Effects of strontium gallate additions on sintering behavior and electrical conductivity of samaria-doped ceria

• Published in: Journal of alloys and compounds 2009-04, Vol.474 (1), p.219-222
• Main Authors: Lee, Joo-Sin, Choi, Kwang-Hoon, Park, Min-Woo, Choi, Yong-Gyu, Mun, Ji-Hun
• Format: Article
• Language: English
• Subjects: Ceramics; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Electronic transport in condensed matter; Exact sciences and technology; Ionic conduction; Mixed conductivity and conductivity transitions; Physics; Sintering
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2008.06.058

The densification behavior and electrical conductivity of Ce 0.8Sm 0.2O 1.9 ceramics were investigated with the strontium gallate concentration ranging from 0 to 5 mol%. The sintered density was found to increase rapidly up to 0.5 mol% Sr 2Ga 2O 5, and then to decrease with further additions. Dense Ce 0.8Sm 0.2O 1.9 ceramics with 97% of the theoretical density could be obtained for 0.5 mol% Sr 2Ga 2O 5-added specimen sintered at 1250 °C for 5 h, whereas pure Ce 0.8Sm 0.2O 1.9 ceramics needed to be sintered at 1550 °C in order to obtain an equivalent theoretical density. Electrical conductivity was measured as a function of dopant content, over the temperature range of 350–550 °C in air. Total conductivity of 0.5 mol% Sr 2Ga 2O 5-added specimen showed the maximum conductivity of 1.91 × 10 −2 Ω −1 cm −1 at 500 °C. The addition of strontium gallate was found to promote the sintering properties and electrical conductivities of Sm 2O 3-doped CeO 2.