【摘要】 采用固相烧结工艺制备MnxSr2?xBi4Ti5O18(A-SBTi-x,x=0～0.08)和Sr2Bi4MnyTi5?yO18(B-SBTi-y,y=0～0.08)陶瓷样品,对比研究它们的结构和电磁性能。X射线衍射谱显示A位Mn掺杂对材料晶格常数a影响较大:零掺杂时,a=0.386 8 nm;当Mn摩尔掺量为0.02时,a减小为0.385 6 nm;此后a随Mn掺量增加而增加,最大达到0.387 0 nm。B位Mn掺杂对晶格常数的影响较小。当Mn掺量很小时,A位和B位掺杂对剩余极化强度(2Pr)的影响不同;当Mn掺量较多时,A位和B位掺杂对2Pr的影响相似。室温,两种晶位掺杂的Mn离子均使材料表现出弱铁磁性。更多还原

【Abstract】 MnxSr2-xBi4Ti5O18(A-SBTi-x,x=0-0.08) and Sr2Bi4MnyTi5-yO18(B-SBTi-y,y=0-0.08) ceramic samples were prepared using the solid-state reaction.Crystal structure,ferroelectric,dielectric and magnetic properties were investigated and compared.The X-ray diffraction results indicate the formation of single-phase material.Lattice constant a varies slightly for B-SBTi-y,while the lattice constant of A-SBTi-x vary dramatically.The lattice constant a of the A-SBTi-x decreases from 0.386 8 nm with x=0 to 0.385 6 nm at x=0.02,then increases with further Mn substitution and reaches 0.387 0 nm at x=0.08.Remnant polarization(2Pr) of A-SBTi-x and B-SBTi-y varies differently when x and y are quite low.As x and y values increase further,the changes of 2Pr are similar.Both A-SBTi-x and B-SBTi-y have a weak ferromagnetic nature at room temperature.更多还原