Tạp chí Khoa học và Công nghệ Việt Nam, S. 2C (2017)

Cỡ chữ:  Nhỏ  Vừa  Lớn

A study of the magnetic properties of LaNi5-xSix alloys and their hydrides.

Nhan Ba Dam, Van Tuan Chu, Anh Tuan Do, Quyet Thang Le

Tóm tắt

In this work, we study the influence of the substitution Si for Ni for the magnetic properties of LaNi5-xSix (x = 0-0.5) alloys. The structure of the alloy was tested by X-ray diffraction (XRD) measurements. The magnetic properties of the samples were carried out using a vibrating sample magnetometer (VSM) system. The results showed that when Ni was substituted for Si in alloys and after hydrogen absorption, LaNi5-xSix alloys retained their CaCu5 structure. The susceptibility (χ) of the alloys decreased when substituting Ni by Si increased. The original bulk samples showed a Pauli paramagnetism state after hydrogen absorption transformed into a superparamagnetic state. The results obtained showed that although measurements of magnetic characteristics are relatively simple, quantitative information about the microscopic processes occurring in the material was used as the negative electrode in Ni-MH rechargeable battery.