Preparation and Properties of (YCa)(TiMn)O3-d Ceramics Interconnect of Solid Oxide Fuel Cells

Yi-Cheng Liou; Wen-Chou Tsai; Hao-Hsuan Yen; Yung-Chia Chang

doi:10.3390/ma8074239

Preparation and Properties of (YCa)(TiMn)O_3-_d Ceramics Interconnect of Solid Oxide Fuel Cells

Materials (Basel). 2015 Jul 10;8(7):4239-4248. doi: 10.3390/ma8074239.

Authors

Yi-Cheng Liou^{1

2}, Wen-Chou Tsai^{3

4}, Hao-Hsuan Yen⁵, Yung-Chia Chang⁶

Affiliations

¹ Department of Electronic Engineering, Kun Shan University, No.195, Kunda Rd., Yongkang Dist., Tainan City 71070, Taiwan. ycliou@mail.ksu.edu.tw.
² Nano Technology R&D Center, Kun Shan University, No.195, Kunda Rd., Yongkang Dist., Tainan City 71070, Taiwan. ycliou@mail.ksu.edu.tw.
³ Department of Electronic Engineering, Kun Shan University, No.195, Kunda Rd., Yongkang Dist., Tainan City 71070, Taiwan. wctsai@mail.ksu.edu.tw.
⁴ Nano Technology R&D Center, Kun Shan University, No.195, Kunda Rd., Yongkang Dist., Tainan City 71070, Taiwan. wctsai@mail.ksu.edu.tw.
⁵ Department of Electronic Engineering, Kun Shan University, No.195, Kunda Rd., Yongkang Dist., Tainan City 71070, Taiwan. s103001638@g.ksu.edu.tw.
⁶ Department of Electronic Engineering, Kun Shan University, No.195, Kunda Rd., Yongkang Dist., Tainan City 71070, Taiwan. a253591016@gmail.com.

Abstract

(YCa)(TiMn)O_3-_d ceramics prepared using a reaction-sintering process were investigated. Without any calcination involved, the mixture of raw materials was pressed and sintered directly. Y₂Ti₂O₇ instead of YTiO₃ formed when a mixture of Y₂O₃ and TiO₂ with Y/Ti ratio 1/1 were sintered in air. Y₂Ti₂O₇, YTiO_2.085 and some unknown phases were detected in Y_0.6Ca_0.4Ti_0.6Mn_0.4O_3-_d. Monophasic Y_0.6Ca_0.4Ti_0.4Mn_0.6O_3-_d ceramics were obtained after 1400-1500 °C sintering. Dense Y_0.6Ca_0.4Ti_0.4Mn_0.6O_3-_d with a density 4.69 g/cm³ was observed after 1500 °C/4 h sintering. Log σ for Y_0.6Ca_0.4Ti_0.6Mn_0.4O_3-_d increased from -3.73 Scm^-1 at 350 °C to -2.14 Scm^-1 at 700 °C. Log σ for Y_0.6Ca_0.4Ti_0.4Mn_0.6O_3-_d increased from -2.1 Scm^-1 at 350 °C to -1.36 Scm^-1 at 700 °C. Increasing Mn content decreased activation energy E_a and increased electrical conductivity. Reaction-sintering process is proved to be a simple and effective method to obtain (YCa)(TiMn)O_3-_d ceramics for interconnects in solid oxide fuel cells.

Keywords: (YCa)(TiMn)O3−d; interconnect; solid oxide fuel cells.