Controllable τf value of barium silicate microwave dielectric ceramics with different Ba/Si ratios

Ba1+1/M[Si2O5+1/M] low‐permittivity microwave dielectric ceramics are prepared using the conventional solid‐state method. Pure phases are obtained in barium silicates with M = 1, 3, 4, 5, and ∞, except for M = 7, in which two phases, Ba5Si8O21 and BaSi2O5, are observed. As the complexity of the crys...

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Published in:Journal of the American Ceramic Society 2018-01, Vol.101 (1), p.25-30
Main Authors: Lei, Wen, Zou, Zheng‐Yu, Chen, Ze‐Hao, Ullah, Burhan, Zeb, Aurang, Lan, Xue‐Kai, Lu, Wen‐Zhong, Fan, Gui‐Fen, Wang, Xiao‐Hong, Wang, Xiao‐Chuan
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dielectric properties
electroceramics
silicates
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container_title Journal of the American Ceramic Society
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creator Lei, Wen
Zou, Zheng‐Yu
Chen, Ze‐Hao
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Zeb, Aurang
Lan, Xue‐Kai
Lu, Wen‐Zhong
Fan, Gui‐Fen
Wang, Xiao‐Hong
Wang, Xiao‐Chuan
description Ba1+1/M[Si2O5+1/M] low‐permittivity microwave dielectric ceramics are prepared using the conventional solid‐state method. Pure phases are obtained in barium silicates with M = 1, 3, 4, 5, and ∞, except for M = 7, in which two phases, Ba5Si8O21 and BaSi2O5, are observed. As the complexity of the crystal structure described by the Shannon information per reduced unit cell increases, the τf value tends to change from a negative to a positive value, except for M = 5, which has the highest complexity. A single Ba5Si8O21 phase with εr anomaly peak at −180°C exhibits a rare positive τf value (+25 ppm/°C), which is a novel temperature compensator.
doi_str_mv 10.1111/jace.15205
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subjects dielectric properties
electroceramics
silicates
title Controllable τf value of barium silicate microwave dielectric ceramics with different Ba/Si ratios
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