Siti Amirah, Syed Abu Bakar (2017) Microstrucral and electrical properties of rare earth ionic doped CCTO ceramics. Faculty of Industrial Sciences and Technology, Universiti Malaysia Pahang.
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Abstract
Calcium Copper Titanate (CCTO) is one of ceramics that is noteworthy for its extremely large dielectric constant in application of ceramics. In order to improve the properties and application of calcium copper titanate, the doping of rare earth which is lanthanum and ytterbium in calcium copper titanate ceramics are study. The synthesis of lanthanum and ytterbium doped calcium copper titanate are done by investigating on the microstructure of the calcium copper titanate ceramics itself. Then, the electrical properties of the doping lanthanum and ytterbium to calcium copper titanate ceramics also been studied and investigated. Lanthanum and ytterbium doped calcium copper titanate with x = 0.005 for each of them. The method used for the preparation of all samples is via conventional solid state reaction method. The powder undergoes calcined at temperature of 700 oc for about 8 hours and process into pellet. After that the pellet is then been sintered at temperature 1000°C for another 8 hours. The crystal structure is investigated. For the X-ray diffraction patterns, lanthanum and ytterbium ions has entered the unit cell and substituted the Ca2+ ions on the A site of cubic structure. The lattice parameter is decrease as decreasing ionic radius of rare earth elements. For FESEM micrograph, the grain size is decreasing as doping with lanthanum ions but increasing as doped with ytterbium ions. The average grain size of pure CCTO is 1.494 µm, 1.024 µm for La doped CCTO and 1.328 µm for Yb doped CCTO. The addition of lanthanum to the CCTO ceramics lead to drop in value of dielectric permittivity of CCTO ceramics. However, dielectric permittivity is increase once ytterbium is added to CCTO ceramics. The maximum dielectric permittivity of pure CCTO, La doped CCTO and Yb doped CCTO is 5.50 x 107,4.18 x 107 and 2.43 x 107 at frequency of 1.00 x 103 Hz. Then, for the dielectric loss of CCTO ceramics is increase as doping with rare earth element. The dielectric loss of pure CCTO, La doped CCTO and Yb doped CCTO is 9.749 x 10-3,1.830 x 10·3 and 1.477 x 10·3.
| Item Type: | Undergraduates Project Papers |
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| Additional Information: | Project Paper (Bachelor of Applied Science (Honor) Material Technology) -- Universiti Malaysia Pahang – 2017, SV: MISS MAZNI MUSTAFA, NO. CD: 12484 |
| Uncontrolled Keywords: | Calcium Copper Titanate (CCTO); rare earth |
| Subjects: | Q Science > Q Science (General) T Technology > T Technology (General) T Technology > TP Chemical technology |
| Faculty/Division: | Faculty of Industrial Sciences And Technology |
| Depositing User: | Mrs. Sufarini Mohd Sudin |
| Date Deposited: | 16 Feb 2021 10:40 |
| Last Modified: | 16 Feb 2021 10:40 |
| URI: | http://umpir.ump.edu.my/id/eprint/30494 |
| Download Statistic: | View Download Statistics |
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