BaO掺杂对10NiO-NiFe_2O_4复合陶瓷导电性能的影响

Effect of adding BaO on electrical conductivity of 10NiO-NiFe_2O_4 composite ceramics

利用冷压-烧结技术制备了BaO掺杂的10NiO-NiFe2O4复合陶瓷，研究了BaO掺杂量对10NiO—NiFe2O4复合陶瓷物相组成及电导率的影响。结果表明，当BaO掺杂量为0～4％（质量分数）时，烧结样品中主要含有NiO和NiFe2O4两种，BaO促进了致密化烧结，降低了烧结温度；TG—DSC分析发现，在303～1233K温度范围内，10NiO-NiFe2O4陶瓷在空气气氛中先吸氧后失氧；导电率测试表明，掺杂BaO能显著提高材料的高温电导率，且掺杂0．5％样品在1233K时材料达到最大电导率11．76S／cm，是未掺杂样品的12．8倍．

The BaO doped 10NiO- NiFe2O4 composite ceramics were prepared with the cold isostatic pressing-sintering process, the effects of BaO content on the phase composition and electrical conductivity of 10NiO- NiFe2O4 composite ceramics were studied. The results show that the samples are mainly consisted of NiO and NiFe2O4 when content of BaO is 0-4% （mass fraction）,BaO is important to accelerate the sintering densification and reduce sintering temperature. The analysis of TG-DSC find,the 10NiO- NiFe2O4 composite ceramics have an oxygen-losing process after gaining oxygen in the range of 303-1233K. The electrical conductivity tests show, the conductivity of 10NiO- NiFe2O4 composite ceramics doped BaO improves remarkably. When the mass fraction of BaO was 0.5% ,the conductivity of the sample was 11.76S/cm in 1233K,which was 12.8 times of the samples without BaO.