurement Techniques ◽  
Theoretical Models ◽  
Large Temperature ◽  
New Materials ◽  
Accurate Analysis ◽  
Module Design ◽  
Insight Into

ABSTRACTThermoelectrics is a multidiscipline area of study, rich in condensed matter physics, chemistry, engineering, and material science. The figure of merit used for evaluating individual materials consists of three interdependent material properties. The measurement of these properties should be taken on the same sample for all three measurements, preferably simultaneously. Each of these measurements requires close attention to potential sources of losses for accurate analysis of the materials and testing of theoretical models. For example, relatively simple scanning measurement techniques can be used to gain insight into accurate geometry measurements and influences of contact dimensions. In addition, the field of thermoelectrics spans a wide temperature range, from cryogenic temperatures to > 1000 °C. This requires systems capable of large temperature variations, and/or multiple measurement systems for various ranges of interest. Additional measurements, such as Hall effect, help to gain further insight into the material properties and their optimization. The number and importance of measurements is further extended as the development of devices from these new materials is initiated, where studies of contact resistance and overall device performance must be evaluated. For mechanical robustness of fabricated modules, properties such as the coefficient of thermal expansion, and grain size for the new materials are of interest. Models for device behavior are useful in evaluating the measured results and further extracting material and device properties. In this paper, we review measurements used in evaluating bulk thermoelectric materials some of the information that can be extracted from these measurements, along with a model that can be used in conjunction with these measurements for module design.

scholarly journals Review on texturization effects in thermoelectric oxides

2020 ◽  
Vol 9 (1) ◽  
Author(s):  
Rishi Prasad ◽  
Shekhar D. Bhame
Keyword(s):  
High Temperature ◽  
Energy Harvesting ◽  
Transport Properties ◽  
Thermoelectric Materials ◽  
Energy Sources ◽  
New Materials ◽  
Thermoelectric Conversion ◽  
Thermoelectric Oxides ◽  
Oxide Thermoelectric Materials ◽  
Thermoelectric Parameters

AbstractSustainable energy sources and energy-harvesting technologies have been researched for decades. Thermoelectric conversion is currently one of the primary foci in this area. Thermoelectric research has been concentrated into two parts—(i) strategies to enhance the efficiency of existing thermoelectric materials and (ii) development of new materials with promising thermoelectric parameters. Although such strategies have led to the improvement of thermoelectric non-oxide-based materials, the limitations possessed by them does not allow to be used at high temperatures. Due to the same reason, oxide-based materials have gained much attention. Here, we discuss about the oxide thermoelectric materials in detail and the effect of texturization on their morphology and transport properties. There is a lot of scope available for such class of materials for high-temperature applications.

Solid State Chemistry Approach to Advanced Thermoelectrics. Ternary and Quaternary Alkali Metal Bismuth Chalcogenides as Thermoelectric Materials

1998 ◽  
Vol 545 ◽  
Author(s):  
Mercouri G. Kanatzidis ◽  
Duck-Young Chung ◽  
Lykourgos Iordanidis ◽  
Kyoung-Shin Choi ◽  
Paul Brazis ◽  
...  
Keyword(s):  
Solid State ◽  
Alkali Metal ◽  
Charge Transport ◽  
Thermoelectric Materials ◽  
Solid State Chemistry ◽  
Exploratory Research ◽  
Next Generation ◽  
New Materials ◽  
Bismuth Chalcogenides ◽  
Solid State Structures

AbstractOur exploratory research to identify new promising candidates for next generation thermoelectric applications has produced several interesting new materials which are briefly described here. We present their compositions, solid state structures, properties and charge transport behavior. The compounds CsBi4Te6, β-K2Bi8Se13, Ba4Bi6Se13, Eu2Pb2Bi6Se13, KBi6.33S10, Eu2Pb2Bi4Se10, Ba2Pb2Bi6S13 and K1.25 Pb3.5Bi7.25Se15 are particularly noteworthy.

New materials obtained from high temperature phase transformations of natural zeolites

1995 ◽  
Vol 14 (23) ◽  
pp. 1653-1656 ◽  
Author(s):  
M. hernandez-velez ◽  
O. Raymond-Herrera ◽  
A. Alvarado-Martin ◽  
A. Jacas-Rodriguez ◽  
R. Roque-Malherbe
Keyword(s):  
High Temperature ◽  
Phase Transformations ◽  
High Temperature Phase ◽  
Temperature Phase ◽  
Natural Zeolites ◽  
New Materials

A new type of defect structure in 124-superconducting oxide revealed by HREM

1991 ◽  
Vol 49 ◽  
pp. 1092-1093
Author(s):  
R. Sharma ◽  
B.L. Ramakrishna ◽  
N.N. Thadhani ◽  
D. Hianes ◽  
Z. Iqbal
Keyword(s):  
Shock Wave ◽  
Defect Structure ◽  
Neutron Radiation ◽  
Weak Links ◽  
Defect Structures ◽  
New Materials ◽  
New Type ◽  
Current Densities ◽  
Processing Techniques ◽  
Microstructural Studies

After materials with superconducting temperatures higher than liquid nitrogen have been prepared, more emphasis has been on increasing the current densities (Jc) of high Tc superconductors than finding new materials with higher transition temperatures. Different processing techniques i.e thin films, shock wave processing, neutron radiation etc. have been applied in order to increase Jc. Microstructural studies of compounds thus prepared have shown either a decrease in gram boundaries that act as weak-links or increase in defect structure that act as flux-pinning centers. We have studied shock wave synthesized Tl-Ba-Cu-O and shock wave processed Y-123 superconductors with somewhat different properties compared to those prepared by solid-state reaction. Here we report the defect structures observed in the shock-processed Y-124 superconductors.

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