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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 cellused 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)
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 cellused can expressed as: Mo | La, LaF_3 | 0.95LaF_3 · 0.05 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) △ G_ (f, LaNi_5) ~ 0 = -152590 + 13.143T ± 150 J / mol △ G_ (f, CeNi_5) -157600 + 25.514T ± 150 J / mol (873-1023K)