The size effects in mixed-valence compound CePd3

• Main Authors: Yi-Hsin Lin, 林宜欣
• Other Authors: Yeong-Der Yao
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/83421554244756048466

碩士 === 國立中正大學 === 物理所 === 97 === In a previous study of the mixed valence compounds CePd3, the measurements of resistivity ρ(T), magnetic susceptibility χ(T) and specific heat C(T) were performed to investigate its property of valence fluctuations. In order to study the size effect on it, a series of CePd3 nanoparticles with different sizes was prepared and studied. The size of CePd3 nanoparticles is controlled in a range between 5.2 nm to 9.5 nm, which are confirmed by TEM. As the size decreases to nanoscale, the variation of magnetic property and valence was compared with those of the bulk. The results show a transition from mixed valence state of Cen (n=3.3) to a less magnetic state with Cen (n>3.3). This consequence was further confirmed by the result of 4f electron hybridization with conduction band through X-ray Absorption spectroscopy.