非晶纳米高熵合金薄膜Nd-Fe-Co-Ni-Mn的电化学制备及磁学性能

Electrochemical Preparation and Magnetic Study of Amorphous Nanostructured Nd-Fe-Co-Ni-Mn High Entropy Alloy Film

通过电沉积方法在室温下制备了具有纳米结构组织的Nd-Fe-Co-Ni-Mn高熵合金磁性薄膜。通过改变电沉积参数,如沉积电位、沉积时间,可控制薄膜的纳米结构及表面形貌。扫描电子显微镜观察结果表明,在Ti基体上,-2.2 V下沉积5 min可制备出大小在200 nm左右的均匀分布的球形颗粒薄膜,延长沉积时间会使薄膜变得更加致密,而沉积电位的负移会导致纳米片的出现。能谱结果表明5种元素发生了共沉积,结构分析表明该薄膜是无定形态的。稀土元素Nd与过渡金属发生共沉积,可能是由于过渡金属离子与二甲基亚砜形成多核配位化合物而使得过渡金属离子沉积电位负移所致。Nd-Fe-Co-Ni-Mn高熵合金薄膜在室温下具有良好的软磁性能。

A facile and efficient synthesis route for the preparation of high entropy Nd-Fe-Co-Ni-Mn alloy films was reported.Here the films with nanostructures were successfully synthesized by electrodeposition at room temperature.By changing the electrodeposition parameters,such as the deposition potential and deposition time,the styles of the nanostructures and surface morphologies of the deposits can be well controlled.The SEM images show that the surfaces of the films,prepared at-2.2 V on Ti substrates for 5 min,are composed of great deal of close-grained and homogeneous nanoparticles with size about 200 nm.The film will become more compact with a longer deposition time.When the deposition potential was shifted negatively without changing other conditions,nanosheets can be successfully prepared.The EDS indicates that the five elements are co-deposited.We conclude a typical induced codeposition of Nd and the transition elements does occur in DMSO.The result of XRD suggested that the film was amorphous.The as-deposited alloys show soft magnetic properties.