Abstract:

Gd in 4f lanthanon has ferromagnetic-paramagnetism transform temperature (Curie point) and the highest magnetic thermal entropy change at room temperature. So far, it is still the best magnetic refrigeration working substance material. The systems of urea with some alkali metal salts have lower melting point (301~389 K)^[1], greater solubility of metal chloride and higher conductivity^[2]. In this paper, the electrode processes of Ni (Ⅱ) reduced in urea-NaBr melt, electrodeposition of nickel with gadolinium, and the surface morphology and the structural states of electrodeposited films and films after heat treatment have been investigated.