通过对LaCrO3和NiMn2O4及其复合材料的大量的稳定性试验考察，发现复合材料的稳定性显著优于单相材料．本文应用缺陷化学理论对单相材料老化过程中阻值变化的原因进行了分析，分析表明：老化过程中由于瓷体表面及气孔内吸附的氧逐渐扩散到体内，使氧空位浓度减小，从而使p型半导瓷LaCrO3阻值缓慢减小，而使n型半导瓷NiMn2O4的阻值缓慢增大，解释了复合材料优异的耐高温特性是由于复合材料的补偿效应．
The investigations carried out by extensive stability tests on LaCrO3, NiMn2O4 and their compositematerials revealed that the composite materials are greatly superior to single-phase materials in stability.The causes of resistance variation on single phase materials during ageing were analysed applying thedefect chemistry theory. The research suggested that the reduction of oxygen vacancies concentrations,which results from that the absorbed oxygen in the surface and pores of cerandcs diffused gradually intograins, decrease the resistrivity of p-type semiconductor ceramics LaCrO3 and increases that of n-type semiconductor ceramics NiMn2O4. thus it was condluded that the exceedingly good high-temperature-resistant characteristics of composite electroceramics are attributed to the compensation effect of composite materials.
参考文献
| [1] |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%