Enhanced Tunability Achieving at Low Permittivity and Electric Field in (Ba<sub>0.91</sub>Ca<sub>0.09</sub>)(Sn<sub>x</sub>Zr<sub>0.2</sub><sub>−</sub><sub>x</sub>Ti<sub>0.8</sub>)O<sub>3</sub>-2 mol% CuO-1 mol% Li<sub>2</sub>CO<sub>3</sub> Ceramics
Ferroelectric varactors should have high tunability at low permittivity and a working electric field to obtain better impedance matching and stable tunability. In this work, (Ba<sub>0.91</sub>Ca<sub>0.09</sub>)(Sn<sub>x</sub>Zr<sub>0.2−x</sub>Ti<sub...
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2023-07-01
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| Online Access: | https://www.mdpi.com/1996-1944/16/15/5226 |
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| author | Bo Wang Le Zhao Xiuhuai Jia Pan Yang Shihui Yu |
| author_facet | Bo Wang Le Zhao Xiuhuai Jia Pan Yang Shihui Yu |
| author_sort | Bo Wang |
| collection | DOAJ |
| description | Ferroelectric varactors should have high tunability at low permittivity and a working electric field to obtain better impedance matching and stable tunability. In this work, (Ba<sub>0.91</sub>Ca<sub>0.09</sub>)(Sn<sub>x</sub>Zr<sub>0.2−x</sub>Ti<sub>0.8</sub>)O<sub>3</sub>-2 mol% CuO-1 mol% Li<sub>2</sub>CO<sub>3</sub> (abbreviated as BCSZT100x, x = 0.05, 0.10, 0.15 and 0.20, respectively) are prepared to achieve high tunability at low permittivity and a working electric field. The tunable mechanisms are investigated based on crystal structure, micro-morphology and the permittivity-temperature spectrum. The results show that the shrink of oxygen octahedron and weaker interaction force between Sn<sup>4+</sup> and O<sup>2−</sup> make BCSZT5 ceramic have a higher tunability value of 26.55% at low permittivity (1913) and a working electric field (7.3 kV/cm). The tunability value of BCSZT5 ceramic increases by 58%, while its permittivity decreases by 25%, compared with x = 0. Those advantages make BCSZT5 ceramic have substantial application prospects in varactors. |
| first_indexed | 2024-03-11T00:23:54Z |
| format | Article |
| id | doaj.art-e05de796153243468b6269f793d97a13 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-11T00:23:54Z |
| publishDate | 2023-07-01 |
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| spelling | doaj.art-e05de796153243468b6269f793d97a132023-11-18T23:10:29ZengMDPI AGMaterials1996-19442023-07-011615522610.3390/ma16155226Enhanced Tunability Achieving at Low Permittivity and Electric Field in (Ba<sub>0.91</sub>Ca<sub>0.09</sub>)(Sn<sub>x</sub>Zr<sub>0.2</sub><sub>−</sub><sub>x</sub>Ti<sub>0.8</sub>)O<sub>3</sub>-2 mol% CuO-1 mol% Li<sub>2</sub>CO<sub>3</sub> CeramicsBo Wang0Le Zhao1Xiuhuai Jia2Pan Yang3Shihui Yu4Department of Electrical Engineering and Automation, Luoyang Institute of Science and Technology, Luoyang 471023, ChinaSchool of Microelectronics, Tianjin University, Tianjin 300072, ChinaSchool of Microelectronics, Tianjin University, Tianjin 300072, ChinaDepartment of Electrical Engineering and Automation, Luoyang Institute of Science and Technology, Luoyang 471023, ChinaDepartment of Electrical Engineering and Automation, Luoyang Institute of Science and Technology, Luoyang 471023, ChinaFerroelectric varactors should have high tunability at low permittivity and a working