Photothermal study of doped ZnO ceramics
Photopyroelectric spectroscopy (PPES) is used to study the band-gap energy, Eg, of ZnO doped with 1 mol% MnO and 0 – 2.0 mol% of Er2O3 sintered at isothermal sintering temperatures, 1200 and 1300⁰C. The wavelength of incident light is kept in the range from 300 to 800 nm and the PPE spectrum with re...
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Universiti Putra Malaysia Press
2005
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| Online Access: | http://psasir.upm.edu.my/id/eprint/38672/ http://psasir.upm.edu.my/id/eprint/38672/1/38672.pdf |
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upm-386722015-06-03T04:27:04Z http://psasir.upm.edu.my/id/eprint/38672/ Photothermal study of doped ZnO ceramics Zakaria, Azmi Rizwan, Zahid Hashim, Mansor Shaari, Abdul Halim Mat Yunus, Wan Mahmood Photopyroelectric spectroscopy (PPES) is used to study the band-gap energy, Eg, of ZnO doped with 1 mol% MnO and 0 – 2.0 mol% of Er2O3 sintered at isothermal sintering temperatures, 1200 and 1300⁰C. The wavelength of incident light is kept in the range from 300 to 800 nm and the PPE spectrum with reference to the doping level and sintering temperature is discussed. Eg were estimated from the plot (ρhυ)2 vs hυ and the values are 2.12, 2.09 eV for the samples sintered at 1300 ⁰C, 1200 ⁰C, respectively, for 0 mol% of Er2O3 doping level. Eg becomes constant with the fluctuation about 1.8 % at all doping levels of Er2O3 mol% indicating that the interfacial states are not produced further in MnO-ZnO ceramics by Er2O3 mol%. The decrease in steepness factor is related to sintering temperature and Er2O3 mol%. The X-ray diffractrometry shows that the crystal structure of ZnO doped with 1 mol% of MnO and different mol% of Er2O3 at all sintering temperatures remains to be of hexagonal type but peaks of Er2O3 are prominent. Small peaks of new phases Mn2O3 and ZnMnO3 are observed in the XRD pattern. Microstructure, compositional analysis of the selected areas is observed by SEM and EDAX. The clusters of Er2O3 are observed at nodal points. Density increases from 87.2 to 91.9 % and 80.6 to 88.7 % of the theoretical density (5.78 g/cm3) of pure ZnO at sintering temperatures 1200 and 1300 ⁰C, respectively, with the increase of Er2O3 mol%. Universiti Putra Malaysia Press 2005 Conference or Workshop Item NonPeerReviewed application/pdf en http://psasir.upm.edu.my/id/eprint/38672/1/38672.pdf Zakaria, Azmi and Rizwan, Zahid and Hashim, Mansor and Shaari, Abdul Halim and Mat Yunus, Wan Mahmood (2005) Photothermal study of doped ZnO ceramics. In: International Advanced Technology Congress: Conference on Advanced Materials (CAM 2005), 6-8 Dec. 2005, Putrajaya, Malaysia. (pp. 269-274). |
| repository_type |
Digital Repository |
| institution_category |
Local University |
| institution |
Universiti Putra Malaysia |
| building |
UPM Institutional Repository |
| collection |
Online Access |
| language |
English |
| description |
Photopyroelectric spectroscopy (PPES) is used to study the band-gap energy, Eg, of ZnO doped with 1 mol% MnO and 0 – 2.0 mol% of Er2O3 sintered at isothermal sintering temperatures, 1200 and 1300⁰C. The wavelength of incident light is kept in the range from 300 to 800 nm and the PPE spectrum with reference to the doping level and sintering temperature is discussed. Eg were estimated from the plot (ρhυ)2 vs hυ and the values are 2.12, 2.09 eV for the samples sintered at 1300 ⁰C, 1200 ⁰C, respectively, for 0 mol% of Er2O3 doping level. Eg becomes constant with the fluctuation about 1.8 % at all doping levels of Er2O3 mol% indicating that the interfacial states are not produced further in MnO-ZnO ceramics by Er2O3 mol%. The decrease in steepness factor is related to sintering temperature and Er2O3 mol%. The X-ray diffractrometry shows that the crystal structure of ZnO doped with 1 mol% of MnO and different mol% of Er2O3 at all sintering temperatures remains to be of hexagonal type but peaks of Er2O3 are prominent. Small peaks of new phases Mn2O3 and ZnMnO3 are observed in the XRD pattern. Microstructure, compositional analysis of the selected areas is observed by SEM and EDAX. The clusters of Er2O3 are observed at nodal points. Density increases from 87.2 to 91.9 % and 80.6 to 88.7 % of the theoretical density (5.78 g/cm3) of pure ZnO at sintering temperatures 1200 and 1300 ⁰C, respectively, with the increase of Er2O3 mol%. |
| format |
Conference or Workshop Item |
| author |
Zakaria, Azmi Rizwan, Zahid Hashim, Mansor Shaari, Abdul Halim Mat Yunus, Wan Mahmood |
| spellingShingle |
Zakaria, Azmi Rizwan, Zahid Hashim, Mansor Shaari, Abdul Halim Mat Yunus, Wan Mahmood Photothermal study of doped ZnO ceramics |
| author_facet |
Zakaria, Azmi Rizwan, Zahid Hashim, Mansor Shaari, Abdul Halim Mat Yunus, Wan Mahmood |
| author_sort |
Zakaria, Azmi |
| title |
Photothermal study of doped ZnO ceramics |
| title_short |
Photothermal study of doped ZnO ceramics |
| title_full |
Photothermal study of doped ZnO ceramics |
| title_fullStr |
Photothermal study of doped ZnO ceramics |
| title_full_unstemmed |
Photothermal study of doped ZnO ceramics |
| title_sort |
photothermal study of doped zno ceramics |
| publisher |
Universiti Putra Malaysia Press |
| publishDate |
2005 |
| url |
http://psasir.upm.edu.my/id/eprint/38672/ http://psasir.upm.edu.my/id/eprint/38672/1/38672.pdf |
| first_indexed |
2018-09-07T16:45:09Z |
| last_indexed |
2018-09-07T16:45:09Z |
| _version_ |
1610967898930544640 |