Thermochemisches und kalorisches Verhalten von NdAl3Cl12 / Thermochemical and Calorical Behaviour of NdAl3Cl12

The thermodynamical data of solid and gaseous aluminium neodymium chloride have been obtained by determination of the decomposition equilibria (of solid) from total pressure measurements and chemical transport reactions (gaseous). The melting diagram was determined by DTA. The enthalpy of formation of the solid phase was calculated from their heats of solution and from the enthalpies of formation and the heats of solution of NdCl3 and AlCl3. Data by total pressure measurement: ΔH°B |(NdAl3Cl12,f,298) = -749,6 ± 2,5 kcal/mol; S°(NdAl3Cl12,f,298) = 118,2 ± 3,0 cal/K·mol. Data by solution calorimetry: ΔH°B(NdAl3Cl12,f,298) = -748,6 ± 1,3 kcal/mol. Data by chemical transport:ΔH°B(NdAl3Cl12,g,298) = -701,5 ± 3,0 kcal/mol; S°(NdAl3Cl12,g,298) = 215,0 ± 4,0 cal/K-mol.

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Thermisches und kalorisches Verhalten von festem LaAl3Br12 und chemischer Transport von LaBr3 mit AlBr3 / Thermical and Calorical Behaviour of Solid LaAl3Br12 and Chemical Transport of LaBr3 with AlBr3

Zeitschrift für Naturforschung B ◽

10.1515/znb-2001-0908 ◽

2001 ◽

Vol 56 (9) ◽

pp. 908-916 ◽

Cited By ~ 3

Author(s):

H. Oppermann ◽

H. Dao Quoc ◽

M. Zhang-Preβe

Keyword(s):

Binary System ◽

Enthalpy Of Formation ◽

Total Pressure ◽

Chemical Transport ◽

Pressure Measurements ◽

Melting Diagram ◽

Calorimetric Measurements ◽

The Enthalpy Of Formation

Abstract The thermodynamical data of solid Lanthanum Aluminium Bromide LaAl3Br12 have been obtained by determination of the decomposition equilibria from total pressure measurements. For different compositions LaBr3/AlBr3, the barogram of the binary system LaBr3-AlBr3 was constructed and from this and DTA the melting diagram was determined. The chemical trans port of LaBr3 with AlBr3 is suggesting the existence of two gaseous complexes LaAl3Br12 and LaAl2Br9.The data are:ΔH°B(LaAl3Br12,f,298) =-587,2 ± 7 kcal/mol, S°(LaAl3Br12,f,298) = 179,3 ± 7 cal/K·mol;ΔH°B(LaAl3Br12,g,298) =-548,7 ± 5 kcal/mol, S°(LaAl3Br12,g,298) = 239,4 ± 6 cal/K·mol;ΔH°B(LaAl2Br9,g,298) =-619,7 ± 5,5 kcal/mol, S°(LaAl2Br9,g,298) = 212,0 ± 7 cal/K·mol.From solution calorimetric measurements follows the enthalpy of formation of the solid complexes: ΔH°B(LaAl3Br12,f,298) =-590,9 ± 3 kcal/mol.

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Thermische Zersetzung und Lösungskalorimetrie von Ammoniumneodymiodiden / Thermal Decomposition and Solution Calorimetry of Ammonium Neodymium Iodides

Zeitschrift für Naturforschung B ◽

10.1515/znb-2000-0112 ◽

2000 ◽

Vol 55 (1) ◽

pp. 65-73 ◽

Cited By ~ 3

Author(s):

C. Hennig ◽

H. Oppermann

Keyword(s):

Thermal Decomposition ◽

Pressure Measurement ◽

Total Pressure ◽

Solution Calorimetry ◽

Enthalpies Of Formation ◽

Pressure Measurements ◽

Heats Of Solution

The thermodynamical data of ammonium neodymium iodides (NH4)3NdI6 and (NH4)2NdI5 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 N dl3 and NH4I in 4n HI (aq.) at 298 K.Data by total pressure measurement:⊿H°B(NH4)3NdI6,f,298) = -306,7 ± 4,9 kcal/mol;S°((NH4)3NdI6,f,298) = 152,8 ± 5,7 cal/K·mol;⊿H°B(NH4)2NdI5,f,298) = -260,9 ± 4,2 kcal/mol;S°((NH4)2NdI3,f,298) = 114,3 ± 4,7 cal/K·mol.Data by solution calorimetry:⊿H°B(NdI3,f,298) = -154,3 ± 2,0 kcal/mol;⊿H°B((NH4)3NdI6,f,298) = -299,6 ± 3,2 kcal/mol;⊿H°B((NH4)2NdI5,f,298) = -255,2 ± 2,8 kcal/mol.

