High quality factor microwave dielectric ceramics in the (Mg1/3Nb2/3)O2–ZrO2–TiO2 ternary system |
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| Authors: | Wen‐Bo Li Di Zhou Li‐Xia Pang Yan‐Zhu Dai Ze‐Ming Qi Qiu‐Ping Wang Han‐Chen Liu |
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| Affiliation: | 1. Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education & International Center for Dielectric Research, Xi'an Jiaotong University, Xi'an, Shaanxi, China;2. Xi'an Jiaotong University Suzhou Academy, Suzhou, Jiangsu, China;3. Department of Materials Science and Engineering, University of Sheffield, Sheffield, UK;4. Micro‐optoelectronic Systems Laboratories, Xi'an Technological University, Xi'an, Shaanxi, China;5. National Synchrotron Radiation Laboratory, University of Science and Technology of China, Anhui, Hefei, China;6. School of Science, Xi'an Polytechnic University, Xi'an, China |
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| Abstract: | Novel high quality factor microwave dielectric ceramics (1?x)ZrTiO4?x(Mg1/3Nb2/3)TiO4 (0.325≤x≤0.4) and (ZrTi)1?y(Mg1/3Nb2/3)yO4 (0.2≤y≤0.5) with the addition of 0.5 wt% MnCO3 in the (Mg1/3Nb2/3)O2–ZrO2–TiO2 ternary system were prepared, using solid‐state reaction method. The relationship between the structure and microwave dielectric properties of the ceramics was studied. The XRD patterns of the sintered samples reveal the main phase belonged to α‐PbO2‐type structure. Raman spectroscopy and infrared reflectivity (IR) spectra were employed to evaluate phonon modes of ceramics. The 0.65ZrTiO4?0.35(Mg1/3Nb2/3)TiO4?0.5 wt% MnCO3 ceramic can be well densified at 1240°C for 2 hours and exhibits good microwave dielectric properties with a relative permittivity (εr) of 42.5, a quality factor (Q×f) value of 43 520 GHz (at 5.9 Ghz) and temperature coefficient of resonant frequency (τf) value of ?5ppm/°C. Furthermore, the (ZrTi)0.7(Mg1/3Nb2/3)0.3O4?0.5 wt% MnCO3 ceramic sintered at 1260°C for 2 hours possesses a εr of 31.8, a Q×f value of 35 640 GHz (at 6.3 GHz) and a near zero τf value of ?5.9 ppm/°C. The results demonstrated that the (Mg1/3Nb2/3)O2–ZrO2–TiO2 ternary system with excellent properties was a promising material for microwave electronic device applications. |
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| Keywords: | dielectric materials/properties phase diagrams solid solutions sinter/sintering |
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