High-permittivity and low-loss microwave dielectric ceramics based on (x)RE(Zn1/2Ti1/2)O3-(1−x)CaTiO3 (RE=La and Nd)

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 Ceramics Society, 94 (3), 817-821.

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Official URL: http://dx.doi.org/10.1111/j.1551-2916.2010.04173.x
Link to published version:: 10.1111/j.1551-2916.2010.04173.x

Abstract

Compositions based on REZn1/2Ti1/2O3–CaTiO3 (RE=La and Nd), suitable for microwave (MW) applications have been developed by systematically doping the perovskite B site with Ta2O5, Al2O3, and MgO in order to tune the temperature coefficient of the resonant frequency (τf) and improve the MW quality factor (Q ×fr) Optimized compositions, 0.45La(Zn0.395Ti0.385Ta0.01Al0.21)O3–0.55CaTiO3 (LZT-CT) and 0.32Nd(Zn0.45Mg0.05Ti0.5)O3–0.10NdAlO3–0.58CaTiO3 (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 (∼10 μm). 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 τf, ɛr=49 and 44, Q×fr=29 600 GHz (at 1.957 GHz), and 32 200 GHz (at 1.971 GHz), respectively.

Item Type: Article
Research Institute, Centre or Group: Materials and Engineering Research Institute > Structural Materials and Integrity Research Centre > Centre for Corrosion Technology
Identification Number: 10.1111/j.1551-2916.2010.04173.x
Depositing User: Hilary Ridgway
Date Deposited: 06 Jun 2012 10:41
Last Modified: 06 Jun 2012 10:41
URI: http://shura.shu.ac.uk/id/eprint/5313

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