Phase Structures and Dielectric Properties of (<i>n</i> + 1)SrO − <i>n</i>CeO<sub>2</sub> (<i>n</i> = 2) Microwave Ceramic Systems with TiO<sub>2</sub> Addition
Ti<sup>4+</sup>-ion-doped (<i>n</i> + 1)SrO − <i>n</i>CeO<sub>2</sub> (<i>n</i> = 2) ceramic systems were prepared with the conventional solid-state reaction method, and the effects of the phase structures and compositions, sintering behavi...
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MDPI AG
2023-06-01
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| Series: | Crystals |
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| Online Access: | https://www.mdpi.com/2073-4352/13/6/955 |
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| author | Qi Su Jingjing Qu Fei Liu Changlai Yuan Xiao Liu Mingwei Su Liufang Meng Guohua Chen |
| author_facet | Qi Su Jingjing Qu Fei Liu Changlai Yuan Xiao Liu Mingwei Su Liufang Meng Guohua Chen |
| author_sort | Qi Su |
| collection | DOAJ |
| description | Ti<sup>4+</sup>-ion-doped (<i>n</i> + 1)SrO − <i>n</i>CeO<sub>2</sub> (<i>n</i> = 2) ceramic systems were prepared with the conventional solid-state reaction method, and the effects of the phase structures and compositions, sintering behaviors, microstructures and microwave dielectric properties of these ceramic systems were investigated in detail as a function of TiO<sub>2</sub> content. The analytical results of the XRD patterns show that the pure (<i>n</i> + 1)SrO − <i>n</i>CeO<sub>2</sub> (<i>n</i> = 2) system is a composite-phase ceramic system with coexisting SrCeO<sub>3</sub> and Sr<sub>2</sub>CeO<sub>4</sub> phases (represented as a SrCeO<sub>3</sub> + Sr<sub>2</sub>CeO<sub>4</sub> system), which belong to the orthogonal structures of the Pmcn (62) and Pbam (55) space groups, respectively. For the <i>x</i>TiO<sub>2</sub>-(1 − x) (SrCeO<sub>3</sub> + Sr<sub>2</sub>CeO<sub>4</sub>) (<i>x</i> = 0.1–0.4) ceramic samples, the secondary phase Sr<sub>2</sub>TiO<sub>4</sub> can also be detected within the range of the investigated components. Meanwhile, the Raman spectroscopy, SEM-EDS, and HRTEM (SAED) analysis results also verified the correctness and consistency of the phase structures and compositions for all the given specimens. In addition, complex impedance spectroscopy was used to detect the conductive behavior of these compound ceramic systems, and the calculation results show that the appropriate addition of Ti<sup>4+</sup>-ions can make the SrCeO<sub>3</sub> + Sr<sub>2</sub>CeO<sub>4</sub> system have better thermal stability. The composition of <i>x</i> = 0.2 multiphase structural ceramic sample sintered at 1330 °C for 4 h has a near zero τ<i><sub>f</sub></i> value of ~−4.6 ppm/°C, a moderate <i>ε</i><sub>r</sub> of ~40.3 and a higher <i>Q</i> × <i>f</i>~44,020 GHz (at 6.56 GHz). The relatively superior-performing ceramics developed in this work are expected to provide a promising microwave dielectric material for communication components. |
| first_indexed | 2024-03-11T02:36:20Z |
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| language | English |
| last_indexed | 2024-03-11T02:36:20Z |
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| spelling | doaj.art-f1be4bb4c4a847e3ba2ac6967338c0f12023-11-18T09:57:04ZengMDPI AGCrystals2073-43522023-06-0113695510.3390/cryst13060955Phase Structures and Dielectric Properties of (<i>n</i> + 1)SrO − <i>n</i>CeO<sub>2</sub> (<i>n</i> = 2) Microwave Ceramic Systems with TiO<sub>2</sub> AdditionQi Su0Jingjing Qu1Fei Liu2Changlai Yuan3Xiao Liu4Mingwei Su5Liufang Meng6Guohua Chen7School of Mechanical and Electrical Engineering, Guilin University of Electronic Technology, Guilin 541004, ChinaSchool of Electronic Engineering Automation, Guilin University of Electronic Technology, Guilin 541004, ChinaSchool of Mechanical and Electrical Engineering, Guilin University of Electronic Technology, Guilin 541004, ChinaGuangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin 541004, ChinaGuangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin 541004, ChinaGuangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin 