Detail publikace

Synthesis, structure and oxygen thermally programmed desorption spectra of La1-xCaxAlyFe1-yO3-d perovskites

CIHLÁŘ, J. DEL FAVERO, D. CIHLÁŘ, J. BUCHAL, A. VAN HERLE, J.

Originální název

Synthesis, structure and oxygen thermally programmed desorption spectra of La1-xCaxAlyFe1-yO3-d perovskites

Typ

článek v časopise - ostatní, Jost

Jazyk

angličtina

Originální abstrakt

Perovskites La1-xCaxAlyFe1-yO3-d (x, y = 0 to 1) were prepared by high-temperature solid-state synthesis based on mixtures of oxides produced by colloidal milling. The XRD analysis showed that perovskites La0.5Ca0.5AlyFe1-yO3-d with a high Fe content (1 - y = 0.8-1.0) were of orthorhombic structure, perovskites with a medium Fe content (1 - y = 0.8-0.5) were of rhombohedral structure, and perovskite with the lowest Fe content (1 - y = 0.2) were of cubic structure. Thermally programmed desorption (TPD) of oxygen revealed that chemical desorption of oxygen in the temperature range from 200 to 1000 degC had proceeded in the two desorption peaks. The low-temperature alfa-peak (in the 200-550 degC temperature range) was brought about by oxygen liberated from oxygen vacancies; the high-temperature beta-peak (in the 550-1000 degC temperature range) corresponded to the reduction of Fe4+ to Fe3+. The chemidesorption oxygen capacity increased with increasing Ca content and decreased with increasing Al content in the perovskites. The Al3+ ions restricted, probably for kinetic reasons, the reduction of Fe4+ and the high-temperature oxygen desorption associated with it.

Klíčová slova v angličtině

Perovskites; membranes; X-ray methods; powders-solid state reaction; chemisorption

Autoři

CIHLÁŘ, J.; DEL FAVERO, D.; CIHLÁŘ, J.; BUCHAL, A.; VAN HERLE, J.

Rok RIV

2006

Vydáno

1. 1. 2006

Nakladatel

Elsevier Science

ISSN

0955-2219

Periodikum

Journal of the European Ceramic Society

Ročník

26

Číslo

14

Stát

Spojené království Velké Británie a Severního Irska

Strany od

2999

Strany do

3004

Strany počet

6

URL

http://www.sciencedirect.com

BibTex

@article{BUT43557,
  author="Jaroslav {Cihlář} and David {Del Favero} and Jaroslav {Cihlář} and Antonín {Buchal} and Jan {Van herle}",
  title="Synthesis, structure and oxygen thermally programmed desorption spectra of La1-xCaxAlyFe1-yO3-d perovskites",
  journal="Journal of the European Ceramic Society",
  year="2006",
  volume="26",
  number="14",
  pages="2999--3004",
  issn="0955-2219",
  url="http://www.sciencedirect.com"
}