electric field to obtain better impedance matching and stable tunability. In this work, (Ba<sub>0.91</sub>Ca<sub>0.09</sub>)(Sn<sub>x</sub>Zr<sub>0.2−x</sub>Ti<sub>0.8</sub>)O<sub>3</sub>-2 mol% CuO-1 mol% Li<sub>2</sub>CO<sub>3</sub> (abbreviated as BCSZT100x, x = 0.05, 0.10, 0.15 and 0.20, respectively) are prepared to achieve high tunability at low permittivity and a working electric field. The tunable mechanisms are investigated based on crystal structure, micro-morphology and the permittivity-temperature spectrum. The results show that the shrink of oxygen octahedron and weaker interaction force between Sn<sup>4+</sup> and O<sup>2−</sup> make BCSZT5 ceramic have a higher tunability value of 26.55% at low permittivity (1913) and a working electric field (7.3 kV/cm). The tunability value of BCSZT5 ceramic increases by 58%, while its permittivity decreases by 25%, compared with x = 0. Those advantages make BCSZT5 ceramic have substantial application prospects in varactors.https://www.mdpi.com/1996-1944/16/15/5226ferroelectric varactorspermittivityimpedance matchingoxygen octahedron |
| spellingShingle | Bo Wang Le Zhao Xiuhuai Jia Pan Yang Shihui Yu Enhanced Tunability Achieving at Low Permittivity and Electric Field in (Ba<sub>0.91</sub>Ca<sub>0.09</sub>)(Sn<sub>x</sub>Zr<sub>0.2</sub><sub>−</sub><sub>x</sub>Ti<sub>0.8</sub>)O<sub>3</sub>-2 mol% CuO-1 mol% Li<sub>2</sub>CO<sub>3</sub> Ceramics Materials ferroelectric varactors permittivity impedance matching oxygen octahedron |
| title | Enhanced Tunability Achieving at Low Permittivity and Electric Field in (Ba<sub>0.91</sub>Ca<sub>0.09</sub>)(Sn<sub>x</sub>Zr<sub>0.2</sub><sub>−</sub><sub>x</sub>Ti<sub>0.8</sub>)O<sub>3</sub>-2 mol% CuO-1 mol% Li<sub>2</sub>CO<sub>3</sub> Ceramics |
| title_full | Enhanced Tunability Achieving at Low Permittivity and Electric Field in (Ba<sub>0.91</sub>Ca<sub>0.09</sub>)(Sn<sub>x</sub>Zr<sub>0.2</sub><sub>−</sub><sub>x</sub>Ti<sub>0.8</sub>)O<sub>3</sub>-2 mol% CuO-1 mol% Li<sub>2</sub>CO<sub>3</sub> Ceramics |
| title_fullStr | Enhanced Tunability Achieving at Low Permittivity and Electric Field in (Ba<sub>0.91</sub>Ca<sub>0.09</sub>)(Sn<sub>x</sub>Zr<sub>0.2</sub><sub>−</sub><sub>x</sub>Ti<sub>0.8</sub>)O<sub>3</sub>-2 mol% CuO-1 mol% Li<sub>2</sub>CO<sub>3</sub> Ceramics |
| title_full_unstemmed | Enhanced Tunability Achieving at Low Permittivity and Electric Field in (Ba<sub>0.91</sub>Ca<sub>0.09</sub>)(Sn<sub>x</sub>Zr<sub>0.2</sub><sub>−</sub><sub>x</sub>Ti<sub>0.8</sub>)O<sub>3</sub>-2 mol% CuO-1 mol% Li<sub>2</sub>CO<sub>3</sub> Ceramics |
| title_short | Enhanced Tunability Achieving at Low Permittivity and Electric Field in (Ba<sub>0.91</sub>Ca<sub>0.09</sub>)(Sn<sub>x</sub>Zr<sub>0.2</sub><sub>−</sub><sub>x</sub>Ti<sub>0.8</sub>)O<sub>3</sub>-2 mol% CuO-1 mol% Li<sub>2</sub>CO<sub>3</sub> Ceramics |
| title_sort | enhanced tunability achieving at low permittivity and electric field in ba sub 0 91 sub ca sub 0 09 sub sn sub x sub zr sub 0 2 sub sub sub sub x sub ti sub 0 8 sub o sub 3 sub 2 mol cuo 1 mol li sub 2 sub co sub 3 sub ceramics |
| topic | ferroelectric varactors permittivity impedance matching oxygen octahedron |
| url | https://www.mdpi.com/1996-1944/16/15/5226 |
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