The Influence of Al or B on the Thermoelectric Power of Pt/Pt–Rh Thermocouples
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Horst Brodowsky
,
Martin Ketzner
Abstract
Impurities of Al or B exert a strong influence on the absolute thermoelectric power of Pt and Pt–Rh alloys.
There is a change to less negative values in pure Pt and to more negative values in alloys of more than about 6 wt.% Rh. Consequently, the thermoelectric voltage of thermocouples with one leg of pure Pt is much more sensitive to Al or B impurities than thermocouples made of two different Pt-Rh alloys. The dependence of the absolute thermoelectric power on the valence electron concentration of the alloys studied is correlated to the derivative of the molar susceptibility vs valence electron concentration, as called for by various models connecting thermoelectric phenomena to the band structure of the materials.
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We wish to thank Dr. H. Pausch (Institut für Anorganische Chemie der Universität Kiel) for support with the magnetic measurements. We also wish to thank the Degussa AG for providing Pt and Pt–Rh thermocouples free of charge.
Literature
1 Schaller, H.-J.: Z. phys. Chem. N.F. 112 (1978) 85.10.1524/zpch.1978.112.1.085Suche in Google Scholar
2 Brodowsky, H.; Schaller, H.-J.: Trans. Met. Soc. AIME 245 (1969) 1015.Suche in Google Scholar
3 Alqasmi, R; Brodowsky, H.: Z. Metallkd. 77 (1986) 637.Suche in Google Scholar
4 Schaller, H.-J.; Brodowsky, H.: Z. Metallkd. 69 (1978) 87.Suche in Google Scholar
5 Paasch, S.; Schaller, H.-J.: Ber. Bunsenges. Phys. Chem. 87 (1983) 812.10.1002/bbpc.19830870919Suche in Google Scholar
6 Schaller, H.-J.: Ber. Bunsenges. Phys. Chem. 80 (1976) 999.10.1002/bbpc.19760801014Suche in Google Scholar
7 Brodowsky, H.; Ketzner, M.: J. Alloys and Comp. 220 (1995) 101.10.1016/0925-8388(94)06011-8Suche in Google Scholar
8 Ketzner, M.: „Thermodynamische Untersuchung an Pt–Rh–B– Legierungen“, Dissertation, Universität Kiel (1995).Suche in Google Scholar
9 Brodowsky, H.; Sageunkie, H.; Ber. Bunsenges. Phys. Chem 87 (1983).10.1002/bbpc.19830870917Suche in Google Scholar
10 Schaller, H.-J.: Z. Metallkd. 70 (1979) 318.Suche in Google Scholar
11 Ricker, T: Z. Metallkd. 54 (1963) 718.Suche in Google Scholar
12 Ricker, T; Pflüger, E.: Z. Metallkd. 57 (1966) 33.Suche in Google Scholar
13 Krey, C.: „Der Einfluß von Al auf die Thermokraft von Pt–Rh– Legierungen“, Dissertation, Universität Kiel (1997).Suche in Google Scholar
14 Becker, R.: Theorie der Wärme, 2nd ed., Springer-Verlag, Heidelberg (1978) 178, 310, 313.10.1007/978-3-662-10441-5Suche in Google Scholar
15 Mott, N.-F; Jones, H.: The Theory of the Properties of Metals and Alloys, Dover Publ. Inc., New York (1936).Suche in Google Scholar
16 Internationale Temperaturskala 1990 (ITS 90).Suche in Google Scholar
17 Hildebrand, E.: Ann. Phys. 30 (1937) 593.10.1002/andp.19374220703Suche in Google Scholar
© 1998 Carl Hanser Verlag, München
Artikel in diesem Heft
- Frontmatter
- Aufsätze
- The Influence of Al or B on the Thermoelectric Power of Pt/Pt–Rh Thermocouples
- Thermodynamic Modeling of the Co–Dy System
- A Broad Based Analysis of the Thermodynamics of Equation of State of Materials
- Experimental Investigation and Thermodynamic Calculation of the Central Part of the Mg – Al Phase Diagram
- Experimental Liquidus Points and Invariant Reactions in the Cu–Zr System
- Orientation Imaging Microscopy of Alpha Alumina: Sample Preparation and Texture Analysis
- Precipitation and Recrystallization Processes During Ageing of Plastically Deformed Cu-6wt.%Ni-3wt.%Al
- Microstructure, Plastic Deformation Characteristics, and Mechanical Properties of As-cast and Ferritic Heat-treated SG-Iron in a Wide Range of Solidification Cooling Rates
- Microstructure and Mechanical Properties of ( γ + β)-based TiAl Alloys Containing Vanadium and Niobium
- In-situ Formation of TiB2 Reinforced Aluminium via Mechanical Alloying
- The Effect of Combined Forming Methods on the Properties of Al Rods of Circular Cross-section
- Mitteilungen der Deutschen Gesellschaft für Materialkunde e.V.
- Personen
- Buchbesprechungen
- Kalender
Artikel in diesem Heft
- Frontmatter
- Aufsätze
- The Influence of Al or B on the Thermoelectric Power of Pt/Pt–Rh Thermocouples
- Thermodynamic Modeling of the Co–Dy System
- A Broad Based Analysis of the Thermodynamics of Equation of State of Materials
- Experimental Investigation and Thermodynamic Calculation of the Central Part of the Mg – Al Phase Diagram
- Experimental Liquidus Points and Invariant Reactions in the Cu–Zr System
- Orientation Imaging Microscopy of Alpha Alumina: Sample Preparation and Texture Analysis
- Precipitation and Recrystallization Processes During Ageing of Plastically Deformed Cu-6wt.%Ni-3wt.%Al
- Microstructure, Plastic Deformation Characteristics, and Mechanical Properties of As-cast and Ferritic Heat-treated SG-Iron in a Wide Range of Solidification Cooling Rates
- Microstructure and Mechanical Properties of ( γ + β)-based TiAl Alloys Containing Vanadium and Niobium
- In-situ Formation of TiB2 Reinforced Aluminium via Mechanical Alloying
- The Effect of Combined Forming Methods on the Properties of Al Rods of Circular Cross-section
- Mitteilungen der Deutschen Gesellschaft für Materialkunde e.V.
- Personen
- Buchbesprechungen
- Kalender
