Dielectric and electrical characteristics of mechanically synthesized Ni-Zn ferrite nanoparticles
Ni-Zn ferrite nanoparticles were synthesized via mechanical activation of Zn, NiO and Fe2O3 powders in a high energy planetary ball mill. The 30 h-milled samples in argon, oxygen and air atmospheres were pressed in pellet and toroid shape form and were sintered from 500 °C to 900 °C with 100 °C incr...
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| Format: | Article |
| Language: | English |
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Elsevier
2017
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| Online Access: | http://psasir.upm.edu.my/id/eprint/61469/1/Dielectric%20and%20electrical%20characteristics%20of%20mechanically%20synthesized%20Ni-Zn%20ferrite%20nanoparticles.pdf |
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| author | Hajalilou, Abdollah Mohamed Kamari, Halimah Shameli, Kamyar |
| author_facet | Hajalilou, Abdollah Mohamed Kamari, Halimah Shameli, Kamyar |
| author_sort | Hajalilou, Abdollah |
| collection | UPM |
| description | Ni-Zn ferrite nanoparticles were synthesized via mechanical activation of Zn, NiO and Fe2O3 powders in a high energy planetary ball mill. The 30 h-milled samples in argon, oxygen and air atmospheres were pressed in pellet and toroid shape form and were sintered from 500 °C to 900 °C with 100 °C increments. The X-ray diffraction patterns results indicated a single phase Ni-Zn ferrite formation with a cubic-spinel structure in all the samples sintered at 500 °C. The milling atmosphere had a key role in the synthesis, microstructure and properties of the samples in such a way that this effect sustained even after the completion of sintering process. Thus, the main goal of this study is to scrutinize the effect of sintering temperature in the 30-h-milled samples in different atmospheres on DC electrical resistivity and dielectric behavior of Ni-Zn ferrite samples. The results indicated that although electrical resistivity decreased, dielectric behaviors, i.e. constant, loss and tan increased with increase in sintering temperature. The milled samples in argon had the highest resistivity of 1.2 106 Ωcm at 500 °C, and lowest dielectric constant and loss (4.67 102 and 1.7 at 300 K and frequency 106 MHz, respectively) compared to other samples owing to more homogeneity and smaller average crystallite size, making them a good candidate for high frequency applications. X-ray photoelectron spectroscopy (XPS) revealed the presence of metal ions in their proper valence in the Ni-Zn ferrite crystal structure. Noticeably, a variation in the binding energy for the milled samples in different atmospheres is attributed to the changes in surroundings of Fe3+ and Zn2+/or Ni2+, due to non-equilibrium distribution of cations in tetrahedral and octahedral sites, which is further confirmed by the XRD patterns. |
| first_indexed | 2024-03-06T09:40:34Z |
| format | Article |
| id | upm.eprints-61469 |
| institution | Universiti Putra Malaysia |
| language | English |
| last_indexed | 2024-03-06T09:40:34Z |
| publishDate | 2017 |
| publisher | Elsevier |
| record_format | dspace |
| spelling | upm.eprints-614692018-05-28T01:16:23Z http://psasir.upm.edu.my/id/eprint/61469/ Dielectric and electrical characteristics of mechanically synthesized Ni-Zn ferrite nanoparticles Hajalilou, Abdollah Mohamed Kamari, Halimah Shameli, Kamyar Ni-Zn ferrite nanoparticles were synthesized via mechanical activation of Zn, NiO and Fe2O3 powders in a high energy planetary ball mill. The 30 h-milled samples in argon, oxygen and air atmospheres were pressed in pellet and toroid shape form and were sintered from 500 °C to 900 °C with 100 °C increments. The X-ray diffraction patterns results indicated a single phase Ni-Zn ferrite formation with a cubic-spinel structure in all the samples sintered at 500 °C. The milling atmosphere had a key role in the synthesis, microstructure and properties of the samples in such a way that this effect sustained even after the completion of sintering process. Thus, the main goal of this study is to scrutinize the effect of sintering temperature in the 30-h-milled samples in different atmospheres on DC electrical resistivity and dielectric behavior of Ni-Zn ferrite samples. The results indicated that although electrical resistivity decreased, dielectric behaviors, i.e. constant, loss and tan increased with increase in sintering temperature. The milled samples in argon had the highest resistivity of 1.2 106 Ωcm at 500 °C, and lowest dielectric constant and loss (4.67 102 and 1.7 at 300 K and frequency 106 MHz, respectively) compared to other samples owing to more homogeneity and smaller average crystallite size, making them a good candidate for high frequency applications. X-ray photoelectron spectroscopy (XPS) revealed the presence of metal ions in their proper valence in the Ni-Zn ferrite crystal structure. Noticeably, a variation in the binding energy for the milled samples in different atmospheres is attributed to the changes in surroundings of Fe3+ and Zn2+/or Ni2+, due to non-equilibrium distribution of cations in tetrahedral and octahedral sites, which is further confirmed by the XRD patterns. Elsevier 2017-06 Article PeerReviewed text en http://psasir.upm.edu.my/id/eprint/61469/1/Dielectric%20and%20electrical%20characteristics%20of%20mechanically%20synthesized%20Ni-Zn%20ferrite%20nanoparticles.pdf Hajalilou, Abdollah and Mohamed Kamari, Halimah and Shameli, Kamyar (2017) Dielectric and electrical characteristics of mechanically synthesized Ni-Zn ferrite nanoparticles. Journal of Alloys and Compounds, 708. 813 - 826. ISSN 0925-8388; ESSN: 1873-4669 https://www.sciencedirect.com/science/article/pii/S0925838817307995 10.1016/j.jallcom.2017.03.030 |
| spellingShingle | Hajalilou, Abdollah Mohamed Kamari, Halimah Shameli, Kamyar Dielectric and electrical characteristics of mechanically synthesized Ni-Zn ferrite nanoparticles |
| title | Dielectric and electrical characteristics of mechanically synthesized Ni-Zn ferrite nanoparticles |
| title_full | Dielectric and electrical characteristics of mechanically synthesized Ni-Zn ferrite nanoparticles |
| title_fullStr | Dielectric and electrical characteristics of mechanically synthesized Ni-Zn ferrite nanoparticles |
| title_full_unstemmed | Dielectric and electrical characteristics of mechanically synthesized Ni-Zn ferrite nanoparticles |
| title_short | Dielectric and electrical characteristics of mechanically synthesized Ni-Zn ferrite nanoparticles |
| title_sort | dielectric and electrical characteristics of mechanically synthesized ni zn ferrite nanoparticles |
| url | http://psasir.upm.edu.my/id/eprint/61469/1/Dielectric%20and%20electrical%20characteristics%20of%20mechanically%20synthesized%20Ni-Zn%20ferrite%20nanoparticles.pdf |
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