IDENTIFICATION OF SECOND PHASE DEPOSITED ON La-DOPED SrTiO3 PEROVSKITES SYNTHESIZED BY CITRIC-GEL METHOD

T. Moriga; X. Liu; R. Minakata; R. Minato; K. Nakata; K. Murai; S. J. Shih; M. Mori

T. Moriga Department of Chemical Science and Technology, Graduate School of Advanced Technology and Science, Tokushima University, 2-1 Minami-Josanjima, Tokushima 770-8506, Japan
X. Liu Department of Chemical Science and Technology, Graduate School of Advanced Technology and Science, Tokushima University, 2-1 Minami-Josanjima, Tokushima 770-8506, Japan
R. Minakata Department of Chemical Science and Technology, Graduate School of Advanced Technology and Science, Tokushima University, 2-1 Minami-Josanjima, Tokushima 770-8506, Japan
R. Minato Department of Chemical Science and Technology, Graduate School of Advanced Technology and Science, Tokushima University, 2-1 Minami-Josanjima, Tokushima 770-8506, Japan
K. Nakata Department of Chemical Science and Technology, Graduate School of Advanced Technology and Science, Tokushima University, 2-1 Minami-Josanjima, Tokushima 770-8506, Japan
K. Murai Department of Chemical Science and Technology, Graduate School of Advanced Technology and Science, Tokushima University, 2-1 Minami-Josanjima, Tokushima 770-8506, Japan
S. J. Shih Department of Materials Science and Engineering, National Taiwan University of Science and Technology, 43, Sec. 4 Keelung Rd, Taipei City 10607, Taiwan.
M. Mori Central Research Institute of Electric and Power Industry, Yokosuka, Kanagawa 240-0196, Japan

Abstract

We examined deposition process of the second phase during sintering Sr_0.7La_0.3TiO₃perovskite at 1400°C and analyzed the detailed composition by means of SEM-EDX technique. The second phase deposited at the corners of the Sr_0.7La_0.3TiO₃matrix grains was confirmed to be Sr-doped rare-earth B-type La₂O₃.

Downloads

Download data is not yet available.

References

H. Tsukuda, S. Okuma and K. Tomida, "Influence of La Substitution on Sintering Behavior, Electronic Properties and Thermal Expansion of Sr1-xLaxTiO3," Journal of the Japan Society of Powder and Powder Metallurgy, vol. 56, no. 2, pp. 65-70, 2009.

B.K. Park, J.W. Lee, S.B. Lee, T.H.Lim, S.J. Park, R.H. Song, W.B. Im and D.R. Shin, “La-doped SrTiO3 interconnect materials for anode-supported flat-tubular solid oxide fuel cell,” International Journal of Hydrogen Energy, vol. 37, no. 5, pp. 4319-4327, 2012.

X. Zhou, N. Yan, K.T. Chuang and J. Luo, “Progress in La-doped SrTiO3 (LST)-based anode materials for solid oxide fuel cells,” RSC Advances, vol. 4, no. 1, pp. 118-131, 2014.

K. Tomida, A. Yamashita, H. Tsukuda, T. Kabata, K. Ikeda, N. Hisatome and Y. Yamasaki, "Optimization of Segmented-in-series Tubular SOFCs with an (La, Sr) CoO3 System Cathode and the Generation Characteristics under Pressurization," Electrochemistry, vol. 77, no. 12, pp. 1018-1027, 2009.

N.H. Chan, R. Sharma and D. M. Smith, "Nonstoichiometry in SrTiO3," Journal of the Electrochemical Society, vol. 128, no. 8, pp. 1762-1769, 1981.

Z. Wang and M. Mori, "Sintering Characteristics and Electrical Conductivity of (Sr1-xLax)TiO3 Synthesized by the Citric Acid Method," Journal of Fuel Cell Science and Technology, vol. 8, no. 5, pp. 051018/1-051018/5, 2011.

M. Mori, K. Nakamura and T. Itoh, "Crystal Structure and Anomalous Sintering Behavior of (Sr0.7La0.3)1-xTiO3+d Provskites Synthesized by the Pethini Method," Journal of Fuel Cell Science and Technology, vol. 9, no. 2, pp. 021007/1-021007/8, 2012.

R. Meyer, R. Waser, J. Helmbold and G. Borchardt, "Cationic Surface Segregation in Donor-Doped SrTiO3 Under Oxidizing Conditions," Journal of Electroceramics, vol. 9, no. 2, pp. 101-110, 2002.

L. Guam, M. Li, X. Li, L. Feng, F. Teng, B. Liu, Z. Wei, C. B. Musgrave, “Electronic and dielectric properties of Ruddlesden-Popper type and Magneli type SrTiO3,” Computational Materials Science, vol. 96, pp. 223-228, 2015.

H. Wei, L. Beuermann, J. Helmbold, G. Borchardt, V. Kempter, G. Lilienkamp and W. Maus-Friedrichs, "Study of SrO Segregation on SrTiO3(100) Surfaces," Journal of the European Ceramic Society, vol. 21, no. 10-11, pp. 1677-1680, 2001.

M. Fujikawa, Y. Higashi, Y. Nomura, T. Ueki, S. Sugano, K. Murai, T. Moriga and M. Mori, "Identification of Second Phases for Sr1-xLaxTiO3 Perovskites Synthesized by Citric-Gel Method," ECS Transactions, vol. 57, no. 1, pp. 2331-2337, 2013.

T. Moriga, S. Yabui, Y. Higashi, K. Murai, Z.-W. Wang and M. Mori, "A-site Deficiency and Structural and Electrical Characteristics of (Sr1-xREx)1-yTiO3 Provskites (RE=La, Nd and Sm)," International Journal of Modern Physics: Conference Series, vol. 6, pp. 85-90, 2012.

R. D. Shannon, "Revised Effective Ionic Radii and Systematic Studies of Interatomic Distances in Halides and Chalcogenides," Acta Crystallographica Section A: Crystal Physics, Diffraction, Theoretical and General Crystallography, vol. 32, no. 5, pp. 751-767, 1976.

H.S. Potdar, S.B. Deshpande, P.D. Godbole, V.G. Gunjikar and S.K. Date, “Low temperature synthesis of ultrafine strontium titanate (SrTiO3) powders,” Journal of Materials Research, vol. 7, no. 2, pp. 429-434, 1992.

F. Voigts, T. Damjanovic, G. Borchardt, C. Argirusis and W. Maus-Friedrichs, “Synthesis and Characterization of Strontium Titanate Nanoparticles as Potential High Temperature Oxygen Sensor Material,” Journal of Nanomaterials, vol. 2006, pp. 1-6, 2006.