Investigation on phase structure,spectral characteristics,microstructure and microwave dielectric properties of Li2Zn[Ti1-x(Co1/3Nb2/3)x]3O8 (0.0 ≤ x ≤ 0.4) ceramics |
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| Affiliation: | 1. Institute of Solid State Chemistry UB RAS, 620041, 91, Pervomayskaya St., Yekaterinburg, Russia;2. Institute of Natural Science and Mathematics, Ural Federal University, 620000, 51 Lenin Av., Yekaterinburg, Russia;3. Laboratory of Hydrogen Energy, Ural Federal University, 620002, 19 Mira St., Yekaterinburg, Russia;1. Department of Physics, Deenbandhu Chhotu Ram University of Science and Technology, Murthal, Haryana, India;2. Department of Physics, Guru Jambheshwar University of Science and Technology, Hisar, Haryana, India;1. School of Materials Science and Engineering, Harbin Institute of Technology Weihai, Weihai, 264205, China;2. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150006, China;1. Southwest Institute of Technology and Engineering, Chongqing, 400039, China;2. College of Materials Science and Engineering, Chongqing University, Chongqing, 400045, China;1. National Metrology Institute of Japan, National Institute of Advanced Industrial Science and Technology, 1-1-1 Umezono, Tsukuba, Ibaraki, 305-8568, Japan;2. Division of Materials Science, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma, Nara, 630-0192, Japan;3. Co-creative Research Center of Industrial Science and Technology, Kanazawa Institute of Technology, Hakusan, Ishikawa, 924-0838, Japan |
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| Abstract: | In this paper, a series of Li2ZnTi1-x(Co1/3Nb2/3)x]3O8 (0.0 ≤ x ≤ 0.4) ceramics were prepared via the conventional solid-state method. The influences of (Co1/3Nb2/3)4+ complex ions on the phase composition, spectral characteristics, microstructure, and microwave dielectric properties of Li2ZnTi1-x(Co1/3Nb2/3)x]3O8 ceramics were studied systematically. XRD analysis accompanied with Rietveld refinements showed that pure Li2ZnTi3O8 solid solution ceramics with the cubic spinel structure were obtained at x = 0.2–0.4. New Raman-active mode of about 858 cm?1 should be attributed to the vibrations of NbO6 due to the high bond energy of Nb–O bonds, exerting a certain impact on the structure and performance of Li2ZnTi1-x(Co1/3Nb2/3)x]3O8 ceramics. XPS results indicated that Nb5+ ion donor suppressed the deoxidation process and therefore resulted in the disappearance of Ti3+ ion and oxygen vacancy. The downward trend variation in the εr value with the increase of (Co1/3Nb2/3)4+ content could be explained by the presence of “compressed” cations and “rattling” cations effect. In addition, the Q × f of the current ceramics was closely dependent on relative density, grain size, FWHM, and oxygen vacancy. Good combined microwave dielectric properties of εr = 24.5, Q × f = 91,250 GHz, and τf = ?16.8 ppm/°C were achieved for the Li2ZnTi0.8(Co1/3Nb2/3)0.2]3O8 ceramic sintered at 1120 °C. High quality factor gives evidence that the Li2ZnTi0.8(Co1/3Nb2/3)0.2]3O8 ceramic is an appealing candidate for highly selective microwave devices. |
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| Keywords: | Raman spectroscopy X-ray photoelectron spectroscopy Microwave dielectric properties |
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