Electrical resistance, magnetic and thermoelectric properties of the Heusler alloy Co2TiAl obtained by self-propagating high-temperature synthesis

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Abstract

A thermoelectric Co2TiAl alloy was obtained by the SHS-metallurgy method for the first time. The microstructure and the magnetic and thermoelectric properties of the synthesized alloy were investigated. The maximum value of the Seebeck coefficient and thermoelectric power at room temperature were ‒29.5 μV/K and 1230 μW·m–1·K–2, respectively. The comparison of the influence of the SHS-method modifications on the properties of the synthesized alloy was made. It has been shown that the alloy synthesized by SHS pressing has higher thermoelectric characteristics than the alloy obtained by the SHS-metallurgy method.

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About the authors

M. L. Busurina

Merzhanov Institute of Structural Macrokinetics and Materials Science, Russian Academy of Sciences

Author for correspondence.
Email: busurina@ism.ac.ru
Russian Federation, Chernogolovka, Moscow Region, 142432

A. V. Karpov

Merzhanov Institute of Structural Macrokinetics and Materials Science, Russian Academy of Sciences

Email: busurina@ism.ac.ru
Russian Federation, Chernogolovka, Moscow Region, 142432

D. E. Andreev

Merzhanov Institute of Structural Macrokinetics and Materials Science, Russian Academy of Sciences

Email: busurina@ism.ac.ru
Russian Federation, Chernogolovka, Moscow Region, 142432

O. D. Boyarchenko

Merzhanov Institute of Structural Macrokinetics and Materials Science, Russian Academy of Sciences

Email: busurina@ism.ac.ru
Russian Federation, Chernogolovka, Moscow Region, 142432

Yu. G. Morozov

Merzhanov Institute of Structural Macrokinetics and Materials Science, Russian Academy of Sciences

Email: busurina@ism.ac.ru
Russian Federation, Chernogolovka, Moscow Region, 142432

D. M. Ikornikov

Merzhanov Institute of Structural Macrokinetics and Materials Science, Russian Academy of Sciences

Email: busurina@ism.ac.ru
Russian Federation, Chernogolovka, Moscow Region, 142432

A. E. Sytschev

Merzhanov Institute of Structural Macrokinetics and Materials Science, Russian Academy of Sciences

Email: busurina@ism.ac.ru
Russian Federation, Chernogolovka, Moscow Region, 142432

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Supplementary files

Supplementary Files
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2. Fig. 1. Experimental scheme: 1 – initiating coil; 2 – reaction mixture in a quartz glass; 3 – corundum filling; 4 – graphite mold.

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3. Fig. 2. Diffraction patterns of alloys synthesized from reaction mixture I (a) and mixture II (b).

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4. Fig. 3. SEM and EDA data (at.%) of Co2TiAl alloy synthesized by SHS metallurgy.

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5. Fig. 4. Magnetization curves of powder samples: for mixtures I and II and the alloy synthesized in [19].

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6. Fig. 5. Temperature dependence curves of electrical resistance ρ of the samples synthesized in this work (a) and in [19] (b).

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7. Fig. 6. Temperature curves of the Seebeck coefficient for Co2TiAl alloys synthesized in this work (a) and in [19] (b).

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8. Fig. 7. Temperature dependences of the thermoelectric power factor (PF) for the alloys synthesized in this work (a) and in [19] (b).

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