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Impact of Silica Additions on the Phase Composition and Electrical Transport Properties of Ruddlesden-Popper $La_{2}NiO_{4+δ}$ Mixed Conducting Ceramics
| Content Provider | MDPI |
|---|---|
| Author | Zakharchuk, Kiryl Bamburov, Aleksandr Naumovich, Eugene N. Vieira, Miguel A. Yaremchenko, Aleksey A. |
| Copyright Year | 2021 |
| Description | The present work explores the possibility of incorporation of silicon into the crystal structure of Ruddlesden-Popper $La_{2}NiO_{4+δ}$ mixed conducting ceramics with the aim to improve the chemical compatibility with lanthanum silicate-based solid electrolytes. Ceramics with the nominal composition $La_{2}Ni_{1−y}Si_{y}O_{4+δ}$ (y = 0, 0.02 and 0.05) were prepared by the glycine nitrate combustion technique and sintered at 1450 °C. While minor changes in the lattice parameters of the tetragonal $K_{2}NiF_{4}$-type lattice may suggest incorporation of a small fraction of Si into the Ni sublattice, combined XRD and SEM/EDS studies indicate that this fraction is very limited (≪2 at.%, if any). Instead, additions of silica result in segregation of apatite-type $La_{10−x}Si_{6}O_{26+δ}$ and $La_{2}O_{3}$ secondary phases as confirmed experimentally and supported by the static lattice simulations. Both total electrical conductivity and oxygen-ionic transport in $La_{2}NiO_{4+δ}$ ceramics are suppressed by silica additions. The preferential reactivity of silica with lanthanum oxide opens a possibility to improve the compatibility between lanthanum silicate-based solid electrolytes and $La_{2}NiO_{4+δ}$-based electrodes by appropriate surface modifications. The promising potential of this approach is supported by preliminary tests of electrodes infiltrated with lanthanum oxide. |
| Starting Page | 82 |
| e-ISSN | 22279717 |
| DOI | 10.3390/pr10010082 |
| Journal | Processes |
| Issue Number | 1 |
| Volume Number | 10 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2021-12-31 |
| Access Restriction | Open |
| Subject Keyword | Processes Ceramics Solid Oxide Fuel Cell Solid Electrolyte Apatite Lanthanum Silicate Ruddlesden-popper Phase Lanthanum Nickelate Electrical Conductivity Oxygen Permeability Electrode Polarization |
| Content Type | Text |
| Resource Type | Article |
