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Research Papers

A-Site and B-Site Non-stoichiometry and Sintering Characteristics of (Sr1−x Lax )1−y Ti1−z O3 Perovskites

[+] Author and Article Information
Masashi Mori1

 Central Research Institute of Electric Power Industry, 2-6-1 Nagasaka, Yokosuka, Kanagawa 240-0196, Japanmasashi@cripei.denken.or.jp

Zhenwei Wang

 Central Research Institute of Electric Power Industry, 2-6-1 Nagasaka, Yokosuka, Kanagawa 240-0196, Japan

Takanori Itoh

 AGC Seimi Chem. Co. Ltd., 3-2-10 Chigasaki, Chigasaki-shi, Kanagawa 253-8585, Japan

Shintarou Yabui, Kei-ichiro Murai, Toshihiro Moriga

 Tokushima University, 2-1 Minami-josanjima, Tokushima-shi, Tokusima 770-8506, Japan

1

Corresponding Author.

J. Fuel Cell Sci. Technol 8(5), 051014 (Jun 23, 2011) (4 pages) doi:10.1115/1.4003982 History: Received December 28, 2010; Revised April 05, 2011; Published June 23, 2011; Online June 23, 2011

The A-Site and B-Site non-stoichiometry and sintering characteristics of (Sr1− x Lax )1− y Ti1− z O3 perovskites were studied using samples prepared by solid-state mixing. A-Site or B-Site deficiency was observed for La-doped SrTiO3 perovskites, and this increased with increasing La content. For A-Site deficient (Sr1 − x Lax )1 − y TiO3 perovskites, the cell volumes decreased although the reverse was observed for B-Site deficient (Sr1 − x Lax )Ti1 − z O3 perovskites. This may be related to number of B-Site vacancies in the perovskites through charge compensation. It was found that A-Site and B-Site deficiencies increase the density of (Sr1 − x Lax )1 − y Ti1 − z O3 perovskites. These characteristics may prove useful in the development of solid oxide fuel cell interconnect materials.

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Figures

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Figure 1

Lattice parameters of Srx TiO3 after firing at 1400°C for 10 h

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Figure 2

Relative density of A-Site deficient and excess Srx TiO3 perovskites after firing at 1300°C

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Figure 3

XRD patterns (2θ = 20–40°) of A-Site deficient (Sr0.9 La0.1 )1− y TiO3 perovskites after firing at 1500°C for 5 h: (a) y = 0, (b) y = 0.05, (c) y = 0.1. The symbols (×) represent the second phase (TiO2 ).

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Figure 4

XRD patterns (2θ = 20–40°) of B-Site deficient (Sr0.9 La0.1 )Ti1− z O3 perovskites after firing at 1500°C for 5 h: (a) z = 0.02, (b) z = 0.04, (c) z = 0.06. The symbol (∇) represent the second phase (Sr2 TiO4 ).

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Figure 5

Cell volumes of the (Sr1− x Lax )1− y TiO3 perovskite samples, with the open and closed symbols representing a single phase and two phases of the (Sr1−x Lax )1−y TiO3 samples, respectively

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Figure 6

Cell volumes of the (Sr1− x Lax )Ti1− z O3 perovskite samples, with the open and closed symbols representing single phase and two phases of the (Sr1− x Lax )Ti1− z O3 samples, respectively

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Figure 7

Relative densities of the (Sr1− x Lax )1− y TiO3 perovskites after firing at 1600°C for 5 h as a function of A-Site deficiency. The closed symbols represent samples with two phases.

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Figure 8

Relative densities of the (Sr1− x Lax )Ti1− z O3 perovskites after firing at 1600°C for 5 h as a function of B-Site deficiency. The closed symbols represent samples with two phases.

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Figure 9

Surface-sectional SEM micrographs of (a) (Sr0.9 La0.1 )TiO3 , (b) (Sr0.9 La0.1 )0.95 TiO3, and (c) (Sr0.9 La0.1 )Ti0.98 O3 after firing at 1600°C for 5 h

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Figure 10

Cross-sectional SEM micrographs of (a) (Sr0.9 La0.1 )TiO3 , (b) (Sr0.9 La0.1 )0.95 TiO3, and (c) (Sr0.9 La0.1 )Ti0.98 O3 after firing at 1600°C for 5 h

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