Internal relations between crystal structures and dielectric properties of (1- x )BaWO 4 - x TiO 2 composite ceramics
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Internal relations between crystal structures and dielectric properties of (1-x)BaWO4-xTiO2 composite ceramics Yuying Wang1, Jiqing Lv1, En-cai Xiao1, Ze-ming Qi2, Zhenxing Yue3, Ying Chen4, Guohua Chen5, and Feng Shi1,6,* 1
School of Material Science & Engineering, Shandong University of Science and Technology, Qingdao 266590, People’s Republic of China 2 National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, People’s Republic of China 3 State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, People’s Republic of China 4 Key Laboratory of Inorganic Functional Materials and Devices, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai 200050, People’s Republic of China 5 Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin 541004, People’s Republic of China 6 School of Materials Science and Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, People’s Republic of China
Received: 15 June 2020
ABSTRACT
Accepted: 18 September 2020
(1-x)BaWO4-xTiO2 (x = 0.00, 0.05, 0.10, 0.15, 0.20, 0.25, BWT) ceramics were prepared by traditional solid-state method. The XRD patterns indicate that the BWT ceramics exist as composites, and the Raman spectra show that as TiO2 increases, the vext mode shifts to a low wavenumber and the Ba–O bond length decreases. The variations in FWHM values of the v3(Eg) modes and c/a values indicate the changes in the ordered structures that lead to the increase in dielectric loss. The infrared spectra were fitted by the FPSQ model, and the external mode (Eu) contributes most to the dielectric properties, which is related to the Ba–O bond vibration. With the increase in x values, the sf values increase from - 101.61 to - 6.71 ppm/°C, the er values increase from 8.03 to 9.49, and the 0.75BaWO4–0.25TiO2 ceramic with stable temperature coefficient was obtained: er = 9.49, Q 9 f = 20,602 GHz (f = 17.99 GHz), sf = - 6.71 ppm/°C.
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Springer Science+Business
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Yuying Wang, Jiqing Lv, and En-cai Xiao have contributed equally to this work and should be considered as co-first authors.
Address correspondence to E-mail: [email protected]
https://doi.org/10.1007/s10854-020-04519-9
J Mater Sci: Mater Electron
1 Introduction During the last few years, microwave dielectric ceramics (MWDCs) have become a hotspot in the realm of dielectric materials as microwave mobile technology is being developed so quickly [1–3]. They are characterized by a suitable dielectric constant (er), a high quality factor (Q 9 f), and a frequency temperature coefficient (sf) close to zero [4–8]. So far, many kinds of MWDCs have been developed, and among them, AWO4-type (A = Mg, Zn, Mn, Ca, Sr, Ba) ceramics have been widely studied because of their good properties [9–13]. Yoon et al. studied this system and reported their performance, such as
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