Microstructure and spontaneous magnetostriction in Tb{sub}(0.2)Pr{sub}(0.8)(Fe{sub}(0.4)Co{sub}(0.6)){sub}x (1.65≤x≤1.90)

摘要

The Laves phase compounds RFe{sub}2 (R = rare earth) with a MgCu{sub}2-type cubic structure are well known for their giant magnetostriction as energy-transforming devices; Tb{sub}0.3Dy{sub}0.7Fe{sub}2 (Terfenol-D) is now well established as a transducer material. Theoretical calculation suggests that PrFe{sub}2 has much higher magnetostrain (λ111 =5600ppm) than that of TbFe{sub}2 (λ111= 4400ppm) and DyFe{sub}2 (λ111= 4200 ppm) at 0 K. However PrFe{sub}2 can only be synthesized under high pressures . We have found that Tb{sub}0.2Pr{sub}0.8(Fe{sub}0.4Co{sub}0.6) {sub}1.9 is an anisotropy compensation system with a large magnetostrictionλ111= 2370 ppm n, but that the rare earth-rich and (Th, Pr)(Fe, CO){sub}3 phases tend to be preferentially formed. It has been reported that diminishing the (Fe, Co) content is beneficial to the formation of the Laves phase compound . In this work we have studied the effect of x on the microstructure and the spontaneous magnetostriction of Tb{sub}0.2Pr{sub}0.8(Fe{sub}0.4Co{sub}0.6) {sub}x.