Bond characteristics,vibrational spectrum and optimized microwave dielectric properties of chemically substituted NdNbO4 |
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| Affiliation: | 1. National Engineering Research Center of Electromagnetic Radiation Control Materials, University of Electronic Science and Technology of China, Chengdu, China, 610054;2. Key Laboratory of Multi-Spectral Absorbing Materials and Structures of Ministry of Education, University of Electronic Science and Technology of China, Chengdu, China, 610054;1. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Leninskii Pr. 31, Moscow, 119991, Russia;2. National Research Mordovia State University, 68 Bolshevistskaya Str., Saransk, 430005, Republic of Mordovia, Russia;1. Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, PR China;2. University of Science and Technology of China, Hefei 230026, PR China;3. Chemistry and Biochemistry, Utah State University, Logan 84322, USA;1. Jožef Stefan Institute, Jamova 39, SI-1000 Ljubljana, Slovenia;2. Laboratory of Dielectric Materials, School of Materials Science & Engineering, Zhejiang University, Hangzhou 310027, China |
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| Abstract: | Coordination chemistry, bond state and vibrational spectrum of co-substituted microwave dielectric NdNb1-x(Zr0.5W0.5)xO4 ceramics (x = 0.01∼0.05) were investigated. Raman spectra and XRD refinement showed a solid solution was formed. The compressed and elongated chemical bonds are responsible for the variations of crystal parameters and cell volume. Calculated chemical bond parameters indicated bond covalency, lattice energy and Nb-site bond energy act on the fluctuations of the permittivity, quality factor and temperature coefficient, respectively. Meanwhile, the infrared vibrational spectrum is fitted to quantify the contributions of observed IR mode to the intrinsic loss. Compact ceramic possesses excellent properties: εr ∼ 19.2, Q × f ∼ 55282 GHz and τf ∼ -11.36 ppm/°C with x = 0.04, at 1250°C. |
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| Keywords: | P-V-L theory Vibrational spectra Microwave dielectric ceramics |
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