ZfN: Search Results

1	Author	Oppermann, S. Herrera, DaoQuoc Huong	Requires cookie*
	Title	Untersuchungen zum chemischen Transport von YX3 mit A1X3 und zur Existenz von gasförmigen und festen Komplexen YA13 X12 (X = Br, I) Investigations on the Chemical Transport Reaction of YX3 with A1X3 and on the Existence of Gaseous and Solid Complexes YA13 X 12 (X = Br, I) H
	Abstract	The dominant gaseous complexes YAl3B r12 and YA13I 12 were generated in the chemical trans port reactions of YBr3 with AlBr3 and YI3 with A1I3. The enthalpy of formation Z\H£(YAl3B r12,gi298) = -484,5 ± 6 kcal/mol and the standard entropy S°(YA13B 12 g 298) = 290,0 ± 7,5 cal/K mol have been calculated. It follows from total pressure measurements of mixtures of YBr3 s with AlBr3 1 and YI3 s with A1I3 b respectively, that complexes YAl3B r12 s and YA13I 12 s do not exist up to the boiling points of the aluminium trihalides.
	Reference	Z. Naturforsch. 53b, 361—366 (1998); eingegangen am 1. Dezember 1997
	Published	1998
	Keywords	Chemical Transport Reaction, Yttrium Aluminium Halides, Enthalpy of Formation, Standard Entropy, Total Pressure Measurements
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	TEI-XML for	default:Reihe_B/53/ZNB-1998-53b-0361.pdf
	Identifier	ZNB-1998-53b-0361
	Volume	53

2	Author	C. Hennig3, H. Oppermann, A. Blonskab	Requires cookie*
	Title	Thermische Zersetzung und Lösungskalorimetrie von Ammoniumeuropiumchloriden Thermal Decomposition and Solution Calorimetry of Ammonium Europium Chlorides
	Abstract	The thermal decomposition equilibria of ammonium europium chlorides (NH4)3EuCl6, (NH4)2EuC15 and NH4Eu2C17 have been investigated by total pressure measurements in a membrane zero manometer. The thermodynamic data of these solid phases have been deri ved from the decomposition functions. The standard enthalpies of solution in 4n HC1 (aq.) of (NH4)3EuC16, (NH4)2EuC15, NH4Eu2C17, EuC13 and Eu20 3 were measured. On the basis of these values and tabulated data, the standard enthalpies at 298 K of the ammonium europium chlorides were derived and compared with the obtained results from the total pressure measu rements. Data by total pressure measurement:
	Reference	Z. Naturforsch. 53b, 1169—1179 (1998); eingegangen am 2. Juni 1998
	Published	1998
	Keywords	Ammonium Europium Chlorides, Europium Chloride, Thermal Decomposition, Standard Enthalpy of Formation, Standard Entropy
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	TEI-XML for	default:Reihe_B/53/ZNB-1998-53b-1169.pdf
	Identifier	ZNB-1998-53b-1169
	Volume	53

3	Author	H. Oppermann, B. Marklein	Requires cookie*
	Title
	Abstract	The heterogeneous reactions: 0 s 0 4 s = 0 s 0 4 g, 2 0 s 0 2,s = Oss + 0 s 0 4 g, Oss + 3 0 s 0 4 g = 4 0 s 0 3 g, 0 s 0 2s + 0 s 0 4 g = 2 0 s 0 3 g and the homogeneous reaction 0 s 0 4 " = 0 s 0 3 g + '/2 0 2 g were determined by total pressure measurements. From this and from chemical transport reactions of 0 s 0 2 and Os with Osmium tetroxide, the enthalpy of formation of gaseous 0 s 0 3 was computed to Z\H ß(0s03 g i98) = -40,0 ± 3 kcal/mol.
	Reference	Z. Naturforsch. 53b, 1352—1364 (1998); eingegangen am 3. Juli 1998
	Published	1998
	Keywords	Osmium Oxides, Chemical Transport Reactions, Total Pressure Measurements, Enthalpy of Formation, Standard Entropy
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	TEI-XML for	default:Reihe_B/53/ZNB-1998-53b-1352.pdf
	Identifier	ZNB-1998-53b-1352
	Volume	53

4	Author	C. Hennig, H. Oppermann	Requires cookie*
	Title	Thermische Zersetzung und Lösungskalorimetrie von Ammoniumneodymbromiden Thermal Decomposition and Solution Calorimetry of Ammonium Neodymium Bromides
	Abstract	The thermal decomposition equilibria of ammonium neodymium bromides (NH4)3NdBr6, (NH4)2NdBr5 and NH4Nd2Br7 have been investigated by total pressure measurements. The thermodynamical data of these solid phase complexes have been derived from the decomposition functions. The standard enthalpies of solution in 4N HBr (aq.) of (NH4)3NdBr6, (NH4)2NdBr5, NH4Nd2Br7, NdBr3 and Nd20 3 were measured. On the basis of these values and tabulated data, the standard enthalpies at 298 K of the ammonium neodymium bromides were derived and compared with the results obtained from the total pressure measurements. Data by total pressure measurement: /\Hß((NH4)3NdBr6 f i98) = -399,1 ± 4,9 kcal/mol; S°((NH4)3NdBr6f298) = 153,4 ± 7,4 cal/K-mol; Z\H£((NH4)2NdBr5 f 298) = -343,0 ± 4,4 kcal/mol; S°((NH4),NdBr5 f ,98) = 109,9 ± 6 , 8 cal/K-mol; ^H ß(N H 4N d,Br7 f 298) = -484,0 ± 5,1 kcal/mol; S°(NH4Nd2Br7 ff<298) = 127,9 ± 6 , 6 cal/K-mol. Data by solution calorimetry: zAHß(NdBr3 , -> 98) = -208,7 ± 1,6 kcal/mol; ^\Hß((NH4)3-NdBr6 f 298) = -404,8 ± 2,7 kcal/mol; _\H^((NH4),NdBr5 f ,98) = -344,2 ± 2,4 kcal/mol; JkHß(NH4Nd2Br7 f 298) = -482,7 ± 3,7 kcal/mol.
	Reference	Z. Naturforsch. 54b, 1283—1294 (1999); eingegangen am 22. Juli 1999
	Published	1999
	Keywords	Ammonium Neodymium Bromides, Neodymium Bromide, Thermal Decomposition, Standard Enthalpy of Formation, Standard Entropy
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	TEI-XML for	default:Reihe_B/54/ZNB-1999-54b-1283.pdf
	Identifier	ZNB-1999-54b-1283
	Volume	54