Photothermal study of doped ZnO ceramics by Zakaria, Azmi, Rizwan, Zahid, Hashim, Mansor, Shaari, Abdul Halim, Mat Yunus, Wan Mahmood

“…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%. …”
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Photopyroelectric spectroscopy of Sb2O3 - ZnO ceramics by Zakaria, Azmi, Rizwan, Zahid, Hashim, Mansor, Shaari, Abdul Halim, Mat Yunus, Wan Mahmood

“…Photopyroelectric spectroscopy is used to study the band-gap energy of the ceramic (ZnO + xSb2O3), x = 0.1 - 1.5 mol% and the ceramic (ZnO + 0.4 mol%  Bi2O3 + xSb2O3), x = 0 - 1.5 mol% sintered at isothermal temperature, 1280 °C, for 1 and 2 hours. …”
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Application of direct current and temperature stresses of low-voltage ZnO based varistor ceramics by Mohd Ghazali, Mohd Sabri, Zakaria, Azmi, Rizwan, Zahid, Mohamed Kamari, Halimah, Hashim, Mansor, Abd. Aziz, Sidek

“…The current-voltage characteristics of the varistor ceramics were evaluated. Results: The α of ceramic was observed to be decreased with increasing sintering temperature. …”
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Determination of the energy band-gap of the ceramic ZnO -xTiO₂ using photopyroelectric spectroscopy by Zakaria, Azmi, Rizwan, Zahid, Mohd Ghazali, Mohd Sabri, Shaari, Abdul Halim, Mat Yunus, Wan Mahmood, Hashim, Mansor

“…Photopyroelectric (PPE) spectroscopy is a useful tool for examining optical properties in semiconductor materials. The ceramic (ZnO - xTiO₂) was sintered at 1270⁰C for 1 and 3 hours to investigate the variations of energy band-gap with respect to mol % of dopant TiO₂. …”
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Microstructural and nonlinear electrical properties of ZnO ceramics with small amount of MnO2 dopant by Adnin, Noorfauzana, Zakaria, Azmi, Mohd Ghazali, Mohd Sabri, Wan Abdullah, Wan Rafizah, Hashim, Mansor

“…A small amount of MnO2 dopant was added to ZnO system to see the improvement of the ceramic varistor microstructural and nonlinear electrical properties. …”
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Effect of MnO2 doping on nonlinear coefficeint of Zn-Bi-Ti-O varistor ceramics by Mohd Ghazali, Mohd Sabri, Wan Abdullah, Wan Rafizah, Zakaria, Azmi, Rizwan, Zahid, Matori, Khamirul Amin, Mohd Zaid, Mohd Hafiz

“…The density of varistor ceramics was measured by the geometrical method. The current-voltage characteristics of the varistor ceramics were evaluated. …”
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Preliminary characteristic of electrical non-linearity Co doped CMO-ZnO based varistor ceramic by Zulkifli, Muhamad Azman, Mohd Ghazali, Mohd Sabri, Wan Abdullah, Wan Rafizah, Zakaria, Azmi, Ahmad, Zakiyah

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Effect of heat treatment on the optical properties of ceramic ZnO-MnO-Dy2O3. by Rizwan, Zahid, Zakaria, Azmi, Sabri, M.G.M.

“…Ceramics were sintered at 1200 and 1300°C for 1 and 5 h. …”
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Effect of Co3O4 doping on nonlinear coefficient in Zn-Bi-Ti-O varistor ceramics by Mohd Ghazali, Mohd Sabri, Zakaria, Azmi, Wan Abdullah, Wan Rafizah, Mohd Zaid, Mohd Hafiz, Matori, Khamirul Amin

“…The density of varistor ceramics was measured by the geometrical method. The current-voltage characteristics of the varistor ceramics were evaluated. …”
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Doping small amount of MnO2 in ZnO-MnO2 based varistor ceramics by Adnin, Noorfauzana, Zakaria, Azmi, Mohd Ghazali, Mohd Sabri, Suhat, Ahmad Warid, Hashim, Mansor

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Microstructure and nonlinear properties of Zn-V-Mn-Nb-O varistor ceramics with Nd2O3 substitution by Azis, Raba'ah Syahidah, Zakaria, Azmi, Abdullah, W. R. W., Isa, N. H.

