T Devender Reddy, G Padmasree, Sreedhar Yelipeddy, P Yadagiri Reddy, Ch Gopal Reddy
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引用次数: 0
摘要
本文介绍了镨（Pr）掺杂在氧化钇铁（YFeO3）样品中的结构、磁性和Mössbauer研究。采用溶胶-凝胶法制备了化学式为PrxY1−xFeO3 （x = 0.0、0.2、0.4、0.6、0.8和1.0）的样品。利用x射线衍射（XRD）和拉曼光谱技术对样品进行了表征。Rietveld细化XRD图显示出尖锐的强度峰，证实了样品具有晶体性质和畸变正交结构。从拉曼光谱研究中发现，模式向低波数侧移动，证实了Pr取代了y。随着Pr在YFeO3中掺杂浓度的增加，样品的磁性从弱铁磁性下降到反铁磁性。57Fe Mössbauer光谱研究表明，一个六重体与其他由磁性杂质产生的六重体重叠。同分异构体位移值为0.27 mm s−1，表明Fe离子处于高自旋铁态。超细场（Bhf）值随Pr浓度的增加而增加。
Magnetic and 57Fe Mössbauer studies of praseodymium (Pr) substituted yttrium iron oxide (YFeO3) materials prepared by sol-gel technique
Structural, magnetic and Mössbauer studies of praseodymium (Pr) doped in yttrium iron oxide (YFeO3) samples are presented in this paper. Samples having chemical formula of PrxY1−xFeO3 (where, x = 0.0, 0.2, 0.4, 0.6, 0.8 and 1.0) were prepared by using sol-gel method. X-ray diffraction (XRD) and Raman spectroscopy techniques were used to characterize the samples. Rietveld refined XRD graphs show sharp intensity peaks which confirmed that the samples possess crystalline nature and have distorted orthorhombic structure. From Raman spectroscopic studies it was observed that the modes shifted towards lower wave number side confirming that Pr got substituted in place of Y. It was observed that with increase in Pr doping concentration in YFeO3, the magnetic nature of the samples decreased from weak ferromagnetic nature to anti ferromagnetic nature. 57Fe Mössbauer spectroscopic studies showed a sextet overlapped by additional sextets which were generated from magnetic impurities. Isomer shift value of 0.27 mm s−1 indicated that Fe ion was in its high spin ferric state. The hyperfine field (Bhf) values were found to increase with increase in Pr concentration.
期刊介绍：
The Bulletin of Materials Science is a bi-monthly journal being published by the Indian Academy of Sciences in collaboration with the Materials Research Society of India and the Indian National Science Academy. The journal publishes original research articles, review articles and rapid communications in all areas of materials science. The journal also publishes from time to time important Conference Symposia/ Proceedings which are of interest to materials scientists. It has an International Advisory Editorial Board and an Editorial Committee. The Bulletin accords high importance to the quality of articles published and to keep at a minimum the processing time of papers submitted for publication.
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