Size-dependent structural and magnetic properties of chemically synthesized Co-Ni-Ga nanoparticles
Co-Ni-Ga, nanoparticles, chemical synthesis, size, magnetic properties
ABSTRACT Phase transitions and magnetic properties of shape-memory materials can be tailored by tuning the size of the constituent materials, such as nanoparticles. However, owing to the lack of suitable synthetic methods for size-controlled Heusler nanoparticles, there is no report on the size dependence of their properties and functionalities. In this contribution, we present the first chemical synthesis of size-selected Co-Ni-Ga Heusler nanoparticles. We also report the structure and magnetic properties of the biphasic Co-Ni-Ga nanoparticles with sizes in the range of 30–84 nm, prepared by a SBA-15 nanoporous silicatemplated approach. The particle sizes could be readily tuned by controlling the loading and concentration of the precursors. The fractions and crystallite sizes of each phase of the Co-Ni-Ga nanoparticles are closely related to their particle size. Enhanced magnetization and decreased coercivity are observed with increasing particle size. The Curie temperature (Tc) of the Co-Ni-Ga nanoparticles also depends on their size. The 84 nm-sized particles exhibit the highest Tc (≈ 1,174 K) among all known Heusler compounds. The very high Curie temperatures of the Co-Ni-Ga nanoparticles render them promising candidates for application in high-temperature shape memory alloy-based devices.
Tsinghua University Press
Changhai Wang,Aleksandr A. Levin,Julie Karel,Simone Fabbrici,Jinfeng Qian,Carlos E. ViolBarbosa,Siham Ouardi,Franca Albertini,Walter Schnelle,Jan Rohlicek,Gerhard H. Fecher,Claudia Felser, Size-dependent structural and magnetic properties of chemically synthesized Co-Ni-Ga nanoparticles. NanoRes.2017, 10(10): 3421–3433