541004, ChinaGuangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin 541004, ChinaGuangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin 541004, ChinaTi<sup>4+</sup>-ion-doped (<i>n</i> + 1)SrO − <i>n</i>CeO<sub>2</sub> (<i>n</i> = 2) ceramic systems were prepared with the conventional solid-state reaction method, and the effects of the phase structures and compositions, sintering behaviors, microstructures and microwave dielectric properties of these ceramic systems were investigated in detail as a function of TiO<sub>2</sub> content. The analytical results of the XRD patterns show that the pure (<i>n</i> + 1)SrO − <i>n</i>CeO<sub>2</sub> (<i>n</i> = 2) system is a composite-phase ceramic system with coexisting SrCeO<sub>3</sub> and Sr<sub>2</sub>CeO<sub>4</sub> phases (represented as a SrCeO<sub>3</sub> + Sr<sub>2</sub>CeO<sub>4</sub> system), which belong to the orthogonal structures of the Pmcn (62) and Pbam (55) space groups, respectively. For the <i>x</i>TiO<sub>2</sub>-(1 − x) (SrCeO<sub>3</sub> + Sr<sub>2</sub>CeO<sub>4</sub>) (<i>x</i> = 0.1–0.4) ceramic samples, the secondary phase Sr<sub>2</sub>TiO<sub>4</sub> can also be detected within the range of the investigated components. Meanwhile, the Raman spectroscopy, SEM-EDS, and HRTEM (SAED) analysis results also verified the correctness and consistency of the phase structures and compositions for all the given specimens. In addition, complex impedance spectroscopy was used to detect the conductive behavior of these compound ceramic systems, and the calculation results show that the appropriate addition of Ti<sup>4+</sup>-ions can make the SrCeO<sub>3</sub> + Sr<sub>2</sub>CeO<sub>4</sub> system have better thermal stability. The composition of <i>x</i> = 0.2 multiphase structural ceramic sample sintered at 1330 °C for 4 h has a near zero τ<i><sub>f</sub></i> value of ~−4.6 ppm/°C, a moderate <i>ε</i><sub>r</sub> of ~40.3 and a higher <i>Q</i> × <i>f</i>~44,020 GHz (at 6.56 GHz). The relatively superior-performing ceramics developed in this work are expected to provide a promising microwave dielectric material for communication components.https://www.mdpi.com/2073-4352/13/6/955phase structures and compositionsSrCeO<sub>3</sub> + Sr<sub>2</sub>CeO<sub>4</sub> systemTiO<sub>2</sub> additionmicrowave dielectric properties |
| spellingShingle | Qi Su Jingjing Qu Fei Liu Changlai Yuan Xiao Liu Mingwei Su Liufang Meng Guohua Chen Phase Structures and Dielectric Properties of (<i>n</i> + 1)SrO − <i>n</i>CeO<sub>2</sub> (<i>n</i> = 2) Microwave Ceramic Systems with TiO<sub>2</sub> Addition Crystals phase structures and compositions SrCeO<sub>3</sub> + Sr<sub>2</sub>CeO<sub>4</sub> system TiO<sub>2</sub> addition microwave dielectric properties |
| title | Phase Structures and Dielectric Properties of (<i>n</i> + 1)SrO − <i>n</i>CeO<sub>2</sub> (<i>n</i> = 2) Microwave Ceramic Systems with TiO<sub>2</sub> Addition |
| title_full | Phase Structures and Dielectric Properties of (<i>n</i> + 1)SrO − <i>n</i>CeO<sub>2</sub> (<i>n</i> = 2) Microwave Ceramic Systems with TiO<sub>2</sub> Addition |
| title_fullStr | Phase Structures and Dielectric Properties of (<i>n</i> + 1)SrO − <i>n</i>CeO<sub>2</sub> (<i>n</i> = 2) Microwave Ceramic Systems with TiO<sub>2</sub> Addition |
| title_full_unstemmed | Phase Structures and Dielectric Properties of (<i>n</i> + 1)SrO − <i>n</i>CeO<sub>2</sub> (<i>n</i> = 2) Microwave Ceramic Systems with TiO<sub>2</sub> Addition |
| title_short | Phase Structures and Dielectric Properties of (<i>n</i> + 1)SrO − <i>n</i>CeO<sub>2</sub> (<i>n</i> = 2) Microwave Ceramic Systems with TiO<sub>2</sub> Addition |
| title_sort | phase structures and dielectric properties of i n i 1 sro i n i ceo sub 2 sub i n i 2 microwave ceramic systems with tio sub 2 sub addition |
| topic | phase structures and compositions SrCeO<sub>3</sub> + Sr<sub>2</sub>CeO<sub>4</sub> system TiO<sub>2</sub> addition microwave dielectric properties |
| url | https://www.mdpi.com/2073-4352/13/6/955 |
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