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Research Article | Open Access

Sintering characteristics, phase transitions, and microwave dielectric properties of low-firing [(Na0.5Bi0.5)xBi1−x](WxV1−x)O4 solid solution ceramics

Xian Xuea, Xiaomeng Lib, Changli Fub, Yan Zhangd, Jing Guob( ), Hong Wangc( )
State Key Laboratory for Mechanical Behavior of Materials, Faculty of Electronic and Information Engineering, Xi’an Jiaotong University, Xi’an 710049, China
State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, China
Department of Materials Science and Engineering & Shenzhen Engineering Research Center for Novel Electronic Information Materials and Devices, Southern University of Science and Technology, Shenzhen 518055, China
Department of Physiology and Pathophysiology, Shaanxi Engineering and Research Center of Vaccine, Key Laboratory of Environment and Genes Related to Diseases of Education Ministry of China, School of Basic Medical Sciences, Xi’an Jiaotong University, Xi’an 710061, China
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Abstract

A series of high-k [(Na0.5Bi0.5)xBi1−x](WxV1−x)O4 (abbreviated as NBWV(x value)) solid solution ceramics with a scheelite-like structure are synthesized by a modified solid-state reaction method at the temperature range of 680–760 ℃. A monoclinic (0 ≤ x < 0.09) to tetragonal scheelite (0.09 ≤ x ≤ 1.0) structural phase transition is confirmed by X-ray diffraction (XRD), Raman, and infrared (IR) analyses. The effect of structural deformation and order–disorder caused by Na+/Bi3+/W6+ complex substitution on microwave dielectric properties is investigated in detail. The compositional series possess a wide range of variable relative permittivity (εr = 24.8–80) and temperature coefficient of resonant frequency (TCF value, −271.9–188.9 ppm/℃). The maximum permittivity of 80 and a high Q×f value of ~10,000 GHz are obtained near the phase boundary at x = 0.09. Furthermore, the temperature-stable dielectric ceramics sintered at 680 ℃ with excellent microwave dielectric properties of εr = 80.7, Q×f = 9400 GHz (at 4.1 GHz), and TCF value = −3.8 ppm/℃ are designed by mixing the components of x = 0.07 and 0.08. In summary, similar sinterability and structural compatibility of scheelite-like solid solution systems make it potential for low-temperature co-fired ceramic (LTCC) applications.

Keywords

structural phase transitionorder–disorder phenomenamicrowave ceramicsdielectric behaviorlow sintering temperatures

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Journal of Advanced Ceramics
Volume 12 Issue 6,
June 2023
Pages 1178-1188
DOI: 10.26599/JAC.2023.9220747
Cite this article:
Xue X, Li X, Fu C, et al. Sintering characteristics, phase transitions, and microwave dielectric properties of low-firing [(Na0.5Bi0.5)xBi1−x](WxV1−x)O4 solid solution ceramics. Journal of Advanced Ceramics, 2023, 12(6): 1178-1188. https://doi.org/10.26599/JAC.2023.9220747

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Received: 16 January 2023
Revised: 06 March 2023
Accepted: 23 March 2023
Published: 09 May 2023
© The Author(s) 2023.

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