摘要
用改进方法合成了标题化合物。采用气相法通过固-气反应,研究多组分稀土对所合成多金属氧酸盐的化学热扩渗。经ICP、XPS、IR和XRD分析发现,微量的La、Ce、Sm、Gd等稀土元素可以渗入到多金属氧酸盐的体相。扩渗后化合物的电导率在室温下σ值达到1.59×10-3S·cm-1,比扩渗前多金属氧酸盐的电导率(σ=2.4×10-7S·cm-1)提高了几千倍;且渗后化合物导电性能的稳定温度显著增大,同导电性能最好的多金属氧酸盐H3PM12O40·29H2O(M=W,Mo)相比,其导电热稳定温度增大近200K,成为在523K以上依然保持高电导率的新型固体电解质。
Compound,α-K_7[SiFe_3(OH_2)_3W_9O_(37)], was synthesized by the modified method. The chemical-thermal co-permeation was carried out on the title compound with the rare earth salts through the gas-solid reaction. The permeated compound was characterized by ICP , IR, XRD and XPS, and the results indicate that the rare earth elements including La, Ce, Sm and Gd have permeated into α-K_7[SiFe_3(OH_2)_3W_9O_(37)]. The XPS results also give the evidence that there is the weak interaction existing between the rare earth elements and the polyoxometalate. The conductivity of the permeated compound is 1.59×10^(-3)S·cm^(-1) at the room temperature, which is 6.6×10~3 times higher than that of the compound α-K_7[SiFe_3(OH_2)_3W_9O_(37)]. Meanwhile the thermal stability of the conductivity is dramatically increased after the permeation, i.e. the thermal stability temperature is 200K higher than that of the H_3PM_(12)O_(40)·29H_2O(M=W,Mo).
出处
《稀土》
EI
CAS
CSCD
北大核心
2004年第4期17-21,共5页
Chinese Rare Earths
关键词
铁
多金属氧酸盐
稀土多元渗
导电性
iron
polyoxometalate
rare earth elements co-permeation
conductivity
