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Reduced Dielectric Loss in New Colossal Permittivity (Pr, Nb)TiO2 Ceramics by Suppressing Adverse Effects of Secondary Phases

Abstract

Here, we develop new colossal permittivity (CP) (Pr0.5Nb0.5)xTi1-xO2 ceramics by controlling the secondary phases, and then both colossal permittivity (εr=6~8104, 1 kHz) and low dielectric loss (tan δ=3.7~7.5%, 1 kHz) can be realized in the wide composition range (x=0.5%-2.5%). The ceramics with x=1% possess high dielectric constant (εr=74533), and importantly low dielectric loss (tan δ=3.7%) can be found, which is lower than most of typical CP materials and chemical modified TiO2 ceramics. In addition, the ɛr changing rate of 143/1 oC and 35/1 kHz indicates an excellent temperature and frequency stability of dielectric behaviors. XRD, FE-SEM and element mapping are conducted to confirm the secondary phases and element line scanning is used to explore the elemental composition of secondary phases. Testing results indicate that optimized dopants can enhance dielectric properties well, while secondary phases induced by x˃5% dopants can cause adverse effects on dielectric properties. XPS results further demonstrate that the defect-dipole theory may be suitable to explain the significant improvement of dielectric properties. We believe that (Pr, Nb)TiO2 ceramics are one of the most competitive candidates in the field of electronic and energy-storage devices.

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Publication details

The article was received on 24 May 2018, accepted on 06 Aug 2018 and first published on 07 Aug 2018


Article type: Communication
DOI: 10.1039/C8CP03304H
Citation: Phys. Chem. Chem. Phys., 2018, Accepted Manuscript
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    Reduced Dielectric Loss in New Colossal Permittivity (Pr, Nb)TiO2 Ceramics by Suppressing Adverse Effects of Secondary Phases

    Z. Liu, C. Zhao, B. Wu and J. Wu, Phys. Chem. Chem. Phys., 2018, Accepted Manuscript , DOI: 10.1039/C8CP03304H

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