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Nd_0.52Sr_0.48MnO₃多晶陶瓷的磁性和相分离

MAGNETIC PROPERTIES AND PHASE SEPARATION IN Nd_0.52Sr_{0. 48}MnO₃ POLYCRYSTALLINE CERAMIC

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【Author】 LIU Xindian, JIANG Enyong, LI Yangxian, LIU Hui, LI Wencheng Mi Wenbo LI ZhiqingSchool of Science, Tianjin University, Tianjin 300072;Key Laboratory for Advanced Ceramics and Machining Technology of Ministry Education, Tianjin University, Tianjin 300072;School of Material Science and Engineering, Hebei University of Technology, Tianjin 300130

【机构】天津大学理学院；河北工业大学材料科学与工程学院；天津大学理学院天津 300072 天津大学先进陶瓷和加工技术教育部重点实验室天津 300072；天津 300072 天津大学先进陶瓷和加工技术教育部重点实验室天津 300072；天津 300130；天津 300072；天津 300072 天津大学先进陶瓷和加工技术教育部重点实验室天津 300072；

【摘要】实验研究了用Pechini方法制备的Nd_0.52Sr_0.48MnO₃多晶样品的磁性和电子自旋共振特性.在Curie温度以上,Nd_0.52Sr_0.48MnO₃表现为顺磁性,这时的电子自旋共振积分谱表现为单一的Lorentz峰;在Néel温度和Curie温度之间,电子自旋共振积分谱由两个Gauss峰组成,表明发生了相分离;在Néel温度以下,我们发现在反铁磁母体中仍有大量的铁磁团簇存在.更多还原

【Abstract】 Polycrystalline Ndo0.52Sr0.48MnO3 ceramic is prepared by Pechini process and its electron spin resonance spectra, magnetic properties have been investigated experimentally. At temperature above TC (Curie), the compound is paramagnetic and the electron spin spectra consist of a single Lorentzian line centered at about g=2.00. For temperature TN (Neel) < T < TC, the spectra become broad and an additional bump (or shoulder) appears. In this situation, the electron spin spectra can be successfully reproduced by two split lines which shows that the paramagnetic and ferromagnetic phase coexist in Nd0.52Sr0.48MnO3 compound. There are still lots of ferromagnetic clusters mixing in the antiferromagnetic matrix below TN.更多还原