Study of dielectric properties of CaCu3Ti4O12 synthesized via different routes: Effect of sintering temperature

Kumari, Neelam; Meena, Shivali; Rathore, Deepshikha; Singhal, Rahul; Dwivedi, Umesh Kumar

doi:10.1016/j.ceramint.2022.09.234

Cited by 23 publications

(9 citation statements)

References 35 publications

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“…It has been revealed that the interfacial polarization due to charge build-up causes the high dielectric constant to peak at low frequencies. When movement of Ti ions becomes arrested, the Debye relaxation behavior causes the dielectric constant to drop at high frequencies [ 36 ]. Cation valence state, oxygen vacancies [ 37 ], and the electrode contact point [ 38 , 39 ] have been associated with the low dielectric constant.…”

Section: Resultsmentioning

confidence: 99%

Effect of Europium Addition on the Microstructure and Dielectric Properties of CCTO Ceramic Prepared Using Conventional and Microwave Sintering

Evangeline

Ctibor

2023

Molecules

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In this work, Eu2O3-doped (CaCu3Ti4O12)x of low dielectric loss have been fabricated using both conventional (CS) and microwave sintering (MWS), where x = Eu2O3 = 0.1, 0.2, and 0.3, respectively. According to X-ray diffraction (XRD) and scanning electron microscope (SEM) reports, increasing the concentration of Eu3+ in the CCTO lattice causes the grain size of the MWS samples to increase and vice versa for CS. The X-ray photoelectron spectroscopy (XPS) delineated the binding energies and charge states of the Cu2+/Cu+ and Ti4+/Ti3+ transition ions. Energy dispersive spectroscopy (EDS) analysis revealed no Cu-rich phase along the grain boundaries that directly impacts the dielectric properties. The dielectric characteristics, which include dielectric constant (ε) and the loss (tan δ), were examined using broadband dielectric spectrometer (BDS) from 10 to 107 Hz at ambient temperature. The dielectric constant was >104 and >102 for CS and MWS samples at x > 0.1, respectively, with the low loss being constant even at high frequencies due to the effective suppression of tan δ by Eu3+. This ceramic of low dielectric loss has potential for commercial applications at comparatively high frequencies.

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Section: Resultsmentioning

confidence: 99%

Effect of Europium Addition on the Microstructure and Dielectric Properties of CCTO Ceramic Prepared Using Conventional and Microwave Sintering

Evangeline

Ctibor

2023

Molecules

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“…This slight shift is due to decrease in overall interplaner spacing “ d ” which is responsible for lowering the intensity of peaks and hence decreases the crystallinity. [ 35 ] CFO nanoparticles show the uniform strain due to shifting in lattice spacing which is calculated by formula [ 36 ] :

k goodbreak= c ([], \frac{d - d ₀}{d ₀}),

where,

k

is uniform strain, d is calculated lattice spacing, and d 0 is standard lattice spacing for crystalline material.…”

Section: Resultsmentioning

confidence: 99%

“…This slight shift is due to decrease in overall interplaner spacing "d" which is responsible for lowering the intensity of peaks and hence decreases the crystallinity. [35] CFO nanoparticles show the uniform strain due to shifting in lattice spacing which is calculated by formula [36] :…”

Section: Characterization Of Compositementioning

confidence: 99%

“…The high value of dielectric constant at low frequency is attributed due to ionic, orientation and interfacial polarization. [35,40] At high frequency regime, the orientation of dipole stopped and electric diploes are unable to follows the rapid alteration of external applied field. [35,[41][42][43] The decrease in dielectric constant is in consistent with Koop's theory and Maxwell Wagner theory.…”

Section: Morphological Propertiesmentioning

confidence: 99%

“…[35,40] At high frequency regime, the orientation of dipole stopped and electric diploes are unable to follows the rapid alteration of external applied field. [35,[41][42][43] The decrease in dielectric constant is in consistent with Koop's theory and Maxwell Wagner theory. [39,44] According to the theory, when ferrites are placed in external applied field the hopping of electrons and holes between Fe 2+ to Fe 3+ ions as result the mobile electrons drift towards the grain boundary and get accumulated in the well due to high resistance at grain boundary consequently, this process results in interfacial polarization.…”

