钴掺杂锡酸锶(SrSnO_3)陶瓷的制备与微结构表征研究  

Preparation and Microstructure of Co-Doped SrSnO_3 Ceramics via Solid State Reaction

作　　者：余昌江[1] 余爱民[1] 张勇[1] 虎学梅 高相东[2] 李效民[2] 

机构地区：[1]杭州诺贝尔集团有限公司,杭州311100 [2]中国科学院上海硅酸盐研究所高性能陶瓷和超微结构国家重点实验室,上海200050

出　　处：《中国陶瓷》2017年第2期43-48,共6页China Ceramics

摘　　要：采用自蔓延燃烧合成结合高温固相反应法制备了Co掺杂SrSnO_3陶瓷粉体及薄片,以XRD、SEM、TEM、EDS、UPS等手段表征了其晶体结构、微观化学组成、形貌及能带结构,系统考察了Co掺量、煅烧温度对结晶性的影响。结果表明,SrSnO_3陶瓷在Co掺量为0.5、煅烧温度1250℃时具有较高结晶质量及相纯度。陶瓷由具有规则几何外形的单晶颗粒(500 mm^2μm)及不规则多孔多晶颗粒(5~10μm,一次晶粒尺寸100~200 mm)共同构成,高温煅烧过程中元素Co、Sr的挥发可能是多孔多晶颗粒形成的主要原因。紫外光电子能谱测试表明,Co掺量为0.5的SrSnO_3陶瓷价带位置为1.03eV,功函数为2.997eV。Co-doped SrSnO3 ceramic powders and sheets were prepared via the self-propagating and high temperature solid state reaction method. The crystal structure, micro chemical composition, morphology and band structure were investigated by XRD, SEM, TEM, EDS and UPS. Effects of the Co doping content and the sintering temperature on the crystallinity were examined in detail. Results showed that the SrSnO3 ceramics exhibited higher crystallinity and better phase purity at Co doping content of 0.5 and sintering temperature of 1250℃. Two types of morphologies that the single crystal particle with regular geometric shape （500 nm- 2 μm）, and the irregular porous and polycrystalline particles （in size of 5- 10 μm, with the primary crystaUite size of 100- 200 nm） were observed from SEM and TEM analysis. EDS analysis showed the loss of element Sr and Co was possibly related to their volatilization during the high temperature sintering process, resulted in the formation of porous and polycrystalline particles. UPS analysis indicated that the valence band of SrSnO3 ceramics doped with 0.5 Co was 1.03 eV and the work function was 2.997 eV.

关 键 词：锡酸锶 掺杂 陶瓷 结晶性 能带结构 

分 类 号：TQ174.756[化学工程—陶瓷工业]