Effect of fuel type on microstructure and electrical property of combustion synthesized nanocrystalline scandia stabilized zirconia

Comparative studies on synthesis of nanocrystalline Sc2O3–Y2O3 doped zirconia (SYDZ) and YSZ solid solution via modified and classic Pechini method

“…1,2 At atmospheric pressure, it is P2 1 /c monoclinic (m) below 1440 K, P4 2 /nmc tetragonal (t) between 1440 and 2640 K, and Fm3m cubic above 2640 K. 3 The marked volume increase accompanying the tetragonal-tomonoclinic (t -m) phase transition gives rise to large strains, which induce the nucleation of cracks. [4][5][6] Depending on the doping, a range of Y 2 O 3 partially stabilized t ZrO 2 (YSZ) powders can be obtained, with the t and m phase contents varying with the production process. [4][5][6] Depending on the doping, a range of Y 2 O 3 partially stabilized t ZrO 2 (YSZ) powders can be obtained, with the t and m phase contents varying with the production process.…”

“…3 This undesired behavior can be suppressed by doping the t phase with yttria (Y 2 O 3 ). [4][5][6] Tetragonal zirconia can be used as an effective catalyst due to its unique amphoteric characteristics and redox properties. [4][5][6] Tetragonal zirconia can be used as an effective catalyst due to its unique amphoteric characteristics and redox properties.…”

“…[4][5][6] Tetragonal zirconia can be used as an effective catalyst due to its unique amphoteric characteristics and redox properties. [6][7][8][9] The 'non-transformable' metastable tetragonal YSZ phase (called t9) is remarkably resistant and does not undergo the transformation to the monoclinic phase under stresses. This hardening mechanism is due to the transformation of the tetragonal phase into the monoclinic phase, which implies a volume change associated with pseudoplasticity.…”

“…4 The transformable tetragonal zirconia, such as yttria stabilized zirconia (YSZ) (called t-phase), is used as an engineering ceramic material due to its high values of strength and hardness. 5,6 This phase is widely used for thermal barrier coatings (TBCs) applications due to the formation of a tweed microstructure, which tends to increase the thermomechanical performances. [6][7][8][9] The 'non-transformable' metastable tetragonal YSZ phase (called t9) is remarkably resistant and does not undergo the transformation to the monoclinic phase under stresses.…”

“…This hardening mechanism is due to the transformation of the tetragonal phase into the monoclinic phase, which implies a volume change associated with pseudoplasticity. 5,6 The codoped zirconia with scandia and yttria (SYSZ) is an advanced functional material used for high temperature TBCs. The t9 phase is distinguishable by its antiphase domain boundaries and numerous twins.…”