Modification of NdNbO4 microwave dielectric ceramic by Bi substitutions

In the present work, Bi3+ was used to substitute for Nd3+ in the NdNbO4 ceramic and pure fergusonite solid solution was formed within 20 mol. % substitutions. Microwave dielectric permittivity of the (Nd1‐xBix)NbO4 (x ≤ 0.2) ceramics increased linearly with x value due to the larger ionic polarizabi...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2019-05, Vol.102 (5), p.2278-2282
Main Authors: Pang, Li‐Xia, Zhou, Di
Format: Article
Language:English
Subjects:
Ceramics
Dielectric properties
fergusonite
microwave dielectric ceramics
NdNbO4
Permittivity
Q factors
Resonant frequencies
Solid solutions
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Summary:In the present work, Bi3+ was used to substitute for Nd3+ in the NdNbO4 ceramic and pure fergusonite solid solution was formed within 20 mol. % substitutions. Microwave dielectric permittivity of the (Nd1‐xBix)NbO4 (x ≤ 0.2) ceramics increased linearly with x value due to the larger ionic polarizability of Bi3+ than Nd3+. Excellent microwave dielectric properties with a permittivity (εr) ~22.5, a Qf (Q = quality factor, f = resonant frequency) ~50 000 GHz, and a TCF ~−9 ppm/°C were obtained in the (Nd0.9Bi0.1)NbO4 ceramic. This method might work in other fergusonite‐type rare‐earth ortho‐niobates. Temperature coefficient of NdNbO4 microwave ceramic was adjusted to near zero by Bi substitutions.
ISSN:0002-7820
1551-2916
DOI:10.1111/jace.16290