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E0103 - Influence of different amounts of hematite seedings on the temperature of phase transformation of transition aluminas into corundum
Corundum (alpha-Al2O3) is the only stable oxide in the aluminium-oxygen system and is characterized by its high mechanical and chemical stability. But there are some problems in producing very fine corundum powders. Usually alpha-Al2O3 is obtained from transition aluminas at temperatures in the range of 1100-1200¡C. At this temperatures the dispersity of the corundum formed is reduced due to the start of grain growth processes. That is the reason for our investigations in preparing alpha-Al2O3 at lower temperatures. Therefore aluminium-secondary-butoxide was hydrolysed in water and seeded with different amounts of hematite. The dried powders were investigated for instance by using differential thermal analysis. A nearly linear relation between seeding amount and transformation temperature was found. The formation temperature of corundum was decreased by seeding with 10 wt% hematite from about 1100 to 970¡C.
Th. Oberbach, C. Gnther, G. Werner, G. Tomandl and G. Wolf, Thermochimica Acta 271 (1996) 155-162
E0102 - Thermal study of complex formation of triamterene with B-cyclodextrin by spray-drying and co-grinding
The formation of crystalline inclusion complex of triamterene with beta-cyclodextrin (beta-CD) was studied, evaluating the thermal behaviour and dispersion state of this drug in different types of binary systems. Spray-drying and co-grinding (oscillating mill) mixtures of triamterene with beta-CD were prepared in 1:1 molar ratio. The changes of crystalline properties of original (untreated) triamterene, beta-CD, and composites obtained by co-grinding and spray-drying were investigated in comparison with those produced in simple physical mixtures. The thermal behaviour of the different samples was investigated using DTA. X-ray diffraction was applied as a complementary technique. The results have been explained by formation of amorphous drug particles on spray-drying samples and co-grinding or alternatively by means of a solid dispersion formation or a combination of these two. A contamination effect by grinding media was also observed as increasing grinding time.
J.M. Gins, M.J. Arias, C. Novak, P.J. Sanchez-Soto, A. Ruiz-Conde, E. Morillo, Journal of Thermal Analysis and Calorimetry 45 (1995) 659-666
E0101 - Determination of specific surface area of uranium oxide powders using differential thermal analysis technique
The two step oxidation of UO(2+x) and reduction of U3Os powders observed during Differential Thermal Analysis (DTA) has been exploited to determine their Speeifie Surface Areas (SSAs). The results obtained by this method have been compared with the Braunauer, Emmett and Teller (BET) method and are found to be in good agreement in the SSA range of 2-4 m2/gm in the ease of UO(2+x) obtained from ADU route and 4-8 m2/gm in the ease of AUC route. A precision of ± 0.1 m2/gm is obtained. The maximum temperature of oxidation and reduction of these oxides are dependent upon their preparative routes such as Ammonium Diuranate (ADU) and Ammonium Uranyl Carbonate (AUC).
Y. Balaji Rao, R.B. Yadav, R. Narazana Swamy, B. Gopalan, S. Syamsundar, Journal of Thermal Analysis and Calorimetry 44 (1995) 1439-1448
E0100 - The Ag + Au + Pb system : determination of the liquidus surface
The liquidus surface of the Ag + Au + Pb system has been determined by differential thermal analysis. In the temperature range 973-298 K, experiments were performed along the four following sections: = with 0 <xAg < 0.50; = and with 0.30 < xPb < 1; and xPb = 0.4 with 0 < xAg < 0.54. These results allow the liquidus surface and the ternary eutectic valley to be proposed.
S. Hassan, M. Gambino, J.P. Bros, Thermochimica Acta 257 (1995) 83-92
E0099 - Bi, Pb(2212) and Bi(2223) formation in the Bi-Pb-Sr-Ca-Cu-O system
A new route has been found for producing the Bi2Sr2CaCu2Oy, phase with Pb substituted for part of the Bi (denoted Bi,Pb(2212)). By this novel route, Bi,Pb(2212) has been prepared in air at 860 degrees C. For comparison, this phase has also been prepared in argon at 740 degrees C by the previously known route. Bi,Pb(2212) transforms from a tetragonal to an orthorhombic structure as the Pb content grows. Once this phase was obtained with a nominal composition of Bi(2-x)PbxSr2CaCu2Oy, with Pb contents x=0, 0.2, 0.4 and 0.6, the Bi(2223) phase was formed starting from Bi(2212) and Bi,Pb(2212). Single-phase samples were obtained after two heat treatments at 849 degrees C with Bi,Pb(2212) and a proportion of Pb of x=0.4. This proportion corresponds to the one used previously by the authors to obtain high critical current carrying tapes in Ag-clad Bi(2223) tapes.
A. Jeremie, K. Alami-Yadri, J-C. Grivel and R. Flkiger, Superconductor Science and Technology 6 (1993) 730-735
E0097 - Phase transitions of Li2ZrO3 and Li4SiO4 at high temperature
x
T. Tatsuya, M. Tsuneo, JSCTA 104-105
E0096 - Thermal analysis of new glass ceramic composite tapes and their components
Glass ceramic tapes prepared from various AlN, glass and organic binders were studied by simultaneous TG-DTA. Thermooxidative decomposition of polymeric binder, dehydration, oxidation of residual carbon, glass crystallization and oxidation of AlN were detected and evaluated. Results are compared with those obtained with the pure components AlN and glass. The rate of oxidation of various AlN charges at> 800¡C in an air flow depends on their specific surface and eventual special (antihydrolytic) coating. In the ceramic composite the oxidation of AlN is much slower than in free AlN powder because of the embedding in the glass matrix. The glass exhibits crystallization to cordierite, the crystallization rate and final crystallinity depending on the P2O5 and B2O3 contents and the particle size of the glass. In the composite the crystallization of the glass component is accelerated and proceeds to a higher degree owing to the smaller particle size and to interactions between glass and filler. Grinding of the ceramic raw mix results in additional adsorption of moisture.
