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High Dielectric Constant and Dielectric Relaxations in La(2/3)Cu(3)Ti(4)O(12) Ceramics
La(2/3)Cu(3)Ti(4)O(12) ceramics were prepared by the same method of solid-state reaction as CaCu(3)Ti(4)O(12) ceramics. The structure and dielectric responses for La(2/3)Cu(3)Ti(4)O(12) and CaCu(3)Ti(4)O(12) ceramics were systematically investigated by X-ray diffraction, scanning electron microscope...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
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MDPI
2022
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9267635/ https://www.ncbi.nlm.nih.gov/pubmed/35806652 http://dx.doi.org/10.3390/ma15134526 |
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author | Ni, Lei Zhang, Chuyi Fang, Lu |
author_facet | Ni, Lei Zhang, Chuyi Fang, Lu |
author_sort | Ni, Lei |
collection | PubMed |
description | La(2/3)Cu(3)Ti(4)O(12) ceramics were prepared by the same method of solid-state reaction as CaCu(3)Ti(4)O(12) ceramics. The structure and dielectric responses for La(2/3)Cu(3)Ti(4)O(12) and CaCu(3)Ti(4)O(12) ceramics were systematically investigated by X-ray diffraction, scanning electron microscope, X-ray photoelectron spectroscopy, and impedance analyzer. Compared with CaCu(3)Ti(4)O(12) ceramics, La(2/3)Cu(3)Ti(4)O(12) ceramics with higher density and refined grain exhibit a high dielectric constant (ε′ ~ 10(4)) and two dielectric relaxations in a wide temperature range. The dielectric relaxation below 200 K with an activation energy of 0.087 eV in La(2/3)Cu(3)Ti(4)O(12) ceramics is due to the polyvalent state of Ti(3+)/Ti(4+) and Cu(+)/Cu(2+), while the dielectric relaxation above 450 K with higher activation energy (0.596 eV) is due to grain boundary effects. These thermal activated dielectric relaxations with lower activation energy in La(2/3)Cu(3)Ti(4)O(12) ceramics both move to lower temperatures, which can be associated with the enhanced polyvalent structure in La(2/3)Cu(3)Ti(4)O(12) ceramics. Such high dielectric constant ceramics are also expected to be applied in capacitors and memory devices. |
format | Online Article Text |
id | pubmed-9267635 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-92676352022-07-09 High Dielectric Constant and Dielectric Relaxations in La(2/3)Cu(3)Ti(4)O(12) Ceramics Ni, Lei Zhang, Chuyi Fang, Lu Materials (Basel) Article La(2/3)Cu(3)Ti(4)O(12) ceramics were prepared by the same method of solid-state reaction as CaCu(3)Ti(4)O(12) ceramics. The structure and dielectric responses for La(2/3)Cu(3)Ti(4)O(12) and CaCu(3)Ti(4)O(12) ceramics were systematically investigated by X-ray diffraction, scanning electron microscope, X-ray photoelectron spectroscopy, and impedance analyzer. Compared with CaCu(3)Ti(4)O(12) ceramics, La(2/3)Cu(3)Ti(4)O(12) ceramics with higher density and refined grain exhibit a high dielectric constant (ε′ ~ 10(4)) and two dielectric relaxations in a wide temperature range. The dielectric relaxation below 200 K with an activation energy of 0.087 eV in La(2/3)Cu(3)Ti(4)O(12) ceramics is due to the polyvalent state of Ti(3+)/Ti(4+) and Cu(+)/Cu(2+), while the dielectric relaxation above 450 K with higher activation energy (0.596 eV) is due to grain boundary effects. These thermal activated dielectric relaxations with lower activation energy in La(2/3)Cu(3)Ti(4)O(12) ceramics both move to lower temperatures, which can be associated with the enhanced polyvalent structure in La(2/3)Cu(3)Ti(4)O(12) ceramics. Such high dielectric constant ceramics are also expected to be applied in capacitors and memory devices. MDPI 2022-06-27 /pmc/articles/PMC9267635/ /pubmed/35806652 http://dx.doi.org/10.3390/ma15134526 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Ni, Lei Zhang, Chuyi Fang, Lu High Dielectric Constant and Dielectric Relaxations in La(2/3)Cu(3)Ti(4)O(12) Ceramics |
title | High Dielectric Constant and Dielectric Relaxations in La(2/3)Cu(3)Ti(4)O(12) Ceramics |
title_full | High Dielectric Constant and Dielectric Relaxations in La(2/3)Cu(3)Ti(4)O(12) Ceramics |
title_fullStr | High Dielectric Constant and Dielectric Relaxations in La(2/3)Cu(3)Ti(4)O(12) Ceramics |
title_full_unstemmed | High Dielectric Constant and Dielectric Relaxations in La(2/3)Cu(3)Ti(4)O(12) Ceramics |
title_short | High Dielectric Constant and Dielectric Relaxations in La(2/3)Cu(3)Ti(4)O(12) Ceramics |
title_sort | high dielectric constant and dielectric relaxations in la(2/3)cu(3)ti(4)o(12) ceramics |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9267635/ https://www.ncbi.nlm.nih.gov/pubmed/35806652 http://dx.doi.org/10.3390/ma15134526 |
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