摘要
研究了La2O3,TiO2和MnO2氧化物添加剂及其添加量对镍铁尖晶石阳极材料烧结性能及电导率的影响,并探讨了其导电机理。试验结果表明,La2O3不能改善试样的烧结性能及电导率,而添加量为1%(质量比)的TiO2氧化物添加剂可显著提高试样的烧结性能及电导率。其高温导电机理为P-型半导体和n-型半导体结构混合影响的小极化子跳跃理论。MnO2偏析于晶界,反而降低了试样的高温电导率。
The effects of La2O3, TiO2 and MnO2 additives and their contents on sintering properties and electric conductivity of NiFe2O4 spinel anode materials and the electric mechanisms were studied. The results showed that La2O3 could not improve the sintering properties and electric conductivities of NiFe2O4 spinel samples. The sintering properties and electric conductivity of NiFe2O4 spinel was highly enhanced with 1% （wt） TiO2 additive. And the electric mechanism was the small polaron hopping theory with the mixing function of P-semiconductor structure and n-semiconductor structure. Because of MnO2 dopant enriching at the crystal boundary, the high temperature conductivities of the obtained NiFe2O4 spinel are decreased.
出处
《矿冶工程》
CAS
CSCD
北大核心
2007年第1期72-74,共3页
Mining and Metallurgical Engineering
