复合掺杂对YSZ电解质材料烧结性与电性能的影响  

Effect of Complex Additives on Sinterability and Conductivity of YSZ Electrolytes

作　　者：吕振刚[1] 郭瑞松[1] 姚琲[1] 代凤英[1] 

机构地区：[1]天津大学先进陶瓷与加工技术教育部重点实验室,天津300072

出　　处：《稀有金属材料与工程》2005年第12期1961-1964,共4页Rare Metal Materials and Engineering

基　　金：863资助项目(2001AA323090和2002AA517013)

摘　　要：采用高温固溶法制备Sc_2O_3(Dy_2O_3)和Yb_2O_3复合掺杂YSZ电解质材料,研究了复合掺杂对YSZ烧结性和电性能的影响。结果表明：随着Sc_2O_3含量的增加,试样烧结密度降低(1600℃烧结密度由5．82g／cm^3降至5．24 g／cm^3),而Dy_2O_3却能提高烧结密度(1600℃烧结密度由5．63 g／cm^3增至5．86 g／cm^3)；当掺杂总量(x,％)为8～8．6时,材料电导率得到大幅度提高(1000℃时,0.18 S／cm)；lnσ-1000／T呈现较好的线性关系,说明电导率σ与温度T之间关系符合Arrhenius公式：XRD分析表明复合掺杂YSZ电解质材料晶格常数有所增大,对提高电导率起积极作用：复合添加剂促进了晶粒生长,尤其是含Dy试样晶粒尺寸较大。YSZ electrolyte materials doped by Sc2O3 （Dy2O3） and Yb2O3 were prepared by high-temperature solid-state method, and its sinterability and conductivity were studied. The results indicate that the sintering density decrease from 5.82 g/cm^3 to 5.24 g/cm^3 with the increase of the content of Sc203 when sintering at 1600℃ for 4 h, but it increase from 5.63 g/cm^3 to 5.86 g/cm^3 as the content of Dy2O3 increase under the same conditions. Conductivity are enhanced remarkably, reaching to 0.18 S/cm at 1000℃, with the total additives in the range of 8 mo1%-8.6 mol%. For all samples, the relation between lnσ and 1000/T are basically linear, which shows the relation between conductivity （σ） and temperature （T） fit to Arrhenius formula. All samples have the cubic structure and crystal lattice constant increased a little as demonstrated by the shift of main peaks of XRD patterns towards smaller angles. The complex additives promote grain growth of ZrO2. The sample with Dy has a larger grain size than that with Yb and/or Sc,

关 键 词：固体电解质 导电性 烧结性 复合掺杂剂 

分 类 号：O611.4[理学—无机化学]