Jeon Yoontae, Lee Gang Ho, Park Jeunghee, Kim Bongsoo, Chang Yongmin
Department of Chemistry, College of Natural Sciences, Kyungpook National University, Taegu 702-701, South Korea.
J Phys Chem B. 2005 Jun 30;109(25):12257-60. doi: 10.1021/jp050489o.
We produced, for the first time, monodisperse NiH(x) nanoparticles with particle diameters of 7.0 nm and investigated their magnetic properties. We also produced monodisperse Ni nanoparticles with nearly the same particle diameters as those of NiH(x) nanoparticles as a comparison. The magnetic properties of NiH(x) nanoparticles were quite different from those of Ni nanoparticles. We observed two compositional phases in NiH(x) nanoparticles, similar to bulk material: one is the nearly pure Ni phase with the blocking temperature (T(B)) of 11 K and the other is the hydride phase. We observed T(B) of 40 K in Ni nanoparticles.
我们首次制备出了粒径为7.0纳米的单分散NiH(x)纳米颗粒，并对其磁性能进行了研究。作为对比，我们还制备了粒径与NiH(x)纳米颗粒几乎相同的单分散镍纳米颗粒。NiH(x)纳米颗粒的磁性能与镍纳米颗粒的磁性能有很大不同。我们在NiH(x)纳米颗粒中观察到了两个组成相，这与块状材料类似：一个是阻塞温度（T(B)）为11 K的近乎纯镍相，另一个是氢化物相。我们在镍纳米颗粒中观察到的T(B)为40 K。
