Nano particles of iron oxides in SiO2 glass prepared by ion implantation

作者：Nomura K^*; Reuther H

来源：Journal of Radioanalytical and Nuclear Chemistry, 2011, 287(1): 341-346.

DOI：10.1007/s10967-010-0858-0

• Nano particles of iron in SiO2 matrix
• Ion implantation
• epsilon-Fe2O3
• Transparent magnetic glass
• Room temperature magnetism

Quartz (SiO2) glass was implanted with 5 x 10(16) Fe-57 ions/cm(2) at a substrate temperature of 500 degrees C, and annealed at temperatures between 700 and 950 degrees C. The implanted and annealed plates were characterized by conversion electron Mossbauer spectroscopy (CEMS), and measured by a Kerr effect magnetometer or a vibration sample magnetometer. Kerr effect measurement of as-implanted SiO2 glass showed ferromagnetism at room temperature. CEM spectrum of the as-implanted glass consisted of magnetic relaxation peaks of finely dispersed metallic Fe species, and paramagnetic doublets of Fe3+ and Fe2+ species. The sample heated at 700 degrees C contained large grains of metallic Fe and a lot of oxidation products of Fe2+ species. After oxidation at temperatures higher than 800 degrees C, the samples showed also ferromagnetism, which was attributed mainly to ferromagnetic epsilon-Fe2O3 precipitated in SiO2 matrix. Small amounts of alpha-Fe2O3 were produced at 950 degrees C. The results suggest that ion implantation and oxidation make a transparent ferromagnetic glass possible.

• 出版日期2011-1