Mass spectrometric study of the thermochemistry of gaseous EuTiO3 and TiO2

Abstract

The gaseous molecule EuTiO3 has been investigated in a high temperature mass spectrometric study of vapors over the europium–titanium–oxygen system. From the enthalpy of reaction: EuTiO3(g)=EuO(g)+TiO2(g) and proper ancillary data, the atomization energy of this molecule has been determined. In addition, from the study of the gaseous exchange reaction: TiO2(g)+Eu(g)=TiO(g)+EuO(g) the dissociation energy of TiO2(g) has been derived and compared with previous results. The dissociation energies proposed are: D○0,at(EuTiO3) =2278±28 kJ mol−1 and D○0,at(TiO2) =1260±12 kJ mol−1.

Gaseous titanium molybdates and tungstates: Thermodynamic properties and structures

“…The enthalpy values of TiXO 4 molecule formation calculated from the enthalpies of reactions (8) and (9) coincided within the measurement errors which justified their averaging. The results obtained are summarized in Tables 4 and 5.…”

“…The enthalpy values of reactions (8)(9)(10)(11) were evaluated with the aid of Eqn. (2) for each specific isomer.…”

“…Combining the average values of the enthalpies of reactions (8)(9)(10)(11), recalculated to the temperature 298 K, with the standard formation enthalpies of the gaseous oxides (kJ/mol), TiO (54.4 ± 8.4), TiO 2 (À305.4 ± 12.6), MoO 2 (À15.6 ± 15.0), MoO 3 (À364.4 ± 15.0), WO 2 (29.1 ± 15.0) and WO 3 (À319.7 ± 15.0), taken from the literature, [12,17] allowed us to calculate the standard formation enthalpies and the standard atomization enthalpies of the gaseous titanium molybdates and tungstates.…”

“…At present only gaseous alkali earth metal and europium titanates are known and their thermodynamic properties have been reported. [8][9][10] Until the present investigation no gaseous salts of titanium were known.…”

Ab initiostudy of neutral (TiO2)nclusters and their interactions with water and transition metal atoms

“…Hence, TiO 2 clusters serve as a model system to understand the photocatalytic and photovoltaic processes, and the nucleation of larger particles. Due to their scientific and technological importance, there are several experimental [35][36][37][38][39][40][41][42][43][44] and theoretical studies on small neutral, negatively and positively charged TiO 2 clusters and nanoparticles [66][67][68][69]. This quite extensive list of theoretical investigations by using density functional based methods can be summarized as follows: for example, Walsh et al [47] have studied the structure, stability and electron affinities of TiO n and TiO − n clusters for n = 1-3.…”