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Thermische Zersetzung und Lösungskalorimetrie von Ammoniumneodymchloriden/Thermal Decomposition and Solution Calorimetry of Ammonium Neodymium Chlorides

Zeitschrift für Naturforschung B ◽

10.1515/znb-1998-0209 ◽

1998 ◽

Vol 53 (2) ◽

pp. 175-183 ◽

Cited By ~ 6

Author(s):

C. Hennig ◽

H. Oppermann

Keyword(s):

Thermal Decomposition ◽

Pressure Measurement ◽

Total Pressure ◽

Solution Calorimetry ◽

Enthalpies Of Formation ◽

Heats Of Solution

Abstract The thermodynamical data of ammonium neodymium chlorides (NH4)2NdCl5 and NH4Nd2Cl7 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 NdCl3 and NH4Cl.Data by total pressure measurement:ΔH°B((NH4)2NdCl5,f,298) = - 412,5 ± 3,6 kcal/mol;S°((NH4)2NdCl5 f 298) = 80,1 ± 5,8 cal/K · mol;ΔH°B(NH4Nd2Cl7,f,298) = -579,5 ± 3,5 kcal/mol;S°(NH4Nd2Cl7,f,298) 101,8 ± 5,6 cal/K mol.Data by solution calorimetry:ΔH°B(NdCl3,f,298) = -251,2 ± 0,7 kcal/mol;ΔH°B((NH4)2NdCl5,f,298) = -405,5 ± 1,0 kcal/mol;ΔH°B(NH4Nd2Cl7,f, 298) = -576,8 ± 1,7 kcal/mol.

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Thermisches Verhalten von festem LaAlCl6 und chemischer Transport von LaCl3 mit AlCl3/Thermical Behaviour of Solid LaAlCl6 and Chemical Transport of LaCl3 with AlCl3

Zeitschrift für Naturforschung B ◽

10.1515/znb-1999-1113 ◽

1999 ◽

Vol 54 (11) ◽

pp. 1410-1416 ◽

Cited By ~ 4

Author(s):

H. Oppermann ◽

H. Dao Quoc ◽

A. Morgenstern

Keyword(s):

Total Pressure ◽

Chemical Transport ◽

Lanthanum Chloride ◽

Pressure Measurements ◽

Melting Diagram

The thermodynamical data of solid aluminium lanthanum chloride LaAlCl6 have been obtained by determination of the decomposition equilibria from total pressure measurements. The melting diagram was determined by DTA. The chemical transport of LaCl3 with AlCl3 is suggesting the existence of the gaseous complex LaAl3Cl12. The data are:ΔH(LaAlCl6f,298) =-427,1 ±2,5 kcal/mol, S°(LaAlCl6,f,298) = 61 ±2,5 cal/K-mol,Δ(LaAl3Cl12,g ,298) =-712 ± 7 kcal/mol, S°(LaAl3Cl12,g,298) = 205 ± 3 cal/K-mol.

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Thermochemische Untersuchungen zum ternären System Bi/Se/O. II. Das Teilsystem Bi2O3– SeO2/Thermochemical Investigations on the Ternary System Bi/Se/O.II.The Binary System Bi2O3–SeO2

Zeitschrift für Naturforschung B ◽

10.1515/znb-1999-0213 ◽

1999 ◽

Vol 54 (2) ◽

pp. 239-251 ◽

Cited By ~ 13

Author(s):

H . Oppermann ◽

H . Göbel ◽

H . Schadow ◽

P. Schmidt ◽

C. Hennig ◽

...

