Journal Article

FZJ-2014-01378

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png In situ X-ray diffraction studies of Pr2 − xNiO4 + δ crystal structure relaxation caused by oxygen loss

Sadykov, S. ; , O. Y. ; Yeremeev, N. ; Vinokurov, Z. ; Shmakov, A. ; Belyaev, V. ; Uvarov, N. ; Mertens, J.FZJ*

2014
Elsevier Science Amsterdam [u.a.]

This record in other databases:    

Please use a persistent id in citations: doi:10.1016/j.ssi.2014.02.001

Abstract: Fine powders of Pr2 − xNiO4 + δ (PNO) oxides (x=0÷0.3) synthesized by Pechini routewere uniaxially pressedinto pellets and sintered at 1300 °C under air. Chemical diffusion coefficients (Dchem.) and surface exchange constants(kchem.) were estimated by analysis of the weight and conductivity relaxations after step-wise change ofpO2. In situ XRD studies were carried out in VEPP-3 facilities of the Siberian Center of Synchrotron Radiationusing unique high-temperature camera and procedures.Analysis of dynamics of the cell volume expansion caused by oxygen loss with due regard for penetration depthof X-rays into the pellet allowed to estimate Dchem and kchem found to be close to those obtained by traditionalmethods. Isolated Pr vacancies appear to be the most important for fast oxygen diffusion and high surface reactivityproviding the highest values of kchem and Dchem for Pr1.9NiO4 + δ composition.

---

Contributing Institute(s):

1. Grundlagen der Elektrochemie (IEK-9)

Research Program(s):

1. 123 - Fuel Cells (POF2-123) (POF2-123)
2. 152 - Renewable Energies (POF2-152) (POF2-152)

Appears in the scientific report 2014

---

Database coverage:
Current Contents - Social and Behavioral Sciences ; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

---