CAJ | 학술논문

对不同外磁场强度(B=0T,5T和10T)下退火的纳米BiFeO_3颗粒进行了室温和液氮温度下的拉曼光谱研究.实验发现,与OT磁场下退火样品的Raman光谱相比,同一温度下,纳米BiFeO_3颗粒中的Raman振动模式峰的线宽随着磁场的增加而减小,表明在外磁场的作用下,纳米BiFeO_3.颗粒内部的缺陷在减少,晶格完整性得到改善.经外磁场处理的纳米BiFeO_3颗粒位于139 cm~(-1)处的A-1模式峰明显向紫端移动,说明磁有序的程度可以影响到声子-自旋耦合.5T和10T磁场下退火的样品相比,该峰峰位没有明显改变,说明影响样品中磁有序排列的磁场存在一个临界值.三块样品的低温拉曼光谱证实了磁场的作用确实影响样品内磁有序的排列.
대불동외자장강도(B=0T,5T화10T)하퇴화적납미BiFeO_3과립진행료실온화액담온도하적랍만광보연구.실험발현,여OT자장하퇴화양품적Raman광보상비,동일온도하,납미BiFeO_3과립중적Raman진동모식봉적선관수착자장적증가이감소,표명재외자장적작용하,납미BiFeO_3.과립내부적결함재감소,정격완정성득도개선.경외자장처리적납미BiFeO_3과립위우139 cm~(-1)처적A-1모식봉명현향자단이동,설명자유서적정도가이영향도성자-자선우합.5T화10T자장하퇴화적양품상비,해봉봉위몰유명현개변,설명영향양품중자유서배렬적자장존재일개림계치.삼괴양품적저온랍만광보증실료자장적작용학실영향양품내자유서적배렬.
Raman scattering study of BiFeO_3 nanopariticles annealed by different magnetic field was carried out at room temperature and 77K.It is found that,comparing with Raman spectra of sample annealed directly,line widths of Raman vibration mode peaks decrease with extra magnetic field intensity increasing,indicating that inner detects reduce and lattice integrality improve in BiFeO_3 nanopariticles affected by extra magnetic field.Al mode peak around 139 cm~(-1)in BiFeO_3 nanopariticles annealed by extra magnetic field obviously shift to the higher frequency,showing that magnetic ordering may affect phononspin coupling.Comparing the samples annealed by 5T and 10T extra magnetic field,no distinct change is found,explaining that there is a critical magnetic value affecting arrangement of magnetic ordering.Raman spectra of three samples at 7 7 K reconfirm that magnetic field actually affected arrangement of magnetic ordering.