Oxygen nonstoichiometry and some transport properties of LaSrNiO4âδ nickelate
| Autor: | H. Ullmann, V.V Vashook, L. V. Makhnach, N.E. Trofimenko |
|---|---|
| Rok vydání: | 2000 |
| Předmět: |
Inorganic chemistry
Composite number Analytical chemistry chemistry.chemical_element General Chemistry Partial pressure Atmospheric temperature range Condensed Matter Physics Oxygen Oxygen permeability Tetragonal crystal system chemistry Electrical resistivity and conductivity visual_art visual_art.visual_art_medium General Materials Science Ceramic |
| Zdroj: | Solid State Ionics. 131:329-336 |
| ISSN: | 0167-2738 |
| DOI: | 10.1016/s0167-2738(00)00571-3 |
| Popis: | Oxygen nonstoichiometry and electrical conductivity of LaSrNiO4−δ nickelate were investigated and oxygen permeability of LaSrNiO4−δ+40% Ag composite ceramics was estimated. The oxygen content in LaSrNiO4−δ changes from 3.99 to 3.45 in the temperature range 600–1000°C at oxygen partial pressures 100 to 2 Pa. The decrease of oxygen content in nickelate takes place by removing it from vertexes of NiO6 octahedrons which form the perovskite layers within the lattice of nickelate. This causes an increase of the c parameter and a decrease of the a parameter of the tetragonal cell of nickelate. The cell volume of the crystal remains constant. The nickelate studied appeared to be p-type conductor with a metallic-like temperature function of the electrical conductivity. At the same experimental conditions the oxygen permeability of LaSrNiO4−δ+40% Ag composite is lower by a factor of 100 in comparison with the permeability of La2NiO4±δ and La2NiO4±δ+40% Ag composite. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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