Thermodynamic investigation on the Al2O3–BaO binary system

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:…”

“…But it should be pointed out that the mixing enthalpies of Al 2 O 3 -SrO exhibit more negative values than those of Al 2 O 3 -BaO. [3] It appears impossible to obtain a consistent phase diagram when reducing the absolute values of mixing enthalpies of Al 2 O 3 -SrO. Thus, further experimental work is needed to clarify this point in the future.…”

“…Inspired by the work of re-evaluation of the liquid phases in the CaO-Al 2 O 3 and MgO-Al 2 O 3 systems by Mao et al, [2] we have already thermodynamically assessed the BaO-Al 2 O 3 system. [3] The aim of the present work is to review the experimental studies of another one of alkali earth aluminates, i.e., SrOAl 2 O 3 system in order to provide a consistent thermodynamic description for the system with the new liquid model proposed by Mao et al [2] and to compare the thermodynamic properties with correlative systems.…”

A phase equilibria study and thermodynamic assessment of the BaO–Al2O3 system

“…In the equilibration experiment (b), no B 10 A, B 8 A and B 5 A phases reported in the previous work [13,14] could be observed on the basis of XRD analysis listed in Table 5. The results were acquired by inputting XRD patterns of analyzed samples into HighScore Plus 4.1 and comparing with the database included.…”

“…It was mentioned [11] that the stoichiometry of Ba 1.21 Al 11 O 17.71 was tentative and more experimental work was required to confirm it. In the thermodynamic calculation by Ye et al [14], only three compounds, BaAl 2 O 4 , Ba 3 Al 2 O 6 and BaAl 12 O 19 , were included. By considering the controversy of the possible existence of other phases mentioned above, BaAl 12 O 19 was included in the present work for thermodynamic assessment as the stable phase in the Al 2 O 3 rich region.…”