Influence of Annealing Temperatures on the Structural Behaviour and Electrical Properties of La(FeSi)₁₃ Alloys

Abstract:

This paper study the effect of structural behaviour and electrical properties in cubic NaZn13-type La (FeSi)₁₃ compounds annealed at different high temperatures from 1000oC to 1200oC. The Raman spectroscopy measurement revealed a different level of coexistence of La (FeSi)₁₃-type phase and α-Fe in 1000oC, 1100oC and 1200oC annealed samples. The different level coexistence of the phases suggested that the samples show a significant phase change with different annealing temperature methods. This finding has also supported by impedance analyzer measurement, where the pattern shows that the 1000oC and 1100oC samples have similar behaviour waveform pattern compared to the 1200oC, which has different behaviour. Besides, the impedance pattern clearly shows that the propagation of the signal for the 1000oC and 1100oC before it arrives in the conductor state (R=0.00) has high resistive values compared to 1200oC annealed samples. Further investigation on the electrical properties was done with the conductivity and tan delta measurements. The results show that 1200oC annealed sample have a high value of conductivity (S=18μ S/m) compares with 1100oC (S= 0.1μ S/m) and 1000oC (S=4.89n S/m). The tan delta measurements found that samples annealed at 1200oC temperature has low value of resistivity (tan ɗ = 0.117) compares with 1100oC (tan ɗ = 0.335) and 1000oC (tan ɗ = 0.482) respectively.

• Periodical: Key Engineering Materials (Volume 908)
• Pages: 337-342
• DOI: https://doi.org/10.4028/p-vt55gu
• Online since: January 2022
• Authors: Muhammad Ikmal Zulkifly, Nazrul Fariq Makmor*, Abdul Rashid Abdul Rahman, Fakhroul Ridzuan Hashim, Muhamad Faiz Md Din, Wan Fathul Hakim Wan Zambri
• Keywords: Annealing Treatment, Ball Milling, La (FeSi)13 Compound, Magnetic Refrigeration, Magnetocaloric Effect, Structural Phase Transition

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