Sublimation behavior

Relatively few thermodynamic studies have been performed on compounds involving Th, U and Pu with noble metals. Most of the previous work has involved electrochemical cell determinations of free energies of formation, hence little has been published concerning the sublimation behavior of actinide intermetallics. 

In the case of PES-CEL fiber blends, the larger part of the liquor is absorbed by the CEL fiber during drying, because of its higher absorption capacity. Nevertheless, in the subsequent thermofixing step, disperse dyes are almost completely fixed to the PES fiber. Transfer from the CEL to the PES fiber occurs both by migration via direct fiber contact and through the gas phase. The type of transfer depends on the sublimation behavior of the dyes [120],... 

Despite the kinetic lability of the Ln-X-cr-bonds (even the thermodynamically very stable Ln-OR bond is subject to rapid ligand exchange reactions [49]) organolanthanide compounds are thermally very robust over a wide range of temperature (Fig. 5) [114, 116, 139, 144-151]. Thermal stability is not only favorable in catalytic transformations at elevated temperatures [47], for the support of volatile molecular precursors is of fundamental importance in chemical vapor deposition techniques the sublimation behavior is a criterion of thermal stability and suitability for these processes (Fig. 5). 

Fig. 5. Sublimation behavior of various lanthanide complexes at 10 3 mbar (OEP = 2, 3, 7, 8,12, 13, 17, 18-octa(ethyl) porphyrin acac = acetylacetonate)...

Scheme 2. Employed CH-alcohols listed according their molecular weight a sublimation behavior is described b Ce(IV) only...

Table 19. Sublimation behavior of selected lanthanide CH-alkoxides...

The adopted value, A H (W20g, g, 298.15 K) = -278.2 kcal mol", was reduced from A H (1450 K) = -272.5 kcal mol", reported by Ackeraann and Rauh ( ). They have studied the sublimation behavior of the tungsten-oxygen system over the temperature range... 

Ackermann and Rauh (1 ) have studied the sublimation behavior of the tungsten-oxygen system over the temperature range from... 

The adopted value, A H (Wg0g, g, 298.15 K) = -483.6 kcal mol", was reduced from A H (Wg0g, g, 1450 K) = -474.1 kcal mol" of Ackermann and Rauh ( ), who studied the sublimation behavior of the tungsten-oxygen system over the temperature range from 1300 to 16000 K by mass spectrometry, mass effusion and x-ray diffraction, and determined A G (W20g, g) = -474,100 + 110.26T cal K" mol" from partial pressure measurements over V-VO (cr). They reviewed the previous determinations (, 2, 3, 4) of the thermodynamic... 

The vapor pressure or the sublimation behavior of organic compounds can by determined conveniently using thermogravimetry. Ashcroft (48), using the Langmuir equation... 

NONANE. SUBLIMATION BEHAVIOR OF FIVE GLOBULAR MOLECULES. 

Sublimation behavior of volatile rare-earth /ff-diketonates... 

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