Thermal decomposition and solution calorimetry of ammonium neodymium iodides

被引：0
作者：
Hennig, C [1 ]
Oppermann, H [1 ]
机构：
[1] Tech Univ Dresden, Inst Anorgan Chem, D-01069 Dresden, Germany
来源：
ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES | 2000年 / 55卷 / 01期
关键词：
ammonium neodymium iodides; neodymium iodide; thermal decomposition; thermodynamical data; solution calorimetry;
D O I：
暂无
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
The thermodynamical data of ammonium neodymium iodides (NH4)(3)NdI6 and (NH4)(2)NdI5 were derived by the determination of their decomposition equilibria by total pressure measurements. Moreover, solution calorimetry was applied. The enthalpies of formation of these phases were calculated from their heats of solution and from the enthalpies of formation and the heats of solution of NdI3 and NH4I in 4n HI (aq.) at 298 K. Data by total pressure measurement: Delta H(B)degrees((NH4)(3)NdI6,f,298) = -306,7 +/- 4,9 kcal/mol; S degrees((NH4)(3)NdI6,f,298) = 152,8 +/- 5,7 cal/K.mol; Delta H(B)degrees((NH4)(2)NdI5,f,298) = -260,9 +/- 4,2 kcal/mol; S degrees((NH4)(2)NdI5,f,298) = 114,3 +/- 4,7 cal/K.mol. Data by solution calorimetry: Delta H(B)degrees(NdI3,f,298) = -154,3 +/- 2,0 kcal/mol; Delta H(B)degrees((NH4)(3)NdI6,f,298) = -299,6 +/- 3,2 kcal/mol; Delta H(B)degrees((NH4)(2)NdI5,f,298) = -255,2 +/- 2,8 kcal/mol.
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页码：65 / 73
页数：9
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