Journal Article

Effects of Ti and Sn Substitutions on Magnetic and Transport Properties of the TiFesub.2Sn Full Heusler Compound

Assahsahi, Ilhame, Galatanu, Magdalena, Popescu, Bogdan, Galatanu, Andrei

2024

Overview

The synthesis of polycrystalline TiFe[sub.2]Sn samples by a route including arc melting and spark plasma sintering with Hf, Y, and In substitutions at the Ti and Sn sites is investigated. For a reduced amount of substitution, around 2 at%, the samples are single phase, while for increased amounts, secondary phases segregate. As is characteristic of these compounds, the Fe-Ti atomic disorder generates a weak ferromagnetic ordering, which is also influenced by the type of substitutional atoms and the secondary phases in the samples with a higher Hf content. The Seebeck coefficient values show an increase for Ti[sub.0.98]Hf[sub.0.02]Fe[sub.2]Sn and for samples with an adjusted Sn content, resulting in slightly increased power factor values. These values reach a maximum for Ti[sub.0.98]Hf[sub.0.02]Fe[sub.2]Sn at approximately 300 K and for TiFe[sub.2]Sn[sub.1.05] at approximately 325 K, namely, 2.69 × 10⁻[sup.4] Wm[sup.−1]K[sup.−2] and 2.52 × 10⁻[sup.4] Wm[sup.−1]K[sup.−2], respectively. The thermal conductivity of all the samples with substitutions increases with respect to the pristine sample. The highest figure of merit value of 0.016 is also obtained for Ti[sub.0.98]Hf[sub.0.02]Fe[sub.2]Sn at 325 K.

• Publisher: MDPI AG
• Subject: Ferromagnetism