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خواص ساختاري، مغناطیسی و حسگري گاز استون توسط هگزافریت باریم- کلسیم تولید شده بهروش سل- ژل خوداحتراقی

Authors :
آرزو کریمیان
مهدي کلانتر
Source :
Advanced Materials in Engineering; Spring2020, Vol. 39 Issue 1, p13-27, 15p
Publication Year :
2020

Abstract

In this research, barium calcium hexaferrite (Ba1-xCaxFe12O19, 0≤x1) nanoparticles were synthesized through a sol-gel combustion method. The dried gel samples were then calcined at 950ºC for 4:30h. The phase and microstructural evolution of calcined samples were investigated by X-ray powder diffraction (XRD) and scanning electron microscopy (SEM), respectively. The results revealed formation of calcium -barium hexaferrite phase with a small amount of hematite as a secondary phase. The average particle size is between 60-100 nm and the particle morphology is hexagonal or plate like structure. Results of a vibrating sample magnetometer (VSM) showed that the sample with x=0.4, exhibited the lowest value of saturation magnetization in comparison with others. This could be due to structural heterogeneity and presence of higher amounts of non- magnetic phases (BaFe2O4 and Fe2O3) in this sample compared to others. The results of sensory testing in acetone gas showed that the barium-calcium hexaferrite sample with x=0.2 had the highest sensitivity (0.28) and shortest response (15s) at a concentration of 900 ppm and a temperature of 200 °C despite of the long recovery time. [ABSTRACT FROM AUTHOR]

Details

Language :
Persian
ISSN :
2251600X
Volume :
39
Issue :
1
Database :
Complementary Index
Journal :
Advanced Materials in Engineering
Publication Type :
Academic Journal
Accession number :
144560461