Dielectric and structural characteristics of perovskites and related materials as a function of tolerance factor
The temperature coefficient of the dielectric permittivity (τ ϵ ) and resonant frequency (τ f ) of perovskites and related materials is important in the application of these ceramics to microwave filters and resonators. Recent work has directly related changes in τ ϵ , and therefore τ f , to the ons...
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| Published in: | Ferroelectrics 1999-01, Vol.228 (1), p.23-38 |
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| Main Authors: | , |
| Format: | Article |
| Language: | eng |
| Subjects: | |
| Online Access: | Get full text |
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| Summary: | The temperature coefficient of the dielectric permittivity (τ
ϵ
) and resonant frequency (τ
f
) of perovskites and related materials is important in the application of these ceramics to microwave filters and resonators. Recent work has directly related changes in τ
ϵ
, and therefore τ
f
, to the onset of octahedral tilting in Ba- and Sr-based complex perovskites. Whether a compound is tilted at room temperature or not depends largely on the tolerance factor, t. The relationship between t and τ
ϵ
is reviewed in perovskites and the effect of changing tolerance factor on τ
ϵ
in the perovskite-related solid solution series Ba
6-3x
Nd
8+2x
Ti
18
O
54
is discussed. Transmission electron microscopy is used to demonstrate examples of phase transformations in the above systems |
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| ISSN: | 0015-0193 1563-5112 |