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Reduced Dielectric Loss of Modified ZnNb 2 O 6 Ceramics by Substituting Nb 5+ with Ta 5+
Author(s) -
Huang ChengLiang,
Chen JhihYong
Publication year - 2009
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2009.03077.x
Subject(s) - materials science , solid solution , analytical chemistry (journal) , dielectric , ceramic , dielectric loss , relative density , microwave , mineralogy , nuclear chemistry , microstructure , chemistry , metallurgy , physics , optoelectronics , chromatography , quantum mechanics
The effects of substituting Nb 5+ with Ta 5+ on the microwave dielectric properties of the ZnNb 2 O 6 ceramics were investigated in this study. The forming of Zn(Nb 1− x Ta x ) 2 O 6 ( x =0–0.09) solid solution was confirmed by the measured lattice parameters and the EDX analysis. By increasing x , not only could the Q × f of the Zn(Nb 1− x Ta x ) 2 O 6 ( x =0–0.09) solid solution be tremendously boosted from 83 600 GHz at x =0 to a maximum 152 000 GHz at x =0.05, the highest ɛ r ∼24.6 could also be achieved simultaneously. It was mainly due to the uniform grain morphology and the highest relative density of the specimen. A fine combination of microwave dielectric properties (ɛ r ∼24.6, Q × f ∼152 000 GHz at 8.83 GHz, τ f ∼–71.1 ppm/°C) was achieved for Zn(Nb 0.95 Ta 0.05 ) 2 O 6 solid solution sintered at 1175°C for 2 h.