CONTENTS Doped Barium Zirconate Applications, advantages & disadvantages of BZY Sintering Sample Preparation Characterization Results and Discussion Conclusion
BARIUM ZIRCONATEPervoskite structure When Barium Zirconate (BZ) is doped with Y2O3, oxygen vacancies are formed. Y2O3 + BaZrO3 2YZr’ + 3Oox + Vooo
APPLICATIONS OF BZY It is used as electrolyte and electrode material in Intermediate Temperature Solid Oxide Fuel Cell (IT-SOFC).
ADVANTAGES OF BZY High stability with sufficient proton conductivity in the temperature range of 600-800o C Greatly reduces material & fabrication problems Improves cell reliability during prolonged operations Stable in CO2 and H2O containing atmosphere
DISADVANTAGES OF BZY Yttria doped barium zirconate material is difficult to sinter
SINTERING Sintering simply means “coalescence of powder at elevated temperatures.” The driving force operating during sintering is the reduction in surface energy.
SINTERING STAGES An interval of geometric change in which pore shape is totally defined (such as rounding of necks during the initial stage sintering) or an interval of time during which the pore remains constant in shape while decreasing in size
SAMPLE PREPARATION Solid-state method Raw materials: BaCO3 , ZrO2 , Y2O3 Weighing and mixing/grinding Calcination Pelletization (uniaxial and cold isostatic pressing) Solid state sintering