D. Schultze, W. Schiller and E. Schiller, Thermochimica Acta 246 (1994) 81-97
E0095 - Analyse thermique de mlanges binaires : matrice lipidique (15%) - Principe actif (85%)
x
J. Kaloustian, A.M. Pauli, J. Pastor, JEEP (1994) 47-48
E0093 - Melting of forsterite and spinel, with implications for the glass transition of Mg2SiO4 liquid
x
P. Richet, F. Leclerc, L. Benoist, Geophysical Research Letters 20 (1993) 1675-1678
E0092 - Thermoanalytical investigation of some alkaline earth hydroxide hydrates on application as latent heat storage materials
Owing to their high specific melting enthalpy and the range of the melting temperatures the alkaline-earth hydroxide hydrates Ba(OH)2.8H20 and Sr(OH)2.8H20 are promising latent heat storage materials. The investigations of the melting and solidification behaviour of Sr(OH)2.8H20 and its mixtures with Ba(OH)2.8H20, which had been performed by means of DTA and DSC methods in the closed system with a constant gross composition lead to statements on the melting temperature and specific melting enthalpy vs. concentration. Theoretical storage densities of 532 MJ/m 3 are obtained for the mixture of Ba(OH)2-8H20 and Sr(OH)2.8H20 (80/20) and a value of 655 MJ/m 3 can be achieved for Sr(OH)2.8H20. The kinetics of rehydration to the octahydrates has a great influence on the storage temperature and storage density.
R. Naumann and O. Schatz, Journal of Thermal Analysis 38 (1992) 665-671
E0087 - Etude par analyse thermique de trois matrices lipidiques
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J. Kaloustian, A.M. Pauli, J. Pastor, P. Piccerelle, J. Joachim, JEEP (1992)
E0083 - Polymorphism of Ca3SiO4Cl2 - DTA studies
The studies of calcium chlorosilicate Ca3SiO4Cl2 phase transition by DTA and high temperature calorimetry have been carried out. The temperature of transition as well as heat transition have been elucidated.
K. Miskiewicz and M. Pyzalski, Cement and Concrete Research 18 (1988) 819-822
E0082 - The dehydroxylation of aluminium hydroxides and the kinetics of alpha-Al2O3 formation
Studies were made of the dehydroxylation of several aluminium hydroxide modifications and the kinetics of alpha-Al2O3 formation. The investigated samples differed in both mineral composition and the level of alkali admixtures. It was found that the rate of formation and the quantity of alpha-Al2O3 depend mainly on the purity of the aluminium hydroxides, while the transition forms of alumina depend on the initial type of the aluminium hydroxide.
M. Pyzalski and M. Wojcik, Journal of Thermal Analysis 36 (1990) 2147-2151
E0081 - DTA studies of 12CaO,7Al2O3 polymorphism
The polymorphism of 12CaO.7AI203 has been studied by means of a Setaram G-24 thermoanalyser and by X-ray diffraction using a Philips diffractometer. Thermal treatment was carried out at 1.3 Pa as well as in air atmosphere.
M. Pyzalski, Z. Konik, J. Iwanciw and A. Stock, Journal of Thermal Analysis 32 (1987) 1727-1729
E0080 - Reaction between carbon fibres and molten silicon: heat determination using DTA
The highly exothermic reaction between carbon fibres and molten silicon, which is the basis of SiC--Si composite production, was investigated using a Setararn 2000 K thermoanalyser. DTA curves were recorded in 1.3 Pa vacuum and up to 1770 K, i.e. under the conditions of composite production. The results allowed calculation of the heat of the reaction, which ranged from 91 to 115 k J/tool.
M. Pyzalski, J. Bialoskorski and E. Walasek, Journal of Thermal Analysis 31 (1986) 1193-1196
E0079 - Studies of the reaction between the amorphous carbon and silicon
The kinetic parameters and the mechanism of reaction carbon black-silicon was studied by DTA, QXRD and microscopic methods. The possibility of SiC micropowders production at temperatures below the melting point of silicon was proved.
J. Bialoskorski, M. Pyzalski and E. Walasek, Journal of Thermal Analysis 36 (1990) 2033-2036
E0077 - Heats and entropies of fusion of ABC2 chalcopyrite semiconductors
Using quantitative DTA the melting temperatures and the enthalpies of fusion of some A(I)B(III)C(VI), and A(II)B(IV)C(V), compoundsare measured. The entropies of fusion are calculated and discussed in terms of the dielectric theory, and with regard to the structure of the liquid phase.
G. Kuhn, W. Moller and W. Engel, Thermochimica Acta 78 (1984) 129-134
E0076 - Phase interactions in silicon carbide reinforced composites.
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Y. Bienvenu, J.C. Flour, Y. Favry, A.R. Bunsell, 7th International Conference "The materials revolution through the 90's", Paper 34
E0075 - Quelques possibilits d'application de l'analyse thermique diffrentielle pour l'tude de l'laboration par la mtallurgie des poudres
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Y. Bienvenu, J.C. Le Flour, M. Jeandin
E0074 - Untersuchungen zum thermischen verhalten von NH4Al(SO4)2.12H2O
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H-H. Emons, R. Naumann, K. Khnke, Z. Anorg. Allg. Chem. 577 (1989) 83-92
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