Nanostructured Ferrite Formation in Borosilicate Glass
We present the preparation, structural, and magnetic properties of a series of Fe-containing borosilicate glasses as a function of the ratio SiO2/Fe2O3 which is ranging from 1.49 to 2.68. The role of nucleators (Cr2O3 and P2O5) was also investigated. X-Ray diffraction has revealed the formation of magnetite as the major or unique crystalline phase. As SEM micrographs have revealed, the addition of P2O5 give rise to a finer structure as compared with Cr2O3. In addition, the same oxide decreases the temperature of structural transition with almost 100 ℃. The magnetization data reveal a two step transition at low temperatures: a high temperature transition at Tv = 128 K, which we attribute to the Verwey transition, and a low temperature transition at Ts = 48 K which, most likely, is the result of change in the dynamic of the domain motion.
Magnetite borosilicate glass crystallization Verwey transition ferrimagnetism
Viorel Sandu Stelian Popa Iuliana Pasuk Ionut Enculescu Mirela Sidonia Nicolescu Simona Radicescu
National Institute of Materials Physics Bucharest, 105 b Atomistilor Str., Magurele, J. Ilfov, 07712 National Institute of Glass SA, 47 Theodor Pallady Blv., S.3, Bucuresti, 032258, Romania
国际会议
青岛
英文
445-448
2009-10-09（万方平台首次上网日期，不代表论文的发表时间）