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High-permittivity and low-loss microwave dielectric ceramics based on (x)RE(Zn1/2Ti1/2)O3-(1−x)CaTiO3 (RE=La and Nd)
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Feteira, Antonio, Iddles, David, Price, Tim, Muir, Duncan and Reaney, Ian M. (2010) High-permittivity and low-loss microwave dielectric ceramics based on (x)RE(Zn1/2Ti1/2)O3-(1−x)CaTiO3 (RE=La and Nd). Journal of the American Ceramic Society, Volume 94 (Number 3). pp. 817-821. doi:10.1111/j.1551-2916.2010.04173.x ISSN 0002-7820.
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Official URL: http://dx.doi.org/10.1111/j.1551-2916.2010.04173.x
Abstract
Compositions based on REZn(1/2)Ti(1/2)O(3)-CaTiO(3) (RE=La and Nd), suitable for microwave (MW) applications have been developed by systematically doping the perovskite B site with Ta(2)O(5), Al(2)O(3), and MgO in order to tune the temperature coefficient of the resonant frequency (tau(f)) and improve the MW quality factor (Q x f(r)) Optimized compositions, 0.45La(Zn(0.395)Ti(0.385)Ta(0.01)Al(0.21))O(3)-0.55CaTiO(3) (LZT-CT) and 0.32Nd(Zn(0.45)Mg(0.05)Ti(0.5))O(3)-0.10NdAlO(3)-0.58CaTiO(3) (NZT-CT) were prepared by solid-state reaction and have been characterized. X-ray diffraction (XRD) and scanning electron microscopy revealed that both compositions were single phase with a bulk microstructure composed of equiaxed grains (similar to 10 mu m). Electron diffraction and XRD demonstrated that, at room temperature, LZT-CT and NZT-CT were orthorhombic with space group Pnma, consistent with an a-a-c+ tilt system. Diffraction contrast transmission electron microscopy revealed a complex domain structure consisting of ferroelastic and antiphase domain boundaries. LZT-CT and NZT-CT had zero tau(f), epsilon(r)=49 and 44, Q x f(r)=29 600 GHz (at 1.957 GHz), and 32 200 GHz (at 1.971 GHz), respectively.
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Subjects: | Q Science > QC Physics T Technology > TK Electrical engineering. Electronics Nuclear engineering |
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| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
| Library of Congress Subject Headings (LCSH): | Electronic ceramics, Dielectrics | ||||
| Journal or Publication Title: | Journal of the American Ceramic Society | ||||
| Publisher: | Wiley-Blackwell Publishing Ltd. | ||||
| ISSN: | 0002-7820 | ||||
| Official Date: | March 2010 | ||||
| Dates: |
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| Volume: | Volume 94 | ||||
| Number: | Number 3 | ||||
| Page Range: | pp. 817-821 | ||||
| DOI: | 10.1111/j.1551-2916.2010.04173.x | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access | ||||
| Funder: | Engineering and Physical Sciences Research Council (EPSRC), Advantage West Midlands (AWM) , European Regional Development Fund (ERDF) |
Data sourced from Thomson Reuters' Web of Knowledge
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