Crystal structure and phase formation of MgO-MoO₃-based ceramics with ultralow dielectric loss: A comprehensive study

Li, Xiaoyu1; Wang, Hongye1; Xu, Xinwei1; Chen, Naichao1; Guo, Biao1; Cheng, Jin1; Chen, Xianqiang1,2; Wang, Hong1,2

2023-10-01

10.1111/jace.19500

JOURNAL OF THE AMERICAN CERAMIC SOCIETY   Impact Factor & Quartile

0002-7820

1551-2916

The MgO-MoO3 system shows significant potential for applications in microwave dielectric ceramics. However, the formation mechanism, crystal structures, and microwave dielectric properties of this system have not been systematically investigated. This work aims to comprehensively study the crystal structures, phase transitions, and microwave dielectric properties of compounds in the MgO-MoO3 system. In particular, the research delves into the unexplored transformation mechanism from beta-MgMo2O7 to alpha-MgMo2O7 and MgMoO4. As a result, the three compounds exhibiting favorable microwave dielectric properties have been successfully fabricated. These compounds can be effectively sintered at temperatures ranging from 685 to 900 degrees C and exhibited dielectric constants (epsilon(r)) ranging from 5.41 to 6.89, as well as Qf values ranging from 100 000 to 130 000 GHz. Additionally, prototype microstrip antennas are designed and fabricated using beta-MgMo2O7 and MgMoO4 ceramics as substrates. The obtained antenna's performance is excellent, with S-11 values below -30 dB and a gain exceeding 6 dB at 5.8 GHz, highlighting the potential of the developed ceramics for practical applications in microwave devices.

crystal structure MgO-MoO3 microwave dielectric ceramics phase transition

SCI

English

First ; Corresponding

The work was supported by Shenzhen Science and Technology Program (grant numbers: KQTD20180411143514543, JCYJ20220818100613029, and JSGGZD20220822095603006), and the Guangdong Provincial Key Laboratory Program (grant number: 2021B1212040001).["KQTD20180411143514543","JCYJ20220818100613029","JSGGZD20220822095603006"] ; Shenzhen Science and Technology Program[2021B1212040001]

Materials Science

Materials Science, Ceramics

WOS:001089237800001

WILEY

MATERIALS SCIENCE

Web of Science

1.Southern Univ Sci & Technol, Dept Mat Sci & Engn, Shenzhen 518055, Guangdong, Peoples R China
2.Southern Univ Sci & Technol, Guangdong Provis Key Lab Funct Oxide Mat & Devices, Shenzhen, Peoples R China

Li, Xiaoyu,Wang, Hongye,Xu, Xinwei,et al. Crystal structure and phase formation of MgO-MoO₃-based ceramics with ultralow dielectric loss: A comprehensive study[J]. JOURNAL OF THE AMERICAN CERAMIC SOCIETY,2023.

Li, Xiaoyu.,Wang, Hongye.,Xu, Xinwei.,Chen, Naichao.,Guo, Biao.,...&Wang, Hong.(2023).Crystal structure and phase formation of MgO-MoO₃-based ceramics with ultralow dielectric loss: A comprehensive study.JOURNAL OF THE AMERICAN CERAMIC SOCIETY.

Li, Xiaoyu,et al."Crystal structure and phase formation of MgO-MoO₃-based ceramics with ultralow dielectric loss: A comprehensive study".JOURNAL OF THE AMERICAN CERAMIC SOCIETY (2023).