The phase diagrams and thermodynamics of the ZrO2-CaO-MgO and MgO-CaO systems

Neutron Thermodiffractometry Study of Calcium Zirconate/Magnesium Oxide Formation in the ZrO2–CaO–MgO System

“…Table I shows the changes in enthalpy and Gibbs free energy 39 associated with the possible reactions involved in the formation of CaZrO 3 in the ZC and ZD samples. The ⌬H value observed for the three reactions establishes the endothermic character of reactions (2) and (5) and the exothermic effect associated with reaction (4). The values of ⌬G show that reactions (2) and (5) are thermodynamically favorable at temperatures higher than 900°and 600°C, respectively, whereas reaction (4) is thermodynamically favorable at all temperatures.…”

Uniformly Porous Composites with 3‐D Network Structure (UPC‐3D) for High‐Temperature Filter Applications

“…Since 1999, the development of new porous ceramics for high-temperature filter applications has been started, as mentioned before. Considering its high melting temperature, the CaZrO3/MgO system (eutectic temperature: 2030ºC 27 ) is a favorable candidate for such purposes. Fig.…”

Thermodynamic assessment of the system ZrO2–CaO–MgO using new experimental results

“…Lattice stabilities for the stable forms are those proposed by Dinsdale 53 while the metastable forms considered are those reported by Yin and Arget. 20 …”

“…20 By extrapolating their own calculated binary systems on the basis of the Muggianu et al 51 equation, they published isothermal sections between 1250 and 1500 • C, the MgO-CaZrO 3 subsystem and the liquidus surface of the system. The isothermal sections published were consistent with their own experimental data and the liquidus surface of the MgO-CaZrO 3 system was in accordance with the experimental data of de Aza et al 18 The scant and, in some cases, contradictory experimental information on ZrO 2 -CaO-MgO lead the present authors to contribute more experimental data to the system at high temperatures.…”