Crystal structure and oxygen nonstoichiometry of the third-order Ruddlesden-Popper phase Pr4(Ni0.9Co0.1)3O10-δ

Open Ceramics

Rotraut Merkle¹  Christian Berger²  Edith Bucher²  Werner Sitte³  Joachim Maier³ 

[1] Corresponding author. Chair of Physical Chemistry, Montanuniversitaet Leoben, Franz-Josef-Straße 18, 8700, Leoben, Austria.;Chair of Physical Chemistry, Montanuniversitaet Leoben, Franz-Josef-Straße 18, A-8700, Leoben, Austria;Max Planck Institute for Solid State Research, Heisenbergstraße 1, D-70569, Stuttgart, Germany;

关键词: Praseodymium nickelate;    Third-order Ruddlesden-Popper phase;    Crystal structure;    Defect chemistry;    Solid oxide fuel cell cathode;    Solid oxide electrolyser cell anode;   

DOI  :  

来源: DOAJ

【 摘 要 】

Crystal structure and thermal expansion of the third-order Ruddlesden-Popper phase Pr4Ni2.7Co0.3O10-δ (PNCO) were determined by high temperature X-ray powder diffraction (HT-XRD) and Rietveld analysis in the temperature range 25–600 ​°C in air. The thermal expansion coefficient (TEC) of PNCO is smaller compared with first-order Ruddlesden-Popper phases and in excellent agreement with values of common electrolytes of solid oxide cells. HT-XRD, thermogravimetry, and differential scanning calorimetry showed a reversible phase transition at 600–650 ​°C. A single monoclinic (P21/a) phase occurs at 25–600 ​°C, while a mixture of monoclinic and tetragonal (I4/mmm) phases is found at 650–900 ​°C. The oxygen nonstoichiometry was determined by thermogravimetry as a function of temperature (300 ​≤ ​T/°C ​≤ ​900) and oxygen partial pressure (8.3 ​× ​10−4 ​≤ ​pO2/bar ​≤ ​8.3 ​× ​10−1). Data of the oxygen nonstoichiometry were further evaluated with respect to the partial molar enthalpy and entropy of oxygen, and the thermodynamic factor of oxygen.

【 授权许可】

Unknown