摘要
利用常规的固相反应法制备了单相多晶样品Sr14Cu24O41+δ,并在不同的温度下进行退火,改变样品中的氧含量.能量色散谱(EDS)显示样品中的氧含量随退火温度的增加而减少.磁化率温度特性的研究显示,600℃下退火的样品中的二聚体数最多.Raman光谱的研究显示,伴随着样品中氧含量的偏离,由无序或低能磁激发诱导的一些Raman振动模出现规律性的变化.进一步的分析证实这种Raman光谱的变化行为与晶体结构中由于氧含量的不同导致的Sr14Cu24O41中晶格失配比率对10/7的不同偏离程度有关.
he spin ladder compounds Sr14Cu24O41＋δ were synthesized by conventional solid state reaction method with subsequent annealing at 400,500,600,800 and 900 ℃,respectively.The energy dispersive spectroscope（EDS） measurement confirms that the content of oxygen in the samples decreases with the increasing of annealing temperature.The measurement of magnetic susceptibility reveals that the sample annealing at 600 ℃ has the largest number of dimers.The measurement of Raman spectrum shows some new Raman vibrational features.Corresponding to δ0 or δ0 in the sample,some Raman modes appear,and some other Raman modes disappear,which is due to the fact that the lattice distortion α= cl/cc is near the minimal value 10/7 and the Cu—O bond has relatively long length.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2010年第7期5078-5084,共7页
Acta Physica Sinica
基金
国家自然科学基金(批准号:10674105)资助的课题~~
