Low-temperature-sintered MgO-based microwave dielectric ceramics with ultralow loss and high thermal conductivity

Zhao, Binfeng; Chen, Xianqiang; Chen, Naichao; Xu, Xinwei; Lu, Yani; Cheng, Jin; Wang, Hong

2022-10-01

10.1111/jace.18835

JOURNAL OF THE AMERICAN CERAMIC SOCIETY   Impact Factor & Quartile

0002-7820

1551-2916

With the development of 5G/6G communication, the requirements of portable devices for miniaturization and multifunction make low-temperature co-fired ceramic (LTCC) more and more important. In the area of high-frequency high-density passive integration, microwave dielectric ceramics with a low dielectric loss and high thermal conductivity are urgently needed to ensure the effective signals transmission and system reliability. However, most microwave dielectric ceramics with a low dielectric loss were not applicable for the LTCC technology due to the high sintering temperature. In this work, a series of MgO-based ceramics [(100 - x) wt.% MgO-x wt.% (0.2SrF(2)-0.8LiF) (x = 5,7,10)] were prepared by solid-state reaction method. The addition of sintering aid 0.2SrF(2)-0.8LiF (S2L8) decreased the sintering temperature below 880 degrees C without degrading the microwave dielectric properties of ceramics. Microwave dielectric properties of ceramics, including quality factor Q x f, relative permittivity epsilon(r), and temperature coefficient of resonant frequency tau(f), were investigated to find the optimum composition and sintering temperature. In general, MgO-7 wt.% S2L8 ceramic sintered at 860 degrees C exhibits outstanding properties of Q x f = 180 233 GHz, epsilon(r) = 9.11, tau(f) = -40.33 ppm/degrees C, and a high thermal conductivity of 24.02 W/(m K). This series of ceramics are suitable to be co-fired with Ag electrodes. With all those great properties, this series of MgO-based ceramics are expected to be the candidates for LTCC applications in 5G/6G technology.

fluoride LTCC MgO microwave dielectric ceramic thermal conductivity

SCI

English

First ; Corresponding

Key Area Research Plan of Guangdong[2020B010176001] ; Shenzhen Science and Technology Program["KQTD20180411143514543","JCYJ20180504165831308"] ; Department of Science and Technology of Guangdong Province[2021B1212040001]

Materials Science

Materials Science, Ceramics

WOS:000870535100001

WILEY

MATERIALS SCIENCE

Web of Science

Southern Univ Sci & Technol, Dept Mat Sci & Engn, Shenzhen 518055, Peoples R China

Zhao, Binfeng,Chen, Xianqiang,Chen, Naichao,et al. Low-temperature-sintered MgO-based microwave dielectric ceramics with ultralow loss and high thermal conductivity[J]. JOURNAL OF THE AMERICAN CERAMIC SOCIETY,2022.

Zhao, Binfeng.,Chen, Xianqiang.,Chen, Naichao.,Xu, Xinwei.,Lu, Yani.,...&Wang, Hong.(2022).Low-temperature-sintered MgO-based microwave dielectric ceramics with ultralow loss and high thermal conductivity.JOURNAL OF THE AMERICAN CERAMIC SOCIETY.

Zhao, Binfeng,et al."Low-temperature-sintered MgO-based microwave dielectric ceramics with ultralow loss and high thermal conductivity".JOURNAL OF THE AMERICAN CERAMIC SOCIETY (2022).