Dielectric relaxation properties of PbTiO3-multiwalled carbon nanotube composites prepared by a sol–gel process

Kwak, Jin Ho; Kang, Sin Wook; Johnson, Trent; Bu, Sang Don

doi:10.1016/j.ceramint.2016.02.023

Cited by 10 publications

(3 citation statements)

References 17 publications

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“…High dielectric constant value verifies the pyrochlore-free characterization results for cobalt doped material. Besides, the parameters obtained in this study are in good agreement with the literature for doped and composite PbTiO 3 based ceramics [ 10 , 50 , 51 ]. Co 3 O 4 phase seems to enhance the dielectric constant.…”

Section: Resultssupporting

confidence: 88%

Detailed structure analyses on Cobalt doped PbTiO3 powders

ERÜNAL¹

2022

Turkish Journal of Chemistry

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The identification of the defects and secondary phases which significantly affect the material properties are of crucial importance. In this study, a systematic structure examination of PbTiO 3 and cobalt doped PbTiO 3 powder ceramics was carried out. X-ray diffraction (XRD), Fourier-transform infrared (FT-IR), Raman, and electron paramagnetic resonance (EPR) spectroscopies were applied along with nonsimultaneous thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). The doped and undoped PbTiO 3 materials were synthesized via a practical sol-gel route that takes place at 50 ° C. The perovskite formation for both materials was verified. The dislocation density of cobalt doped PbTiO 3 was found to be 0.0121 nm −2 while it was 0.00239 nm −2 for the undoped material. Besides, a strong strain effect was observed for cobalt doped PbTiO 3 via XRD. This was attributed to the Co 3 O 4 phase which was detected through EPR and FT-IR analyses. The formation of the Co 3 O 4 phase during synthesis revealed the previously unexpected nonimproved ferroelectric behavior for cobalt doped PbTiO 3 . The dielectric constant and the dielectric loss (tan δ) of cobalt doped PbTiO 3 were estimated as 1066 and 0.8370, respectively.

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Section: Resultssupporting

confidence: 88%

Detailed structure analyses on Cobalt doped PbTiO3 powders

ERÜNAL¹

2022

Turkish Journal of Chemistry

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“…These trapped charges can maximise the interface polarisation effect between the CGO and the CNT, further enhancing the dielectric response compared to the pure CGO and GO composite. 39…”

Section: Resultsmentioning

confidence: 99%

“…Since this interface effect is closely related to the surface charge, it plays an essential role in increasing the material's dielectric constant. 53,54 This increase is explained by a mini-capacitor model consisting of a high capacitance ceramic and a conductive filler. 55,56 CNT with high conductivity is believed to form CGO exhibiting a higher dielectric constant and electrostrictive coefficient than pristine CGO and CGO–GO.…”

Section: Resultsmentioning

confidence: 99%

Enhanced electromechanical properties in low-temperature gadolinium-doped ceria composites with low-dimensional carbon allotropes

et al. 2022

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Hydrothermal Synthesis and Phase‐, Morphology‐Evolution Mechanism of Lead Titanate Nanostructures Assisted with Tetramethylammonium Hydroxide

Bao

et al. 2017

Chin. J. Chem.

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Lead titanate nanostructures with different phases and morphologies, layered hexagonal PbTiO 2 (CO 3 ) 0.3 -(NO 3 ) 0.35 (OH) nanosheets, pyrochlore Pb 2 Ti 2 O 6 nanodendites, pre-perovskite PbTiO 3 nanofibres and perovskite PbTiO 3 nanoplates, have been synthesized via a conventional hydrothermal route assisted with different concentrations of tetramethylammonium hydroxide (TMAH). X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and high-resolution TEM (HRTEM) were employed to characterize the phase, morphology and growth behavior of the synthesized samples. The results reveal that at low TMAH concentration the obtained samples are mainly of PbTiO 2 (CO 3 ) 0.3 (NO 3 ) 0.35 (OH) nanosheets. With the TMAH concentration increasing, the obtained samples change to pyrochlore Pb 2 Ti 2 O 6 nanodendites, pre-perovskite PbTiO 3 nanofibres and perovskite PbTiO 3 nanoplates in turn. With the basis of the experimental results, the phase-and morphology-evolution mechanism of the lead titanate nanostructures is discussed by combining the analysis of the lattice structure feature and the properties of TMAH.

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Dielectric relaxation properties of PbTiO3-multiwalled carbon nanotube composites prepared by a sol–gel process

Cited by 10 publications

References 17 publications

Detailed structure analyses on Cobalt doped PbTiO3 powders

Detailed structure analyses on Cobalt doped PbTiO3 powders

Enhanced electromechanical properties in low-temperature gadolinium-doped ceria composites with low-dimensional carbon allotropes

Hydrothermal Synthesis and Phase‐, Morphology‐Evolution Mechanism of Lead Titanate Nanostructures Assisted with Tetramethylammonium Hydroxide

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