Phase relations in the ZrO2–La2O3–Y2O3–Al2O3 system: Experimental studies and phase modelling

Phase equilibria investigations and thermodynamic modeling of the system Bi2O3–Al2O3

“…Moreover, in recent descriptions on systems containing Al 2 O 3 , none have considered the presence of a multicomponent gas phase (i.e. another to the O 2 specie), and gas phase region is not represented in the calculated phase diagram [41,[45][46][47][48][49][50]. Besides, concerning Bi-O system, the experimental studies related to the gas phase based on mass spectroscopy measurements indicated that it consisted mainly of O 2 and Bi species [51][52][53].…”

Thermodynamic Modeling of the HfO2–La2O3–Al2O3 System

“…The calculated results are in good agreement with most experimental data. For La 2 O 3 –Al 2 O 3 system, compared with the previous assessments, the thermal stabilities of LaAl 11 O 18 and LaAlO 3 phases are reduced by making their Gibbs energies more positive to get the tie line between Al 2 O 3 and pyrochlore in agreement with ternary experimental data . We fit the experimental heat capacity of LaAlO 3 with expression of C p = 118.764 + 0.0127 T – 2 760 800 T −2 as seen in Fig.…”

“…The thermodynamic description for La 2 O 3 –Al 2 O 3 system was firstly done by Wu and Pelton . Subsequently, Fabrichnaya et al . reassessed this system because some new calorimetric data for LaAlO 3 were available.…”

“…reassessed this system because some new calorimetric data for LaAlO 3 were available. However, it is difficult to reproduce the experimental phase equilibria of HfO 2 –La 2 O 3 –Al 2 O 3 ternary system using the Gibbs energies of LaAl 11 O 18 and LaAlO 3 reported by Fabrichnaya et al . Furthermore, the recent Gibbs energy of formation for LaAlO 3 measured by Jacob et al .…”

“…Furthermore, the recent Gibbs energy of formation for LaAlO 3 measured by Jacob et al . was not considered in the previous assessments . The HfO 2 –Al 2 O 3 system was assessed by Lysenko and Fabrichnaya et al .…”