Synthesis and characterization of nanocrystalline FexOy/Gd2O3/SiO2 composite powder
Abstract
In this work, sol gel method was used to prepare FexOy/Gd2O3/SiO2 composite system starting from two different iron precursors: iron nitrate and iron oxide xerogel. The obtained samples were subjected to heat treatment at different temperatures under atmospheric conditions. Thermal evolution of the prepared samples has been systematically investigated by using X-ray diffraction (XRD) analysis and Fourier transform infrared spectroscopy (FTIR). Samples calcined at 1030 degrees C were also characterized by transmission electron microscopy (TEM) and vibrating sample magnetometer (VSM) experimental techniques. Effect of thermal treatment on phase formation in the prepared composite system has been discussed. It was found that iron nitrate based sample developed only alpha-Fe2O3 structural phase, while the sample based on the iron oxide xerogel developed alpha-Fe2O3 and gamma-Fe2O3 phases, with both of them remaining stable up to temperatures as high as 1030 degrees C. Gadolinium precursor ...crystallized directly in low-temperature triclinic B-type gadolinium disilicate Gd2Si2O7 (Gd2O3 center dot 2SiO(2)) phase at 900 degrees C, without formation of intermediate monosilicate phase. No other crystalline phases related to gadolinium were observed.
Keywords:
Sol-gel processes / Maghemite (gamma-Fe2O3) / Hematite (alpha-Fe2O3) / Gadolinium disilicate (Gd2Si2O7)Source:
Ceramics International, 2017, 43, 16, 14044-14049Funding / projects:
- Superconductivity, Magnetism, and Fluctuation Phenomena (RS-MESTD-Basic Research (BR or ON)-171027)
- Magnetic and radionuclide labeled nanostructured materials for medical applications (RS-MESTD-Integrated and Interdisciplinary Research (IIR or III)-45015)
- Physics and Chemistry with Ion Beams (RS-MESTD-Integrated and Interdisciplinary Research (IIR or III)-45006)
DOI: 10.1016/j.ceramint.2017.07.138
ISSN: 0272-8842; 1873-3956
WoS: 000411299300130
Scopus: 2-s2.0-85025099358
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Institution/Community
VinčaTY - JOUR AU - Milić, Mirjana M. AU - Nikolić, Violeta N. AU - Jovanović, Sonja PY - 2017 UR - https://vinar.vin.bg.ac.rs/handle/123456789/1735 AB - In this work, sol gel method was used to prepare FexOy/Gd2O3/SiO2 composite system starting from two different iron precursors: iron nitrate and iron oxide xerogel. The obtained samples were subjected to heat treatment at different temperatures under atmospheric conditions. Thermal evolution of the prepared samples has been systematically investigated by using X-ray diffraction (XRD) analysis and Fourier transform infrared spectroscopy (FTIR). Samples calcined at 1030 degrees C were also characterized by transmission electron microscopy (TEM) and vibrating sample magnetometer (VSM) experimental techniques. Effect of thermal treatment on phase formation in the prepared composite system has been discussed. It was found that iron nitrate based sample developed only alpha-Fe2O3 structural phase, while the sample based on the iron oxide xerogel developed alpha-Fe2O3 and gamma-Fe2O3 phases, with both of them remaining stable up to temperatures as high as 1030 degrees C. Gadolinium precursor crystallized directly in low-temperature triclinic B-type gadolinium disilicate Gd2Si2O7 (Gd2O3 center dot 2SiO(2)) phase at 900 degrees C, without formation of intermediate monosilicate phase. No other crystalline phases related to gadolinium were observed. T2 - Ceramics International T1 - Synthesis and characterization of nanocrystalline FexOy/Gd2O3/SiO2 composite powder VL - 43 IS - 16 SP - 14044 EP - 14049 DO - 10.1016/j.ceramint.2017.07.138 ER -
@article{ author = "Milić, Mirjana M. and Nikolić, Violeta N. and Jovanović, Sonja", year = "2017", abstract = "In this work, sol gel method was used to prepare FexOy/Gd2O3/SiO2 composite system starting from two different iron precursors: iron nitrate and iron oxide xerogel. The obtained samples were subjected to heat treatment at different temperatures under atmospheric conditions. Thermal evolution of the prepared samples has been systematically investigated by using X-ray diffraction (XRD) analysis and Fourier transform infrared spectroscopy (FTIR). Samples calcined at 1030 degrees C were also characterized by transmission electron microscopy (TEM) and vibrating sample magnetometer (VSM) experimental techniques. Effect of thermal treatment on phase formation in the prepared composite system has been discussed. It was found that iron nitrate based sample developed only alpha-Fe2O3 structural phase, while the sample based on the iron oxide xerogel developed alpha-Fe2O3 and gamma-Fe2O3 phases, with both of them remaining stable up to temperatures as high as 1030 degrees C. Gadolinium precursor crystallized directly in low-temperature triclinic B-type gadolinium disilicate Gd2Si2O7 (Gd2O3 center dot 2SiO(2)) phase at 900 degrees C, without formation of intermediate monosilicate phase. No other crystalline phases related to gadolinium were observed.", journal = "Ceramics International", title = "Synthesis and characterization of nanocrystalline FexOy/Gd2O3/SiO2 composite powder", volume = "43", number = "16", pages = "14044-14049", doi = "10.1016/j.ceramint.2017.07.138" }
Milić, M. M., Nikolić, V. N.,& Jovanović, S.. (2017). Synthesis and characterization of nanocrystalline FexOy/Gd2O3/SiO2 composite powder. in Ceramics International, 43(16), 14044-14049. https://doi.org/10.1016/j.ceramint.2017.07.138
Milić MM, Nikolić VN, Jovanović S. Synthesis and characterization of nanocrystalline FexOy/Gd2O3/SiO2 composite powder. in Ceramics International. 2017;43(16):14044-14049. doi:10.1016/j.ceramint.2017.07.138 .
Milić, Mirjana M., Nikolić, Violeta N., Jovanović, Sonja, "Synthesis and characterization of nanocrystalline FexOy/Gd2O3/SiO2 composite powder" in Ceramics International, 43, no. 16 (2017):14044-14049, https://doi.org/10.1016/j.ceramint.2017.07.138 . .