NDLI: Complex chemical bond theory, Raman spectra and microwave dielectric properties of low loss ceramics NdNbO$_{4}$–xAl$_{2}$O$

Content Provider	Springer Nature Link
Author	Zhao, Yonggui Zhang, Ping
Copyright Year	2015
Abstract	In this work, low loss microwave dielectric materials of NdNbO$_{4}$–x wt% Al$_{2}$O$_{3}$ ceramics were prepared via a solid-state reaction method. The complex chemical bond theory, phase composition, standard deviation (σ) of the bond angles, microstructures, microwave dielectric properties and vibrational phonon modes were investigated. Microscopic analysis showed that sintered specimens presented single monoclinic fergusonite phase. The Rietveld refinements and Raman spectra were used to evaluate the correlation between the complex chemical bond theory and the microwave dielectric properties. With an increase of Al$_{2}$O$_{3}$ content, the Raman shift of A$_{g}$ (331 and 808 cm$^{−1}$) toward to the bigger value direction and the FWHM of A$_{g}$ (331 and 808 cm$^{−1}$) decrease, which lead to a decrease in bond ionicity and increase in lattice energy. The microwave dielectric properties of NdNbO$_{4}$–x wt% Al$_{2}$O$_{3}$ exhibit closely relationship with the complex chemical bond theory. The variation trend of dielectric constant was accordance with the bond ionicity. The Q × f value and τ$_{ f }$ value were mainly dependence on the lattice energy and bond energy, respectively. Fine microwave dielectric properties for NdNbO$_{4}$–3 wt% Al$_{2}$O$_{3}$ ceramic was obtained with ε$_{r}$ = 18.1, Q × f = 54,700 GHz (9.1 GHz), τ$_{ f }$ = −0.51 ppm/°C sintered at 1150 °C for 4 h.
Starting Page	2511
Ending Page	2522
Page Count	12
File Format	PDF
ISSN	09574522
Journal	Journal of Materials Science: Materials in Electronics
Volume Number	27
Issue Number	3
e-ISSN	1573482X
Language	English
Publisher	Springer US
Publisher Date	2015-11-17
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Optical and Electronic Materials Characterization and Evaluation of Materials
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Biomaterials Biophysics Condensed Matter Physics Electronic, Optical and Magnetic Materials Bioengineering Electrical and Electronic Engineering Biomedical Engineering

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