材料导报
材料導報
재료도보
MATERIALS REVIEW
2009年
22期
28-30
,共3页
门高夫%杜晓燕%谢艳%王玉国%郭光华
門高伕%杜曉燕%謝豔%王玉國%郭光華
문고부%두효연%사염%왕옥국%곽광화
双钙钛矿%溶胶-凝胶法%反占位缺陷%饱和磁化强度
雙鈣鈦礦%溶膠-凝膠法%反佔位缺陷%飽和磁化彊度
쌍개태광%용효-응효법%반점위결함%포화자화강도
double perovskite%sol-gel method%antisite defects%saturation magnetization
采用溶胶一凝胶法在不同烧结温度下制备了双钙钛矿结构化合物Sr_2FeMoO_6,研究了烧结温度对样品B位阳离子的有序度和饱和磁化强度的影响,测量了样品电阻率随温度变化的曲线.X射线衍射实验表明,所有样品中无杂相产生,晶体结构均为四方结构.样品的有序度随烧结温度的升高而增大,而有序度越高的样品饱和磁化强度也越大;样品在30000Oe磁场下的导电行为呈现出由半导体导电行为(低温区T≈10~80K)向金属导电行为(高温区了T≈80~300K)的转变.
採用溶膠一凝膠法在不同燒結溫度下製備瞭雙鈣鈦礦結構化閤物Sr_2FeMoO_6,研究瞭燒結溫度對樣品B位暘離子的有序度和飽和磁化彊度的影響,測量瞭樣品電阻率隨溫度變化的麯線.X射線衍射實驗錶明,所有樣品中無雜相產生,晶體結構均為四方結構.樣品的有序度隨燒結溫度的升高而增大,而有序度越高的樣品飽和磁化彊度也越大;樣品在30000Oe磁場下的導電行為呈現齣由半導體導電行為(低溫區T≈10~80K)嚮金屬導電行為(高溫區瞭T≈80~300K)的轉變.
채용용효일응효법재불동소결온도하제비료쌍개태광결구화합물Sr_2FeMoO_6,연구료소결온도대양품B위양리자적유서도화포화자화강도적영향,측량료양품전조솔수온도변화적곡선.X사선연사실험표명,소유양품중무잡상산생,정체결구균위사방결구.양품적유서도수소결온도적승고이증대,이유서도월고적양품포화자화강도야월대;양품재30000Oe자장하적도전행위정현출유반도체도전행위(저온구T≈10~80K)향금속도전행위(고온구료T≈80~300K)적전변.
The double-perovskite Sr_2FeMoO_6 compounds have been prepared under different sintering temperature by sol-gel method. The influence of sintering temperature on B site cationic ordering degree and saturation magnetization is investigated. At the same time, the curve of resistivity is measured. X-ray powder diffraction profiles indicates that all the samples are pure phase and crystal structure is tetragonal. The samples' ordering degree increases with the sintering temperature rising. The higher ordering degree is, the higher saturation magnetization is. The sample show a conversion from semi-conductor conduction behavior to metal conductor behavior in the case that the magnetic field is 30000Oe.