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Phase Stability of 10mol%Sc2O3-1mol%CeO2-ZrO2 Ceramics

Published online by Cambridge University Press:  01 February 2011

Sergey Yarmolenko ,
Svitlana Fialkova ,
Devdas M. Pai  and
Jag Sankar
Sergey Yarmolenko
Affiliation:
[email protected], North Carolina A&T State University, Center for Advanced Materials and Smart Structures, 1601 E. Market St., 242 IRC, Greensboro, NC, 27411, United States
Svitlana Fialkova
Affiliation:
[email protected], North Carolina A&T State University, Mechanical Engineering, 1601 E. Market St., 242 IRC, Greensboro, NC, 27411, United States
Devdas M. Pai
Affiliation:
[email protected], North Carolina A&T State University, Mechanical Engineering, 1601 E. Market St., 242 IRC, Greensboro, NC, 27411, United States
Jag Sankar
Affiliation:
[email protected], North Carolina A&T State University, Mechanical Engineering, 1601 E. Market St., 242 IRC, Greensboro, NC, 27411, United States
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Abstract

Scandia-doped zirconia is a very promising material for solid oxide fuel cells due to its high oxygen conductivity in the 700-850°C temperature range. 10 mol% Sc2O3 - 1 mol% CeO2 - ZrO2 ceramics were sintered at temperatures 1100-1600°C using different heating rates and dwell times. Ceramics sintered at temperatures higher 1300°C were found to exist in cubic phase at room temperature and exhibit slow phase transformation from cubic (c) to rhombohedral (beta) phase between 330 and 400°C. Analysis of c-β phase transition efficiency in the ceramics shows a strong correlation between the transition rate and sintering temperature. Kinetics of phase transitions were studied by high temperature X-ray diffractometry (HTXRD) and differential scanning calorimetry methods. The reversible c-β phase transition was found to have very wide hysteresis (45-70°C), which depends on sintering temperature and density. Coefficients of thermal expansion of c- and β-phases were calculated from temperature dependence of lattice parameters obtained by HTXRD in the temperature range of 25-800°C. Microstructural changes on the surface of the cubic phase due to c-β phase transition studied by SEM and AFM.

Keywords

phase transformationkineticsceramic
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1074: Symposium I – Synthesis and Metrology of Nanoscale Oxides and Thin Films , 2008 , 1074-I03-66
Copyright
Copyright © Materials Research Society 2008

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References

REFERENCES

1. Kharton, V. V., Marques, F. M. B. Atkinson, A., Solid State Ionics (2003), 174 (1-4), pp. 135–149.Google Scholar
2. Badwal, S.P.S. Ciacchi, S.F., Rajendran, S., and Drennan, J., Solid State Ionics (1998), 109(3,4), pp. 167–186.Google Scholar
3. Yamamoto, O., Arachi, Y., Takeda, Y., Imanishi, N., Mizutani, Y., Kawai, M., and Nakamura, Y., Solid State Ionics (1995), 79, pp. 137–142.Google Scholar
4. Haering, C., Roosen, A., Schichl, H., and Schnoeller, M., Solid State Ionics (2005), 176(3-4), pp. 261–268.Google Scholar
5. Yashima, M., Kakihana, T., and Yoshimura, M., Solid State Ionics (1996), 86-88(2), pp. 1131–1149.Google Scholar
6. Fujimori, H., Yashima, M., Kakihana, M., Yoshimura, M., J. Appl. Phys. (2002), 91(10, Pt.1), pp. 6493–6498.Google Scholar
7. Lee, D.-S., Kim, W.S., Choi, S.H., Kim, J., Lee, H.W., and Lee, J.-H., Solid State Ionics (2005), 176(9-10), pp. 33–39.Google Scholar
8. Wang, Z., Cheng, M., Bi, Z., Dong, Y., Zhang, H., Zhang, J., Feng, Z., and Li, C., Materials Letters (2005), 59(19-20), pp. 2579–2582.Google Scholar
9. Yarmolenko, S., Sankar, J., Bernier, N., Klimov, M., Kapat, J., Orlovskaya, N., Journal of Fuel Cell Science and Technology, 2008 (accepted for publication, paper #FC-07-1075)Google Scholar
10. Yarmolenko, S., Ray, D., Pai, D.M., Sankar, J., Ceramic Engineering and Science Proceedings (2008), 28 (4), 345–360.Google Scholar