Ceramic oxide electrolytes based on Ca0.95 Mg0.05 Zr0.98O3 for solid galvanic cells application

• Autorzy: Dudek M. , Dudek P.
• Języki publikacji: EN

Abstrakty

EN

The Ca0.95Mg0.05ZrO3 nanopowder was successfully synthesized by the citrate method. The XRD diffraction method evaluated that the orthorombic CaZrO3 phase was detected in powders or sintered samples. The sintered sample at 1450oC for 2 hours exhibits about 98 % of theoretical density. The electrical conductivity was measured by a.c impedance spectroscopy method in the temperature range of 200-800oC. The transference oxygen ion number of CaZrO3 sample was estimated from electromotive force measurements (Em) of galvanic cell in the temperature range of 550-1100oC. The Ca0.95Mg0.05ZrO3 exhibits purely oxygen ion conductivity. It was successfully applied as a solid electrolyte in the electrochemical oxygen sensor operating at 660oC. The measured electromotive force of investigated cell was found to be linear with the logarithm of oxygen partial pressure in the range of 10-6 atm 1 atm and in the temperature range of 660-1000oC.

Słowa kluczowe

EN

ceramic oxide electrolyte; electrochemical oxygen gas sensor; impedance spectroscopy

• Wydawca: Politechnika Gdańska
• Czasopismo: Advances in Materials Science
• Rocznik: 2011
• Tom: Vol. 11, nr 3(29)
• Strony: 5--12
• Opis fizyczny: Bibliogr. 8 poz., rys.

Twórcy

autor

Dudek M.

autor

Dudek P.

• AGH –University of Science and Technology, Faculty of Fuels and Energy, Kawiory 40, 30-059 Cracow, Poland,

Bibliografia

• 1. D. Fray, The use of solid electrolytes as sensors in molten metals application, Solid State Ionics 86-88 (1996) 1045.
• 2. R.V. Kumar, D.Fray, Application of novel sensor in the measurement in very low oxygen potential, Solid State Ionics 70-71 (1994) 588-594.
• 3. D. Janke, W.A. Fischer: „Parameters pe of partial electronic conductivity in ZrO2 (CaO) and ThO2 (Y2O3) solid electrolytes between 1200 and 1650°C.” Archiv fur das Eisenhuttenwesen 45 (1975) 477-482.
• 4. D. Janke, Oxygen probes based on calcia-doped hafnia, or calcium zirconate for use in metallic melts, Metallurgical Transaction B (1982) 1992 (8) 227-235.
• 5. K.T. Jacob, K.T. Waseda, Gibbs free energy of formation of orthorombic CaZrO3 Termochimica Acta 239, (1994) 233-241.
• 6. Weyl, S. Wei, D. Janke: „Sensor based on new oxide electrolyte and oxygen reference materials for on –line measurements in steel melts”. Steel research 65 (1994) 167-172.
• 7. W. Fischer, D. Janke: „Calcium zirconate as solid electrolytes at temperatures around 1600°C ”. Archiv fur Eisenhuttenwesen 47 (1976) 525-530.
• 8. M. Dudek M. Bućko Electrical properties of stoichiometric and nonstoichiometric CaZrO3 Solid State Ionics 157 (1-4) 2003 183-187.