Local structure and dynamics of high temperature SrO–Al2O3 liquids studied by 27Al NMR and Sr K-edge XAS spectroscopy

Thermodynamic Description of $${\hbox{SrO-Al}_{2}\hbox{O}_{3}}$$ System and Comparison with Similar Systems

“…In view of the structural similarity the binary pairs of systems Al 2 O 3 -BaO, Al 2 O 3 -SrO, and Al 2 O 3 -CaO, Al 2 O 3 -MgO, the new model should be suitable to deal with the Al 2 O 3 -BaO and Al 2 O 3 -SrO systems. The idea has been proven correct in the work of Al 2 O 3 -BaO; [3] furthermore, the work of Capron et al [27] has confirmed the coordination number for Al 2 O 3 is four in the liquid phase of Al 2 O 3 -SrO; therefore, the modified model mentioned above was applied in present work. The liquid phase in the Al 2 O 3 -SrO system can be described by the formula (Al 3+ , Sr 2+ ) P (AlO 2 1-, O 2-) Q , where P and Q represent the number of cation and anion sites, which vary with composition:…”

“…However, none of these were used directly in the optimization because of the disparity of these data but were used as reference data to estimate the enthalpy of formation of these compounds. Capron et al [27] investigated the local structure and dynamics of high temperature SrO-Al 2 O 3 liquids studied by 27 Al NMR and Sr K-edge XAS spectroscopy; the results indicated that the Al co-ordination number decreased from typically 4:7 AE 0:3 in Al 2 O 3 liquid down to 4.0 for the liquids with the highest SrO contents; to some extent this satisfies the condition of the newly proposed model for Al 2 O 3 -involved liquid phase. [2] In their study, the melting points of the definite compounds were also tabulated, however, the origin of this value was untraceable and not included in the optimization.…”

Strontium Dialuminate SrAl4O7: Synthesis and Stability

“…13,14 Solidification was obtained by quenching or by cooling the sample at a controlled rate to study the influence of the cooling rate on the crystallization. The collected powders were then heated, in a ventilated furnace, at 5°C/min, to 750°C for 1 h to completely decompose the residual nitrates.…”

In situ high temperature 27Al NMR study of structure and dynamics in a calcium aluminosilicate glass and melt

“…Compared with these nuclei, however, little has been reported about 27 Al NMR relaxation behavior in glasses and melts with increasing temperature. Massiot and co-workers successfully measured in situ, very high temperature (1700-2400 K) 27 Al NMR spectra and T 1 values in molten calcium and strontium aluminates using a laser-heated apparatus and a containerless levitation system [25,35,36]. They demonstrated that measured values of T 1 were almost equal to T Ã 2 derived from the observed line width at half maximum (FWHM) in the extreme, high temperature narrowing limit, x 0 s c ( 1 (x 0 : Larmor frequency, s c : NMR correlation time, see below).…”