Qing XU
,
Wen CHEN
,
Duanping HUANG
,
Runzhang YUAN
材料科学技术（英文）
Doped SrTiO3 capacitor-varistor multifunctional ceramics were fabricated by a single sintering process. AC complex impedance analysis was performed to investigate electrical features of grains and grain boundaries for both as-reduced ceramic and reoxidized ceramics.The results showed that the as-reduced ceramic exhibited inductive response at high frequencies above 2 MHz, which is attributed to the contribution of electron behavior in semiconducting grains.The high frequency inductive response disappeared in impedance plots of reoxidized ceramics.
关键词:
Strontium titanate
,
null
,
null
,
null
沈帅
,
贾玉帅
,
范峰滔
,
冯兆池
,
李灿
催化学报
doi:10.1016/S1872-2067(12)60702-5
使用时间分辨红外光谱研究了经H2和O2处理的La和Cr共掺杂SrTiO3的光生电子动力学.X射线光电子能谱和Raman光谱结果表明,H2处理后样品中的Cr均是+3价,而O2处理后Cr为+3和+6价.使用355和532 nm激光激发样品所得时间分辨红外光谱表明,相比在cr6+存在时,光生电子衰减速率在Cr3+存在的情况下要慢,这说明Cr3+更有利于抑制光生电子空穴的复合,从而增加光催化产氢的活性.
关键词:
时间分辨光谱
,
铬掺杂
,
钛酸锶
,
光催化
