#TITLE_ALTERNATIVE#
Barium ferrite with hexagonal molecular structure (BaFe12O19) is known as a high performance permanent magnetic materials. Theoritically ; its fairly large magnetocrystalline anisotropy, high intrinsic coercivity (6700 Oe), high Curie temperature (450oC), relatively large magnetization (78 emu/g), a...
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| Format: | Final Project |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/10906 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Barium ferrite with hexagonal molecular structure (BaFe12O19) is known as a high performance permanent magnetic materials. Theoritically ; its fairly large magnetocrystalline anisotropy, high intrinsic coercivity (6700 Oe), high Curie temperature (450oC), relatively large magnetization (78 emu/g), as well as excellent chemical stability, and corrosion resistivity.<p>Barium ferrite nanoparticles with narrow particle size distribution and phase homogeneity are required to achieve high performance quality, so that can be permanent magnetic alternative, at least closed to rare-earth magnetic properties (NdFeB, SmCo). Many researches with various synthesis techniques has been developed, from conventional method until advanced techniques. By sol gel auto combustion method, has been resulted barium ferrite nanoparticles powder with good performance magnetic. Experimental case study were used ferrite nitrate (Fe(NO3)3. 9H2O) and barium nitrate (Ba(NO3)2) as oxidants, and citric acid (C6H8O7. H2O) as fuels. They were as starting materials then dissolved with aquabidestilate solution. Experimental parameters are Fe/Ba mole ratios = 12 and 11.5, various pH = 2, 3, 4, and 5, were adjusted by adding ammonia solution (NH4OH). Then metal nitrates/citris acid mole ratio = 1 : 2 and calcination temperatures are 550oC, 650oC, 750oC, dan 950oC. Thermal dehydration process were used heating microwave. Barium ferrite powder has been resulted, were characterized by using XRD, SEM, DTA/TG techniques, and Permagraph Magnetometer.<p>Fe/Ba mole ratio = 11.5 has been giving better magnetic properties and results single phase barium ferrite at lowest temperature 750oC. pH 3 was optimum acid pH condition. Various calcination temperature shows reaction stages to form single phase barium ferrite. The best permanent magnetic properties has been resulted by Fe/Ba mole ratio = 11.5, pH 3, at temperature 950oC, with value ; Br = 1790 Gauss, Hc = 5710 Oe, Ms = 69.66 emu/g, Mr = 57.47 emu/g, and BHmax = 0.66 MGOe. <br />
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