The compound CeNi 5Sn was studied by means of X ray powder diffraction technique and refined by Rietveld method. It has a hexagonal structure with space group P 6 3/ mmc (No.194), Z =4, the lattice constant...The compound CeNi 5Sn was studied by means of X ray powder diffraction technique and refined by Rietveld method. It has a hexagonal structure with space group P 6 3/ mmc (No.194), Z =4, the lattice constants a =0 48912(3) nm, c =1 973(2) nm and D x=8 974 g·cm -3 . The Rietveld structural refinement was performed, leading to R p=0 138 and R wp =0 185. The figure of merit F N for the XRD data is F 30 =82 1(0 0068, 54). The X ray powder diffraction data are presented.展开更多
The temperature dependence of standard free energy of formation of LaNi_5,CeNi_5 has been de- termined by galvanic—cell technique using 0.95LaF_3·0.05CaF_2 polycrystalline solid electrolyte.The cell used can be ...The temperature dependence of standard free energy of formation of LaNi_5,CeNi_5 has been de- termined by galvanic—cell technique using 0.95LaF_3·0.05CaF_2 polycrystalline solid electrolyte.The cell used can be expressed as: Mo|La,LaF_3|0.95LaF_3·0.05CaF2|LaNi_5,Ni,LaF_3|Mo(903～1173K) Mo|La|0.95LaF_3·0.05CaF_2|LaNi_5,Ni|Mo(903～1173K) Mo|Ce,CeF_3|0.95LaF_3·0.05CaF_2|CeNi_5,Ni,CeF_3|Mo(873～1023K) The experimental results are as follows: △G_(f,LaNi_5)~0=-152590+13.143T±150 J/mol(903～1173K) △G_(f,CeNi_5)~0=-157600+25.514T±150 J/mol(873～1023K)展开更多
文摘The compound CeNi 5Sn was studied by means of X ray powder diffraction technique and refined by Rietveld method. It has a hexagonal structure with space group P 6 3/ mmc (No.194), Z =4, the lattice constants a =0 48912(3) nm, c =1 973(2) nm and D x=8 974 g·cm -3 . The Rietveld structural refinement was performed, leading to R p=0 138 and R wp =0 185. The figure of merit F N for the XRD data is F 30 =82 1(0 0068, 54). The X ray powder diffraction data are presented.
基金The project supported by the National Natural Science Foundation of China
文摘The temperature dependence of standard free energy of formation of LaNi_5,CeNi_5 has been de- termined by galvanic—cell technique using 0.95LaF_3·0.05CaF_2 polycrystalline solid electrolyte.The cell used can be expressed as: Mo|La,LaF_3|0.95LaF_3·0.05CaF2|LaNi_5,Ni,LaF_3|Mo(903～1173K) Mo|La|0.95LaF_3·0.05CaF_2|LaNi_5,Ni|Mo(903～1173K) Mo|Ce,CeF_3|0.95LaF_3·0.05CaF_2|CeNi_5,Ni,CeF_3|Mo(873～1023K) The experimental results are as follows: △G_(f,LaNi_5)~0=-152590+13.143T±150 J/mol(903～1173K) △G_(f,CeNi_5)~0=-157600+25.514T±150 J/mol(873～1023K)
