Sintering characteristics, phase transitions, and microwave dielectric properties of low-firing [(Na_(0.5)Bi_(0.5))_(x)Bi_(1-x)](W_(x)V_(1-x))O_(4) solid solutionceramics  

作　　者：Xian Xue Xiaomeng Li Changli Fu Yan Zhang Jing Guo Hong Wang 

机构地区：[1]State Key Laboratory for Mechanical Behavior of Materials,Faculty of Electronic and Information Engineering,Xi'an Jiaotong University,Xi'an 710049,China [2]State Key Laboratory for Mechanical Behavior of Materials,School of Materials Science and Engineering,Xi'an Jiaotong University,Xi'an 710049,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 [4]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

出　　处：《Journal of Advanced Ceramics》2023年第6期1178-1188,共11页先进陶瓷（英文）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.61631166004 and 51902245);Hong Wang acknowledged the support of Shenzhen Science and Technology Program(Nos.KQTD20180411143514543 and JSGGZD20220822095603006)。

摘　　要：A series of high-k[(Na_(0.5)Bi_(0.5))_(x)Bi_(1-x)](W_(x)V_(1-x))O_(4)(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 C.A monoclinic(0≤x<0.09)to tetragonal scheelite(0.09≤x≤1.0)structural phase transition is confirmed by X-ray difraction(XRD),Raman,and infrared(IR)analyses.The effect of structural deformation and order-disorder caused by Na^(+)/Bi^(3+)/W^(6+) complex substitution on microwave dielectric properties is investigated in deail.The compositional series possess a wide range of variable relative permittivity(er=24.8-80)and temperature coefficient of resonant frequency(TCF value,-271.9-188.9 ppm/℃).The maximum permittivity of 80 and a high Qxf value of~10,000 GHz are obtained near the phase boundary at x=0.09.Furthermore,the temperature-stable dielectric ceramics sintered at 680 C with excellent microwave dielectric properties of ε_(r)=80.7,Qxf=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.

关 键 词：structural phase transition order-disorder phenomena microwave ceramics dielectric behavior low sintering temperatures 

分 类 号：TQ137.12[化学工程—无机化工]