Thermal ezpansion behavior and high-temperature transport properties of Sr3YCo4-zFezO10.5+y, z=0.0, 1.0, 2.0 and 3.0

摘要：

High-temperature X-ray diffraction revealed peculiarities of thermal expansion of Sr3YCo4O10.5 with tetragonal 314-structure such as anisotropy of the lattice expansion (thermal expansion coefficient of the α-parameter TECav(α)= 18.6 ppm K-1 TEC(c)=25.6 ppm K-1) and two intermediate regions with different TEC anisotropy: TEC(c)/TEC(α)=1.98 at 298-773 K and 0.96 at 773-1173 K. Replacement of Co by Fe in Sr3YCo4-xFexO10.5+y leads to decreasing of TEC at T < 673 K to 16.6 ppm K-1 for x= 1.0 and 14.6 ppm K-1 for x=3.0. At T>673 K increase of TEC up to ～20 ppm K-1 due to the oxygen loss from the crystal structure is observed. Sr3YCo4-xFexO10.5+y compounds show high electrical conductivity values at 1173 K up to ～200 S/cm for Sr3YCo4O10.5. A decrease in conductivity at high temperature is observed with increasing the Fe-content.

关键词： Thermal ezpansion High-temperature transport properties Perovskites 314-phases Cobaltites High-temperature X-ray diffraction

作者: S.Ya.Istomin O.A.Drozhzhin Ph.S.Napolsky S.N.Putilin A.A.Gippius E.V.Antipov

作者单位: Department of Chemistry, Moscow State University, 119992, Moscow, Russia Institute of Problems of Chemical Physics, RAS, 142432, Chernogolovka, Moscow region, Russia Department of Materials Science, 119992, Moscow, Russia Department of Physics, Moscow State University, 119992, Moscow, Russia

会议类型: 国际会议

会议名称: The 16th International Conference on Solid State Ionics(第十六届国际固态离子学会议)

会议地点: 上海

会议语种:英文

页码: 1054-1057

在线出版日期: 2007-07-01（万方平台首次上网日期，不代表论文的发表时间）