Study of Heat Treatment Effect in MnCoGe Compound on Stucture and Electric Properties

Abstract:

A comprehension about magnetic refrigeration which develops strong materials as the refrigerant will be explained and develop in this project. Magnetic refrigeration comes from magnetocaloric effect (MCE) which is magnetic material known as refrigerant that react with a magnetic and demagnetic field. Refrigerant plays the roll in control the performance of magnetic refrigerator. One of interesting refrigerant is MnCoGe compound which found very favourable in produce high value of MCE. From this point of view, the process of producing of MnCoGe using ball milling treatment and heat treatment had been studied. Variable of temperature in heat treatment process and following by cooling down to room temperature have been implemented in order to produce good structure of MnCoGe compound. Furthermore, from structure properties measurement found this compound produce three type of structures which are hexagonal, orthorhombic and mix structure (hexagonal and orthorhombic). Based on the different temperature of heat treatment, it indicate for 1500^o C and 1200^o C treatment are dominant to the hexagonal structure type, then for 1000^o C dominant to the orthorhombic structure and lastly for 1100^o C dominant to mix structure. Electric properties measurement found the frequency play the role in change the structure as well as in 1000^o C compound was found below 5M Hz frequency show the hexagonal structure and when increasing above 5M Hz the pattern change to orthorhombic structure respectively. Moreover, for the permittivity measurement it gives the information about conductivity and tan delta value. Systematically at 1000^o C compound found this material is more to conductor behavior compare others compound. Therefore, when the temperature is increased to 1100^o C, 1200^o C and 1500^o C then the conductivity value decreasing and its resistivity value become increasing.

• Periodical: Materials Science Forum (Volume 1010)
• Pages: 86-91
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.1010.86
• Online since: September 2020
• Authors: Muhamad Faiz Md Din*, Mohamed Shafie Mohd Jusoh, Abdul Rashid Abdul Rahman, Jian Li Wang, Nurul Hayati Idris, Mohammad Ismail, Wan Fathul Hakim Wan Zambri
• Keywords: Annealing Process, Ball Milling Treatment, Magnetic Refrigeration, MnCoGe Compound

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