Volume 20, Issue 2 (June 2023)                   IJMSE 2023, 20(2): 1-11 | Back to browse issues page


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rastgoo oskoui P, rezvani M, kianvash A. Effect of Heat-Treatment Temperatures on Magnetite Oxidation in 20SiO2.50FeO.30CaO Glass Ceramic Prepared by the Sol-Gel Method. IJMSE 2023; 20 (2) :1-11
URL: http://ijmse.iust.ac.ir/article-1-3238-en.html
Abstract:   (3749 Views)
Abstract
The effect of different heat-treatment temperatures on the magnetic, crystallization, and structural properties of 20SiO2.50FeO.30CaO (mol%) glass ceramics was studied. The initial glass was synthesized by the sol-gel method at 25  with a precursors to solvent ratio of 1/5. After aging the resulted gel for 24 h at room temperature, it was dried in an electric dryer at 110 . By heat treatment at different temperatures, different phases such as magnetite, maghemite, and hematite were crystallized in the glass. The maximum stability temperature of magnetite and maghemite were 360  and 440  respectively. By increasing the heat treatment temperature to higher than 440 , the oxidation of maghemite to hematite was occureds. The highest magnetization amount (1.9 emu/g) belonged to sample heat treated at 680 . By increasing the heat treatment temperature to 840 , the magnetization decreased to 0.8 emu/g, due to the oxidation of maghemite. By increasing the heat treatment temperature from 440  to 680 , crystalline size of maghemite was increased from 40 to 200 nm. By forther increment of temperature to 840 , the size of maghemite crystals decreased to 17nm, due to the oxidation of maghemite to hematite.
Abstract
The effect of different heat-treatment temperatures on the magnetic, crystallization, and structural properties of 20SiO2.50FeO.30CaO (mol%) glass ceramics was studied. The initial glass was synthesized by the sol-gel method at 25  with a precursors to solvent ratio of 1/5. After aging the resulted gel for 24 h at room temperature, it was dried in an electric dryer at 110 . By heat treatment at different temperatures, different phases such as magnetite, maghemite, and hematite were crystallized in the glass. The maximum stability temperature of magnetite and maghemite were 360  and 440  respectively. By increasing the heat treatment temperature to higher than 440 , the oxidation of maghemite to hematite was occureds. The highest magnetization amount (1.9 emu/g) belonged to sample heat treated at 680 . By increasing the heat treatment temperature to 840 , the magnetization decreased to 0.8 emu/g, due to the oxidation of maghemite. By increasing the heat treatment temperature from 440  to 680 , crystalline size of maghemite was increased from 40 to 200 nm. By forther increment of temperature to 840 , the size of maghemite crystals decreased to 17nm, due to the oxidation of maghemite to hematite.
 
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Type of Study: Research Paper | Subject: Ceramics

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