Thermodynamics Properties of nano-size Ferrite and (LaxTh1-x) NiC2 Superconductors

• Main Authors: Lin, S.H., 林世輝
• Other Authors: Y.Y.Chen
• Format: Others
• Language: zh-TW
• Published: 1996
• Online Access: http://ndltd.ncl.edu.tw/handle/37877539652793016693

碩士 === 輔仁大學 === 物理學系 === 84 === We have measured the low-temperature specific heats of nanocrystal ZnFe2O4and superconductor (LaxTh1-x)NiC2 by thermal relaxation technique and comparedthese data with the susceptibility of ZnFe2O4 . Broad peak near 10 K begins to prevail after the sample is annealed at 500Cor 800C ,but the nanoparticles of ball milling and as prepared lead to almost complete disappearance of the low temperature ordering . Such observations canbe understood through the relative distribution of Fe3+ ions between two noneq-uivalent sites in the spinel type lattice . Meanwhile , the lattice heat capac-ity is enhanced due to the size and surface effect . The specific heat measurements of superconductor (LaxTh1-x)NiC2 show a var-iation of Tc with the different ratio of thorium . The maximum value of Tc app-ears at x=0.6 , and decreases by adding or minusing x value .