Structural and magnetic properties of glass-ceramics containing silver and iron oxide

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• 作者：K. Sharma^a ; ^{ksharma_iit@yahoo.co.in} ; Sher Singh Meena^b ; Sudhanshu Saxena^c ; S.M. Yusuf^b ; A. Srinivasan^d ; G.P. Kothiyal^a ; ^{gpkoth@barc.gov.in}
• 关键词：Glasses ; Nanostructures ; Magnetic materials ; Mö ; ssbauer spectroscopy
• 刊名：Materials Chemistry and Physics
• 出版年：2012
• 期刊代码：58_02540584
• 类别：ms
• 出版时间：15 March, 2012
• 卷：133
• 期：1
• 页码：144-150
• 文件大小：1282 K

摘要

Glass-ceramics with a nominal composition of 25SiO₂-(50 鈭?#xA0;x)CaO-15P₂O₅-8Fe₂O₃-2ZnO-xAg (where x = 0, 2 and 4 mol%) have been prepared. Structural features of glass-ceramics have been investigated using X-ray diffraction (XRD) and scanning electron microscope (SEM) techniques. Magnetic properties were studied using vibrating sample magnetometer and M枚ssbauer spectroscopy. Ca₃(PO₄)₂, hematite and magnetite are formed as major crystalline phases. The microstructure reveals the formation of 25-30 nm size particles. M枚ssbauer spectroscopy has shown the relaxation of magnetic particles. Saturation magnetization value is increased with an increase of Ag content up to 4 mol%, which has been attributed to the formation of magnetically ordered particles. The antibacterial response was found to depend on Ag ions concentration in the glass matrix and samples with 4 mol%Ag in glass matrix have shown effective antibacterial activity against Escherichia coli.