Document Details

Document Type : Thesis 
Document Title :
Mössbauer Effect Study of Some Nano metric Samples Containing Iron
دراسة طيف الرنين النووي لأشعة جاما(طيف موسباور) لبعض العينات النانومترية المحتوية
 
Subject : Effect 
Document Language : Arabic 
Abstract : This research is a Mössbauer spectroscopic study carried out at room temperature and down to low temperatures between (20~70° K) for pseudobrookite, Fe2TiO5 and for different series of spinel compounds, MeFe2O4, Me=(Zn, Co, Cu, Ni, ZnCo). Both oxalate precursor and coprecipitation methods has been used respectively to prepare both pseudobrookite and spinel series. X-Ray diffraction measurements were performed at room temperature in order to verify some structural properties of the prepared samples (ca. lattice parameters and grain size distribution). In this work it has been shown that the preparation methodology is crucial in the outcoming magnetic behavior of the obtained materials. Most of the samples behave in a similar way as superparamagnetic particles with a broad size distribution. This was especially observed by Mössbauer spectroscopy showing spectra containing simultaneously a sextet and a doublet and in which the latter increase at the expense of the sextet. On one hand, the magnetic behavior of the pseudobrookite series as obtained from Mössbauer spectroscopy was typical superparamagnetic behavior at room temperature (exhibiting a doublet). This can be attributed to the presence of magnetic clusters with a wide range of sizes, however the spectra reflect more ionic spin relaxation and show a sharp transition at 20°K to a sextet, i.e. change from paramagnetism to spin glass state order at lower temperature. On the other hand, magnetic transition from paramagnetism to antifromagnetic state was observed at 20°K for Zn ferrite samples. Finally, the power of Mössbauer spectroscopy in such kind of investigations has been clearly demonstrated in this work. 
Supervisor : MAMDOUH ABDEL AAL AHMED ABDEL AAL 
Thesis Type : Doctorate Thesis 
Publishing Year : 1432 AH
2011 AD 
Number Of Pages : 192 
Added Date : Sunday, July 7, 2013 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
نجلاء ابراهيم الجريدALJURAID, NAJLAA IBRAHIMInvestigator  

Files

File NameTypeDescription
 35682.pdf pdf 
 35683.pdf pdf 

Back To Researches Page