CONTENTS Doped Barium Zirconate Applications, advantages & disadvantages of BZY Sintering Sample Preparation Characte...
BARIUM ZIRCONATEPervoskite structure When Barium Zirconate (BZ) is doped with Y2O3, oxygen vacancies are formed.         ...
APPLICATIONS OF BZY It is used as electrolyte and electrode material in  Intermediate Temperature Solid Oxide Fuel Cell  ...
ADVANTAGES OF BZY High stability with sufficient proton conductivity in  the temperature range of 600-800o C Greatly red...
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 s...
SINTERING Various atomic mechanisms: 1. Evaporation – Condensation (path 1) 2. Surface diffusion (path 2) 3. Volume diffu...
SINTERING STAGES An interval of geometric change in which pore shape is totally defined  (such as rounding of necks durin...
SAMPLE PREPARATION Solid-state method Raw materials: BaCO3 , ZrO2 , Y2O3 Weighing and mixing/grinding Calcination Pel...
CHARACTERIZATION Phase formation Density Sintering Microstructural studies
RESULTS & DISCUSSIONS                 1. XRD                  200                                                1300     ...
RESULTS & DISCUSSIONS 2. PARTICLE MORPHOLOGY & PARTICLE SIZE DISTRIBUTION Shape not exactly spherical Paricle size varie...
RESULTS & DISCUSSIONS                                        3. SINTERING Dilatometry                                    ...
RESULTS & DISCUSSIONS                          3.SINTERING Densification Low density Grain size was 200 – 500 nm Singl...
RESULTS & DISCUSSIONS           4. DENSIFICATION USING ZnOBy using ZnO, 92 – 94 % density was obtained.
CONCLUSION Single phase formation BZY couldn’t be sintered properly even at 1550o C ZnO helps in sintering
THANK YOU!!!
Barium zirconate
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Barium zirconate

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powder synthesis and sintering studies of yttria doped barium zirconate

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Barium zirconate

  1. 1. CONTENTS Doped Barium Zirconate Applications, advantages & disadvantages of BZY Sintering Sample Preparation Characterization Results and Discussion Conclusion
  2. 2. BARIUM ZIRCONATEPervoskite structure When Barium Zirconate (BZ) is doped with Y2O3, oxygen vacancies are formed. Y2O3 + BaZrO3 2YZr’ + 3Oox + Vooo
  3. 3. APPLICATIONS OF BZY It is used as electrolyte and electrode material in Intermediate Temperature Solid Oxide Fuel Cell (IT-SOFC).
  4. 4. 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
  5. 5. DISADVANTAGES OF BZY Yttria doped barium zirconate material is difficult to sinter
  6. 6. SINTERING Sintering simply means “coalescence of powder at elevated temperatures.” The driving force operating during sintering is the reduction in surface energy.
  7. 7. SINTERING Various atomic mechanisms: 1. Evaporation – Condensation (path 1) 2. Surface diffusion (path 2) 3. Volume diffusion (path 3) 4. Grain boundary diffusion (path 4)
  8. 8. 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
  9. 9. SAMPLE PREPARATION Solid-state method Raw materials: BaCO3 , ZrO2 , Y2O3 Weighing and mixing/grinding Calcination Pelletization (uniaxial and cold isostatic pressing) Solid state sintering
  10. 10. CHARACTERIZATION Phase formation Density Sintering Microstructural studies
  11. 11. RESULTS & DISCUSSIONS 1. XRD 200 1300 1350 1400 150Intensity (A.U) 100 50 0 20 30 40 50 60 2
  12. 12. RESULTS & DISCUSSIONS 2. PARTICLE MORPHOLOGY & PARTICLE SIZE DISTRIBUTION Shape not exactly spherical Paricle size varied from 0.205 µm to 1.405 µm Average particle size 0.649 µm
  13. 13. RESULTS & DISCUSSIONS 3. SINTERING Dilatometry Temperature Vs Shrinkage 0 Shrimkage (in %) -2 -4 -6 0 700 1400 O Temperature (in C) maximum shrinkage was 5.36 % at 1556o C
  14. 14. RESULTS & DISCUSSIONS 3.SINTERING Densification Low density Grain size was 200 – 500 nm Single phase formation had taken place
  15. 15. RESULTS & DISCUSSIONS 4. DENSIFICATION USING ZnOBy using ZnO, 92 – 94 % density was obtained.
  16. 16. CONCLUSION Single phase formation BZY couldn’t be sintered properly even at 1550o C ZnO helps in sintering
  17. 17. THANK YOU!!!
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