Nonstoichiometric microwave dielectric ceramics [(Na0.5-xBi0.5+x/3)0.5Ca0.5]MoO4 with low sintering temperatures

Li，Xiaomeng1; Zhang，Yan2; Guo，Jing1; Wang，Hong1,3

2021

10.1016/j.jeurceramsoc.2021.07.057

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY   影响因子和分区

0955-2219

1873-619X

In this work, [(NaBi)Ca]MoO (x = ±0.03, ±0.06, ±0.09, ±0.12) microwave dielectric ceramics prepared by the solid-state reaction method are investigated. All the samples can be sintered well below 800℃. The sintered ceramics show a scheelite structure without any secondary phase, indicating that a solid solution is formed in nonstoichiometric [(NaBi)Ca]MoO. While x value increases from -0.12 to 0.12, the relative permittivity rises from 16.7 to 21.0, TCF value is improved from -21 ppm/℃ to +1 ppm/℃, and Q × f value varies in the range of 17,000 GHz and 34,000 GHz. The Raman analysis reveals that one of the external modes is attributed to be the main factor affecting the performances. When x = 0.09 and 0.12, high performance microwave dielectric ceramics can be well densified at low sintering temperatures (750−775℃) with relative permittivities of 20.9–21.0, improved Q × f values of 31,400−33,000 GHz, and near-zero temperature coefficients of resonate frequency (|TCF| ≈ ±2 ppm/℃).

Low-firing Microwave dielectric ceramics Near-zero temperature coefficients Nonstoichiometric Scheelite solid solution

SCI ; EI

英语

其他

National Natural Science Foundation of China[51902245] ; Natural Science Foundation of Shaanxi Province[2020JQ-044]

Materials Science

Materials Science, Ceramics

WOS:000691611700005

ELSEVIER SCI LTD

20213210734319

Ceramic materials ; Permittivity ; Sintering ; Solid solutions ; Solid state reactions ; Temperature ; Tungstate minerals

Minerals:482.2 ; Thermodynamics:641.1 ; Electromagnetic Waves:711 ; Chemical Reactions:802.2 ; Ceramics:812.1 ; Solid State Physics:933

MATERIALS SCIENCE

2-s2.0-85111944524

Scopus

1.State Key Laboratory for Mechanical Behavior of Materials,School of Materials Science and Engineering,Xi'an Jiaotong University,Xi'an,710049,China
2.Department of Physiology and Pathophysiology,School of Basic Medical Sciences,Key Laboratory of Environment and Genes Related to Diseases of Education Ministry of China,Xi'an Jiaotong University,Xi'an,710061,China
3.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

Li，Xiaomeng,Zhang，Yan,Guo，Jing,et al. Nonstoichiometric microwave dielectric ceramics [(Na0.5-xBi0.5+x/3)0.5Ca0.5]MoO4 with low sintering temperatures[J]. JOURNAL OF THE EUROPEAN CERAMIC SOCIETY,2021,41(14):7029-7034.

Li，Xiaomeng,Zhang，Yan,Guo，Jing,&Wang，Hong.(2021).Nonstoichiometric microwave dielectric ceramics [(Na0.5-xBi0.5+x/3)0.5Ca0.5]MoO4 with low sintering temperatures.JOURNAL OF THE EUROPEAN CERAMIC SOCIETY,41(14),7029-7034.

Li，Xiaomeng,et al."Nonstoichiometric microwave dielectric ceramics [(Na0.5-xBi0.5+x/3)0.5Ca0.5]MoO4 with low sintering temperatures".JOURNAL OF THE EUROPEAN CERAMIC SOCIETY 41.14(2021):7029-7034.