Keyword(s):

Phase Diagram ◽

Total Pressure ◽

Room Temperature ◽

Solution Calorimetry ◽

Enthalpies Of Formation ◽

Standard Entropy ◽

Pressure Measurements ◽

Standard Enthalpies Of Formation ◽

Higher Temperature ◽

The Enthalpy Of Formation

We describe the existence of six thermodynamically stable phases on the binary line Bi2O3- SeO2 at room temperature: Bi12SeO20, Bi10Se2O19, Bi16Se5O34, Bi2SeO5, Bi2Se3O9 and Bi2Se4O11. At higher temperature we optained evidence for Bi20Se3O36 and Bi4SeO8. The decomposition pressures were measured for all phases in a membrane zero manometer and the enthalpy of formation and the standard entropy was determined. The phase barogram and phase diagram followed from total pressure measurements and differential thermoanalysis. The standard enthalpies of formation of all phases were also derived from solution calorimetry. The necessary data of transitions on molar enthalpies were obtained by DSC- and Cp-measurements.

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Thermische Zersetzung und Lösungskalorimetrie von Ammoniumsamariumchloriden/Thermal Decomposition and Solution Calorimetry of Ammonium Samarium Chlorides

Zeitschrift für Naturforschung B ◽

10.1515/znb-1997-1213 ◽

1997 ◽

Vol 52 (12) ◽

pp. 1517-1525 ◽

Cited By ~ 6

Author(s):

C. Hennig ◽

H. Oppermann

Keyword(s):

Thermal Decomposition ◽

Pressure Measurement ◽

Total Pressure ◽

Solution Calorimetry ◽

Enthalpies Of Formation ◽

Pressure Measurements ◽

Heats Of Solution ◽

Solid Phases

Abstract We determined the decomposition equilibria of ammonium samarium chlorides (NH4)2SmCl5 and NH4Sm2Cl7 by total pressure measurements and derived their thermody namical data from the decomposition functions. The enthalpies of formation were compared with the results of the solution calorimetry. The heats of solution of all solid phases in the system SmCl3-NH4Cl and of Sm2O3 were measured in 4n HCl. The enthalpies of formation of ammonium samarium chlorides were derived from the enthalpies of formation of SmCl3 and of NH4Cl and their heats of solution.Data by total pressure measurementΔH°B((NH4)2SmCl5,f,298) =-407,7 ± 2,9 kcal/mol;S0((NH4)2SmCl5,f,298) = 84,0 ± 4,5 cal/K-mol;ΔH°B((NH4)Sm2Cl7,f,298) = -576,8 ± 3,4 kcal/mol;S°(NH4Sm2Cl7,f,298) = 98,1 ± 5,5 cal/K-mol.Data by solution calorimetryΔH°B(SmCl3,f,298) = -248,1 ± 0,8 kcal/mol;ΔH°B((NH4),SmCl5,f,298) = -404 ,3 ± 1,1 kcal/mol;ΔH°B(NH4Sm9Cl7,f,298)= -572,3 ± 1,8 kcal/mol.

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Untersuchungen zum ternären System Bi/Te/O, III. Bestimmung thermodynamischer Daten der ternären Verbindungen/Investigations on the Ternary System Bi/Te/O,III. Determination of Thermodynamic Data of Ternary Compounds

Zeitschrift für Naturforschung B ◽

10.1515/znb-1999-0214 ◽

1999 ◽

Vol 54 (2) ◽

pp. 252-260 ◽

Cited By ~ 4

Author(s):

P. Schmidt ◽

C. Hennig ◽

H. Oppermann

Keyword(s):

Solid State ◽

Ternary System ◽

Thermodynamic Data ◽

Phase Relations ◽

Solid State Reactions ◽

Enthalpies Of Formation ◽

Ternary Compounds ◽

Heats Of Solution

The phase relations in the ternary system Bi/Te/O have been determined in previous studies by solid state reactions. Thermodynamical data have now been obtained for the pertinent equilibria. The heats of solution of Bi2O3, Bi12TeO20, Bi10Te2O19, Bi16Te5O34, Bi2TeO5, Bi2Te2O7, Bi2Te4O11 and TeCl4 were determined in 4N HCl. From these the enthalpies of formation of bismuth tellurites at 298 K have been derived:⊿H°b (Bi12TeO20, f, 298) = -901,6 ± 8 kcal/mol,⊿H°b (Bi10Te2O19, f, 298) = -856,1 ± 9 kcal/mol,⊿H°b (Bi16Te5O34, f, 298) = -1519,5 ± 17 kcal/mol,⊿H°b (Bi2TeO5, f, 298)= -222,8 ± 3 kcal/mol,⊿H°b (Bi2Te2O7, f, 298)= -299,4 ± 4 kcal/mol,⊿H°b (Bi2Te4O11, f, 298)= -448,2 ± 7 kcal/mol.

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