Thermodynamic assessment of the ternary systems Ga–Mg–O, Ga–Ni–O, Mg–Ni–O and extrapolation to the Ga–Mg–Ni–O phase diagram

Structural and chemical characterization of novel NixZn1−xGa2O4 nanocatalysts at atomic resolution

“…Ni, Ga may be responsible for the adsorption of NO x , and O offers the electrons to transform NO x to NO 3− . The second possible catalytic mechanism is that Ni may occupy tetrahedral Zn sites or octahedral Ga sites [30,31]. During the catalytic reaction, Ni may be hopping from one site to the other, which leads to the transformation of NO x .…”

Thermodynamic modeling of the NiO–SiO2, MgO–NiO, CaO–NiO–SiO2, MgO–NiO–SiO2, CaO–MgO–NiO and CaO–MgO–NiO–SiO2 systems

“…64 Previously, Nussler and Kubaschewski 54 described the MgO-NiO system with the Gibbs energy of liquid deviated slightly positively from an ideal solution. On the other hand, Jakobsson et al 55 and Zinkevich et al 56 considered the liquid phase as an ideal solution due to insufficient thermodynamic data. In the present study, however, a slightly negative deviation of liquid solution from an ideal solution was needed to reproduce the phase diagram by Wartenberg and Prophet, 53 after the optimization of solid MgO-NiO monoxide solution.…”

Solubility limits and LaGaO3 compatibility in the LaO1.5‐GaO1.5‐NiO ternary system

“…The NiO‐GaO 1.5 system is the only bounding quasibinary that shows solid solubility . The similar ionic radii of nickel and gallium allow for significant substitution between the two, but not with the much larger lanthanum ions .…”

“…Although there is no significant solubility of nickel in Ga 2 O 3 , there is considerable solubility of gallium in NiO at higher temperatures. Additionally, a spinel phase with the stoichiometric composition of NiGa 2 O 4 exhibits a wide stability range between a slight nickel excess to a significant gallium excess …”