Section: Morphological Propertiesmentioning

confidence: 99%

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Dielectric study of CoFe₂O₄/MWCNT/epoxy nanocomposites: Effect of temperature, concentration and irradiation

et al. 2023

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In this work, dielectric behavior of CoFe2O4/MWCNT/epoxy nanocomposites affected by concentration, temperature and Au ion irradiation is reported. The CoFe2O4 nanoparticles are synthesized via co‐precipitation technique. The samples of CoFe2O4/MWCNT/epoxy nanocomposites are prepared by varying ferrite contents (upto 50 phr). After that, the dielectric behavior is evaluated using LCR meter. The results exhibited that the dielectric constant of CoFe2O4/MWCNT/epoxy nanocomposites increases with increased ferrite content. The effect of temperature on dielectric of CoFe2O4/MWCNT/epoxy nanocomposites is observed at 27–100°C. The dielectric constant of prepared nanocomposites is gradually enhanced with elevation in temperature up to a certain value then decreased due to accumulation of charges at interfaces. Furthermore, reduced dielectric behavior of prepared nanocomposites can be seen on the account of ion irradiation effect.

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Improved dielectric properties of poly(arylene ether nitrile) with sulfonated poly(arylene ether nitrile) modified CaCu₃Ti₄O₁₂

Gao,

Wei,

Zhou

et al. 2023

Polymer Composites

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High‐dielectric and low‐loss materials hold potential for various electronic devices. A prevalent approach to producing high‐dielectric and low‐loss dielectrics is incorporating inorganic ceramic materials with high dielectric constants into a polymeric matrix. However, doping of inorganic ceramic materials results in agglomeration of the inorganic materials and poor interfacial compatibility between the matrix and the dopant, thus limiting their range of application. In this study, sulfonated poly(arylene ether nitrile) (SPEN) functionalized copper calcium titanate (CCTO) (SPEN@CCTO) was synthesized by modifying hydroxylated CCTO with SPEN and then introduced into the PEN matrix offering SPEN@CCTO/PEN. The successful encapsulation of SPEN at CCTO was confirmed through FT‐IR, XRD, and XPS. SEM observation revealed that SPEN@CCTO nanomaterials not only prevented agglomeration of CCTO but also significantly improved interfacial adhesion between the matrix and filler, highlighting the importance of SPEN@CCTO in enhancing the mechanical properties of resulting nanocomposites. Electrostatic permittivity of SPEN@CCTO/PEN and CCTO/PEN composite dielectric materials were evaluated in the frequency range spanning 10 Hz to 1 MHz. In comparison with CCTO/PEN composite dielectric materials, SPEN@CCTO/PEN composites show superior dielectric characteristics, characterized by higher dielectric constants and lower losses in dielectric. The SPEN@CCTO/PEN film's dielectric constant at 10 Hz and electric breakdown strength with 15 wt% SPEN@CCTO were found to be 5.9 and 178.8 kV/mm, respectively. Thereby, the energy storage density of SPEN@CCTO/PEN composite film was calculated to be 0.83 J/cm3. In addition, the excellent mechanical properties of SPEN@CCTO/PEN ensured it as promising flexible dielectric materials in the future.

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Study of dielectric properties of CaCu3Ti4O12 synthesized via different routes: Effect of sintering temperature

Cited by 23 publications

References 35 publications

Effect of Europium Addition on the Microstructure and Dielectric Properties of CCTO Ceramic Prepared Using Conventional and Microwave Sintering

Effect of Europium Addition on the Microstructure and Dielectric Properties of CCTO Ceramic Prepared Using Conventional and Microwave Sintering

Dielectric study of CoFe₂O₄/MWCNT/epoxy nanocomposites: Effect of temperature, concentration and irradiation

Improved dielectric properties of poly(arylene ether nitrile) with sulfonated poly(arylene ether nitrile) modified CaCu₃Ti₄O₁₂

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Study of dielectric properties of CaCu3Ti4O12 synthesized via different routes: Effect of sintering temperature

Cited by 23 publications

References 35 publications

Effect of Europium Addition on the Microstructure and Dielectric Properties of CCTO Ceramic Prepared Using Conventional and Microwave Sintering

Effect of Europium Addition on the Microstructure and Dielectric Properties of CCTO Ceramic Prepared Using Conventional and Microwave Sintering

Dielectric study of CoFe2O4/MWCNT/epoxy nanocomposites: Effect of temperature, concentration and irradiation

Improved dielectric properties of poly(arylene ether nitrile) with sulfonated poly(arylene ether nitrile) modified CaCu3Ti4O12

Contact Info

Product

Resources

About

Dielectric study of CoFe₂O₄/MWCNT/epoxy nanocomposites: Effect of temperature, concentration and irradiation

Improved dielectric properties of poly(arylene ether nitrile) with sulfonated poly(arylene ether nitrile) modified CaCu₃Ti₄O₁₂