Solid state sintering and microstructural evolution on wide frequency range dielectric responses of mechanically activated CaTiO3 ceramics
The CaTiO3 samples were prepared by high-energy ball milling process followed by sintering process from 1040 to 1200°C. X-ray diffraction (XRD), microstructural analysis, and dielectric properties over a wide range of frequency varying from 0.01 Hz to 1 GHz at room temperature were investigated. The...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Trans Tech Publications
2015
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| Online Access: | http://psasir.upm.edu.my/id/eprint/46332/1/Solid%20state%20sintering%20and%20microstructural%20evolution%20on%20wide%20frequency%20range%20dielectric%20responses%20of%20mechanically%20activated%20CaTiO3%20ceramics.pdf |
| _version_ | 1825929674127048704 |
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| author | Wong, Yick Jeng Hassan, Jumiah Hashim, Mansor |
| author_facet | Wong, Yick Jeng Hassan, Jumiah Hashim, Mansor |
| author_sort | Wong, Yick Jeng |
| collection | UPM |
| description | The CaTiO3 samples were prepared by high-energy ball milling process followed by sintering process from 1040 to 1200°C. X-ray diffraction (XRD), microstructural analysis, and dielectric properties over a wide range of frequency varying from 0.01 Hz to 1 GHz at room temperature were investigated. The formation of a single phase CaTiO3 with orthorhombic structure was achieved at 1120°C and above. From a morphological point of view, sintering temperature promoted grain growth. Dielectric properties in the frequency range 0.01 Hz - 1 MHz revealed a relaxation-type process. Interfacial phenomena were the possible physical mechanisms that gave rise to these relaxation-type plots. Extending the frequencies above ~1 MHz yielded a frequency-independent characteristic of dielectric constant (ε'). These turned out to the relatively small dielectric loss (tan δ) values. The origin of the dielectric responses in the frequency range 1 MHz - 1 GHz was attributed to the domination of dipolar polarization. The grain size effect in sintered CaTiO3 samples was prominent, notably in dielectric responses above ~1 MHz. Increase in sintering temperature remarkably led to an enhancement in dielectric constant values and reduction in dielectric loss values. Therefore, a significant correlation existed between microstructural features and dielectric properties. |
| first_indexed | 2024-03-06T09:00:10Z |
| format | Article |
| id | upm.eprints-46332 |
| institution | Universiti Putra Malaysia |
| language | English |
| last_indexed | 2024-03-06T09:00:10Z |
| publishDate | 2015 |
| publisher | Trans Tech Publications |
| record_format | dspace |
| spelling | upm.eprints-463322022-06-17T08:07:48Z http://psasir.upm.edu.my/id/eprint/46332/ Solid state sintering and microstructural evolution on wide frequency range dielectric responses of mechanically activated CaTiO3 ceramics Wong, Yick Jeng Hassan, Jumiah Hashim, Mansor The CaTiO3 samples were prepared by high-energy ball milling process followed by sintering process from 1040 to 1200°C. X-ray diffraction (XRD), microstructural analysis, and dielectric properties over a wide range of frequency varying from 0.01 Hz to 1 GHz at room temperature were investigated. The formation of a single phase CaTiO3 with orthorhombic structure was achieved at 1120°C and above. From a morphological point of view, sintering temperature promoted grain growth. Dielectric properties in the frequency range 0.01 Hz - 1 MHz revealed a relaxation-type process. Interfacial phenomena were the possible physical mechanisms that gave rise to these relaxation-type plots. Extending the frequencies above ~1 MHz yielded a frequency-independent characteristic of dielectric constant (ε'). These turned out to the relatively small dielectric loss (tan δ) values. The origin of the dielectric responses in the frequency range 1 MHz - 1 GHz was attributed to the domination of dipolar polarization. The grain size effect in sintered CaTiO3 samples was prominent, notably in dielectric responses above ~1 MHz. Increase in sintering temperature remarkably led to an enhancement in dielectric constant values and reduction in dielectric loss values. Therefore, a significant correlation existed between microstructural features and dielectric properties. Trans Tech Publications 2015 Article PeerReviewed text en http://psasir.upm.edu.my/id/eprint/46332/1/Solid%20state%20sintering%20and%20microstructural%20evolution%20on%20wide%20frequency%20range%20dielectric%20responses%20of%20mechanically%20activated%20CaTiO3%20ceramics.pdf Wong, Yick Jeng and Hassan, Jumiah and Hashim, Mansor (2015) Solid state sintering and microstructural evolution on wide frequency range dielectric responses of mechanically activated CaTiO3 ceramics. Advanced Materials Research, 1107. pp. 38-44. ISSN 1022-6680; ESSN: 1662-8985 https://www.scientific.net/AMR.1107.38 10.4028/www.scientific.net/AMR.1107.38 |
| spellingShingle | Wong, Yick Jeng Hassan, Jumiah Hashim, Mansor Solid state sintering and microstructural evolution on wide frequency range dielectric responses of mechanically activated CaTiO3 ceramics |
| title | Solid state sintering and microstructural evolution on wide frequency range dielectric responses of mechanically activated CaTiO3 ceramics |
| title_full | Solid state sintering and microstructural evolution on wide frequency range dielectric responses of mechanically activated CaTiO3 ceramics |
| title_fullStr | Solid state sintering and microstructural evolution on wide frequency range dielectric responses of mechanically activated CaTiO3 ceramics |
| title_full_unstemmed | Solid state sintering and microstructural evolution on wide frequency range dielectric responses of mechanically activated CaTiO3 ceramics |
| title_short | Solid state sintering and microstructural evolution on wide frequency range dielectric responses of mechanically activated CaTiO3 ceramics |
| title_sort | solid state sintering and microstructural evolution on wide frequency range dielectric responses of mechanically activated catio3 ceramics |
| url | http://psasir.upm.edu.my/id/eprint/46332/1/Solid%20state%20sintering%20and%20microstructural%20evolution%20on%20wide%20frequency%20range%20dielectric%20responses%20of%20mechanically%20activated%20CaTiO3%20ceramics.pdf |
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