Synthesis and Thermal Properties of Ca_(3-x)La_xCo_4O_9 Ceramics  

作　　者：张艳峰 张久兴 路清梅 张庆云 

机构地区：[1]The key Laboratory of Advanced Functional Materials of Education Ministry, Beijing University of Technology, Beijing 100022, China,College of Chemistry, Hebei Normal University, Shijiazhuang 050016, China [2]The key Laboratory of Advanced Functional Materials of Education Ministry, Beijing University of Technology, Beijing 100022, China

出　　处：《Journal of Rare Earths》2005年第S1期160-163,共4页稀土学报（英文版）

基　　金：ProjectsupportedbytheNationalNaturalScienceFoundationofChinaUnderGranted(50271001)andBeijingMunicipalEducationCommissionUnderContract(KZ200310005001)

摘　　要：Preparation of homogeneous Ca_ 3-xLa_xCo_4O_9 (x=0～0.4) single-phase ceramic powders was described using a tartrate complex method. The results show Ca3Co_4O_9 phase can be obtained by calcining the dry gel at 750 ℃ for 5 h. The Ca_ 3-xLa_xCo_4O_9 ceramics have been prepared by spark plasma sintering at 800 ℃ for 5 min. Spark plasma sintering process is effective in synthesis of Ca_ 3-xLa_xCo_4O_9 compact ceramics. The thermal conductivity of Ca_ 3-xLa_xCo_4O_9 bulks was investigated from room temperature to 700 ℃. The results show that Ca_ 2.7La_ 0.3Co_4O_9 has lowest thermal conductivity due to the increasing of phonon scattering by La substitution.Preparation of homogeneous Ca_ 3-xLa_xCo_4O_9 (x=0～0.4) single-phase ceramic powders was described using a tartrate complex method. The results show Ca3Co_4O_9 phase can be obtained by calcining the dry gel at 750 ℃ for 5 h. The Ca_ 3-xLa_xCo_4O_9 ceramics have been prepared by spark plasma sintering at 800 ℃ for 5 min. Spark plasma sintering process is effective in synthesis of Ca_ 3-xLa_xCo_4O_9 compact ceramics. The thermal conductivity of Ca_ 3-xLa_xCo_4O_9 bulks was investigated from room temperature to 700 ℃. The results show that Ca_ 2.7La_ 0.3Co_4O_9 has lowest thermal conductivity due to the increasing of phonon scattering by La substitution.

关 键 词：SOL-GEL Ca_ 3-xLa_xCo_4O_9 thermal conductivity 

分 类 号：TQ174.1[化学工程—陶瓷工业]