Improved dielectric properties of Na1/2Y1/2Cu3Ti4O12 ceramics synthesized by ball-milling and reactive sintering
Na _1/2 Y _1/2 Cu _3 Ti _4 O _12 (NYCTO) ceramics with giant dielectric constant ( ε ′) were synthesized by simple reactive sintering. NYCTO nanopowder was first synthesized using high energy ball-mill. Then the pelletized powder was sintered in air at temperatures in the range 975 °C to 1050 °C for...
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| Format: | Article |
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IOP Publishing
2020-01-01
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| Series: | Materials Research Express |
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| Online Access: | https://doi.org/10.1088/2053-1591/ab73fb |
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| author | H Mahfoz Kotb Mohamad M Ahmad Adil Alshoaibi Hassan A Khater Abdullah Aljaafari |
| author_facet | H Mahfoz Kotb Mohamad M Ahmad Adil Alshoaibi Hassan A Khater Abdullah Aljaafari |
| author_sort | H Mahfoz Kotb |
| collection | DOAJ |
| description | Na _1/2 Y _1/2 Cu _3 Ti _4 O _12 (NYCTO) ceramics with giant dielectric constant ( ε ′) were synthesized by simple reactive sintering. NYCTO nanopowder was first synthesized using high energy ball-mill. Then the pelletized powder was sintered in air at temperatures in the range 975 °C to 1050 °C for 10–20 h. The obtained ceramics showed pure CaCu _3 Ti _4 O _12 (CCTO)-like cubic phase as revealed by x-ray diffraction measurements. Field effect-SEM observations showed that the grain size increases from 2 μ m to 5 μ m with increasing sintering temperature. NYCTO samples sintered at temperatures higher than 975 °C showed giant dielectric constant (10 ^3 –10 ^4 ) over most of the frequency range. The minimum dielectric loss (tan δ ) of ∼0.055 at 300 K has been approved for the ceramic sample sintered at 1050 °C. Impedance and modulus spectra of the current samples showed two relaxations related to semiconductor (grain) and high resistance (grain-boundaries) elements. The activation energy for conduction located in the range 0.1–0.5 eV highlighted the role of single ionized oxygen vacancies in the dielectric properties of the investigated NYCTO ceramics. |
| first_indexed | 2024-03-12T15:38:37Z |
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| id | doaj.art-c6d59f0dde01489f8fa2d54492f2ece7 |
| institution | Directory Open Access Journal |
| issn | 2053-1591 |
| language | English |
| last_indexed | 2024-03-12T15:38:37Z |
| publishDate | 2020-01-01 |
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| spelling | doaj.art-c6d59f0dde01489f8fa2d54492f2ece72023-08-09T16:06:55ZengIOP PublishingMaterials Research Express2053-15912020-01-017202655010.1088/2053-1591/ab73fbImproved dielectric properties of Na1/2Y1/2Cu3Ti4O12 ceramics synthesized by ball-milling and reactive sinteringH Mahfoz Kotb0https://orcid.org/0000-0001-6437-8131Mohamad M Ahmad1https://orcid.org/0000-0002-4634-3266Adil Alshoaibi2https://orcid.org/0000-0002-9548-6503Hassan A Khater3https://orcid.org/0000-0002-0906-1825Abdullah Aljaafari4https://orcid.org/0000-0001-7742-6665Department of Physics, College of Science, King Faisal University , Al-Ahsa 31982, Saudi Arabia; Physics Department, Faculty of Science, Assiut University , Assiut 71516, EgyptDepartment of Physics, College of Science, King Faisal University , Al-Ahsa 31982, Saudi Arabia; Department of Physics, Faculty of Science, The New Valley University , El-Kharga 72511, EgyptDepartment of Physics, College of Science, King Faisal University , Al-Ahsa 31982, Saudi ArabiaDepartment of Physics, College of Science, King Faisal University , Al-Ahsa 31982, Saudi Arabia; Physics Department, Faculty of Science, Assiut University , Assiut 71516, EgyptDepartment of Physics, College of Science, King Faisal University , Al-Ahsa 31982, Saudi ArabiaNa _1/2 Y _1/2 Cu _3 Ti _4 O _12 (NYCTO) ceramics with giant dielectric constant ( ε ′) were synthesized by simple reactive sintering. NYCTO nanopowder was first synthesized using high energy ball-mill. Then the pelletized powder was sintered in air at temperatures in the range 975 °C to 1050 °C for 10–20 h. The obtained ceramics showed pure CaCu _3 Ti _4 O _12 (CCTO)-like cubic phase as revealed by x-ray diffraction measurements. Field effect-SEM observations showed that the grain size increases from 2 μ m to 5 μ m with increasing sintering temperature. NYCTO samples sintered at temperatures higher than 975 °C showed giant dielectric constant (10 ^3 –10 ^4 ) over most of the frequency range. The minimum dielectric loss (tan δ ) of ∼0.055 at 300 K has been approved for the ceramic sample sintered at 1050 °C. Impedance and modulus spectra of the current samples showed two relaxations related to semiconductor (grain) and high resistance (grain-boundaries) elements. The activation energy for conduction located in the range 0.1–0.5 eV highlighted the role of single ionized oxygen vacancies in the dielectric properties of the investigated NYCTO ceramics.https://doi.org/10.1088/2053-1591/ab73fbmillingsinteringdielectric propertiesimpedance |
| spellingShingle | H Mahfoz Kotb Mohamad M Ahmad Adil Alshoaibi Hassan A Khater Abdullah Aljaafari Improved dielectric properties of Na1/2Y1/2Cu3Ti4O12 ceramics synthesized by ball-milling and reactive sintering Materials Research Express milling sintering dielectric properties impedance |
| title | Improved dielectric properties of Na1/2Y1/2Cu3Ti4O12 ceramics synthesized by ball-milling and reactive sintering |
| title_full | Improved dielectric properties of Na1/2Y1/2Cu3Ti4O12 ceramics synthesized by ball-milling and reactive sintering |
| title_fullStr | Improved dielectric properties of Na1/2Y1/2Cu3Ti4O12 ceramics synthesized by ball-milling and reactive sintering |
| title_full_unstemmed | Improved dielectric properties of Na1/2Y1/2Cu3Ti4O12 ceramics synthesized by ball-milling and reactive sintering |
| title_short | Improved dielectric properties of Na1/2Y1/2Cu3Ti4O12 ceramics synthesized by ball-milling and reactive sintering |
| title_sort | improved dielectric properties of na1 2y1 2cu3ti4o12 ceramics synthesized by ball milling and reactive sintering |
| topic | milling sintering dielectric properties impedance |
| url | https://doi.org/10.1088/2053-1591/ab73fb |
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