“…An abnormal grain growth of the ZnO-based ceramics due to highly reactive vanadium liquid phase disrupts its nonlinear properties. …”
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Optical characterization of the Bi2O3, TiO2 and MnO2 doped ZnO ceramics. by Rizwan , Zahid, Zakaria, Azmi, Sabri, M.G.M., Ahmad, Fashi ud din

“…Photopyroelectric (PPE) spectroscopy was used to study the optical band-gap energy (Eg) of the ceramic ZnO doped with 0.5MnO2. xBi2O3 and xTiO2 sintered at 1270oC for one to four hours. …”
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Effect of temperature treatment on the optical characterization of ZnO-Bi2O3-TiO2 varistor ceramics. by Sabri, M.G.M., Zakaria, Azmi, Rizwan, Zahid, Mohamed Kamari, Halimah, Hashim, Mansor, Zaid, M.H.M.

“…Eg of the ceramic ZnO + xBi2O3 + xTiO2 where x = 0.5 mol%, was determined using UV-Vis spectrophotometer. …”

Stability of ZnO-Pr6o11-Cr2O3 varistor ceramics against electrical degradation by Wan Abdullah, Wan Rafizah, Zakaria, Azmi, Hashim, Mansor, Rahman, Md. Mahmudur, Mohd Ghazali, Mohd Sabri

“…In this study, ZnO-Pr6O11-Cr2O3 varistor ceramics were prepared through modified citrate gel method and solid state-sintering at 1250 °C for 1 hour. …”
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Photopyroelectric spectrum of MNO2 Doped Bi2O3 - TiO2 - ZnO ceramic combination by Rizwan, Zahid, Zakaria, Azmi, Mat Yunus, Wan Mahmood, Hashim, Mansor, Shaari, Abdul Halim

“…Photopyroelectric spectroscopy is used to study the energy band-gap of the ceramic (ZnO 0.25 Bi2O3 +0.25 TiO2 + x MnO2), x = 0 - 1.3 mol%, sintered at isothermal temperature 1190 and 1270°C for 2 hours in air. …”
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Use of a reflectance spectroscopy accessory for optical characterization of ZnO-Bi2O3-TiO2 ceramics. by Mohd Ghazali, Mohd Sabri, Zakaria, Azmi, Rizwan, Zahid, Mohamed Kamari, Halimah, Hashim, Mansor, Mohd Zaid, Mohd Hafiz, Zamiri, Reza

“…Therefore, it is necessary to investigate the electronic states of ceramic ZnO and the effect of doped impurities under different processing conditions. …”
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Synthesis mechanism of low-voltage Praseodymium oxide doped zinc oxide varistor ceramics prepared through modified citrate gel coating. by Wan Abdullah, Wan Rafizah, Zakaria, Azmi, Mohd Ghazali, Mohd Sabri

“…Precursor powder and its ceramics were examined by means of TG/DTG, FTIR, XRD and FESEM analyses. …”
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Photopyroelectric spectroscopic studies of ZnO-MnO2-Co3O4-V2O5 ceramics by Rizwan, Zahid, Zakaria, Azmi, Mohd Ghazali, Mohd Sabri

“…Photopyroelectric (PPE) spectroscopy is a nondestructive tool that is used to study the optical properties of the ceramics (ZnO + 0.4MnO2 + 0.4Co3O4 + xV2O5), x = 0–1 mol%. …”
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The effect of sintering time on the microstructural and nonlinear electrical properties of Zn-V-Mn-Nb-Gd-O low-voltage varistor ceramics by Isa, Nor Hasanah, Azis, Raba'ah Syahidah, Saat, Nor Kamilah, Zakaria, Azmi, Mohammadi, Raheleh, Kinsu, Rosno

“…There is lacking of study on the prolonged sintering time effect on the microstructural and nonlinear electrical properties of ZnO-V2O5-MnO2-Nb2O5-Gd2O3-based low-voltage varistor ceramics sintered at 900 °C. The aim of this study is to investigate the effect of sintering time from 120 to 210 mins on the microstructural and nonlinear electrical properties of the ceramics. …”
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Photopyro-electric spectroscopic studies of ZnO-MnO2-Co3O4-V2O5 ceramics. by Zakaria, Azmi, Rizwan, Zahid, Mohd Ghazali, Mohd Sabri

“…Photopyroelectric (PPE) spectroscopy is a nondestructive tool that is used to study the optical properties of the ceramics (ZnO + 0.4MnO2 + 0.4Co3O4 + xV2O5), x = 0–1 mol%. …”
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