Temperature-dependent analysis of dielectric behaviour of Co3O4/NiO nanocomposites with varying NiO concentration.
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| Title: | Temperature-dependent analysis of dielectric behaviour of Co |
|---|---|
| Authors: | Gupta, Jhalak1 (AUTHOR), Ahmed, Arham Shareef1 (AUTHOR) arhamshareef@gmail.com |
| Source: | Journal of Materials Science: Materials in Electronics. Nov2022, Vol. 33 Issue 31, p24182-24207. 26p. |
| Subjects: | Behavioral assessment, Permittivity, Nanocomposite materials, Binding energy, Fermi level, Polarons, Ionic conductivity, Dielectric relaxation, Dielectric loss |
| Abstract: | In the present study, we report the dielectric, impedance, modulus and conductivity study of Co3O4, NiO & Co3O4-NiO nanocomposites with varying NiO concentration (10%, 40%). XRD analysis suggests crystalline phases of pure NiO, Co3O4 and the nanocomposite samples. The crystallite size was calculated using SSP method. The analysis of experimental results indicate that dielectric constant (ε′), dielectric loss factor (tan δ) and a.c. conductivity σac(ω) are temperature, frequency and concentration dependent. It was found that while dielectric constant is an increasing function of temperature, it decreases with increasing frequency. The activation energy (Ea) of the ac conduction have been found between 0.085 and 0.13 eV for all the samples. To discuss the conduction mechanism, the AC conductivity and temperature dependence of frequency exponent 's' have been analysed based on Correlated Barrier Hopping (CBH) and Non-Overlapping Small Polaron tunneling (NSPT) model. Simultaneously, correlated AC conductivity data with CBH & NSPT model were used to calculate the value of maximum barrier height (binding energy) (Wm), AC activation energy, tunnelling distance (Rw) and density of states at Fermi level N (EF). The Nyquist plot from complex impedance spectrum shows only one semicircular arc representing the grain boundary effect in the electrical conduction. The modulus mechanism indicates the non-Debye type of conductivity relaxation in the material, which is supported by impedance data. The variation of AC conductivity as function of temperature indicates that the conduction is due to thermally activated charge carriers. [ABSTRACT FROM AUTHOR] |
| Copyright of Journal of Materials Science: Materials in Electronics is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
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| Header | DbId: egs DbLabel: Engineering Source An: 160255019 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Temperature-dependent analysis of dielectric behaviour of Co<subscript>3</subscript>O<subscript>4</subscript>/NiO nanocomposites with varying NiO concentration. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Gupta%2C+Jhalak%22">Gupta, Jhalak</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ahmed%2C+Arham+Shareef%22">Ahmed, Arham Shareef</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> arhamshareef@gmail.com</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Journal+of+Materials+Science%3A+Materials+in+Electronics%22">Journal of Materials Science: Materials in Electronics</searchLink>. Nov2022, Vol. 33 Issue 31, p24182-24207. 26p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Behavioral+assessment%22">Behavioral assessment</searchLink><br /><searchLink fieldCode="DE" term="%22Permittivity%22">Permittivity</searchLink><br /><searchLink fieldCode="DE" term="%22Nanocomposite+materials%22">Nanocomposite materials</searchLink><br /><searchLink fieldCode="DE" term="%22Binding+energy%22">Binding energy</searchLink><br /><searchLink fieldCode="DE" term="%22Fermi+level%22">Fermi level</searchLink><br /><searchLink fieldCode="DE" term="%22Polarons%22">Polarons</searchLink><br /><searchLink fieldCode="DE" term="%22Ionic+conductivity%22">Ionic conductivity</searchLink><br /><searchLink fieldCode="DE" term="%22Dielectric+relaxation%22">Dielectric relaxation</searchLink><br /><searchLink fieldCode="DE" term="%22Dielectric+loss%22">Dielectric loss</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: In the present study, we report the dielectric, impedance, modulus and conductivity study of Co3O4, NiO & Co3O4-NiO nanocomposites with varying NiO concentration (10%, 40%). XRD analysis suggests crystalline phases of pure NiO, Co3O4 and the nanocomposite samples. The crystallite size was calculated using SSP method. The analysis of experimental results indicate that dielectric constant (ε′), dielectric loss factor (tan δ) and a.c. conductivity σac(ω) are temperature, frequency and concentration dependent. It was found that while dielectric constant is an increasing function of temperature, it decreases with increasing frequency. The activation energy (Ea) of the ac conduction have been found between 0.085 and 0.13 eV for all the samples. To discuss the conduction mechanism, the AC conductivity and temperature dependence of frequency exponent 's' have been analysed based on Correlated Barrier Hopping (CBH) and Non-Overlapping Small Polaron tunneling (NSPT) model. Simultaneously, correlated AC conductivity data with CBH & NSPT model were used to calculate the value of maximum barrier height (binding energy) (Wm), AC activation energy, tunnelling distance (Rw) and density of states at Fermi level N (EF). The Nyquist plot from complex impedance spectrum shows only one semicircular arc representing the grain boundary effect in the electrical conduction. The modulus mechanism indicates the non-Debye type of conductivity relaxation in the material, which is supported by impedance data. The variation of AC conductivity as function of temperature indicates that the conduction is due to thermally activated charge carriers. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Journal of Materials Science: Materials in Electronics is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1007/s10854-022-09119-3 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 26 StartPage: 24182 Subjects: – SubjectFull: Behavioral assessment Type: general – SubjectFull: Permittivity Type: general – SubjectFull: Nanocomposite materials Type: general – SubjectFull: Binding energy Type: general – SubjectFull: Fermi level Type: general – SubjectFull: Polarons Type: general – SubjectFull: Ionic conductivity Type: general – SubjectFull: Dielectric relaxation Type: general – SubjectFull: Dielectric loss Type: general Titles: – TitleFull: Temperature-dependent analysis of dielectric behaviour of Co3O4/NiO nanocomposites with varying NiO concentration. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Gupta, Jhalak – PersonEntity: Name: NameFull: Ahmed, Arham Shareef IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 11 Text: Nov2022 Type: published Y: 2022 Identifiers: – Type: issn-print Value: 09574522 Numbering: – Type: volume Value: 33 – Type: issue Value: 31 Titles: – TitleFull: Journal of Materials Science: Materials in Electronics Type: main |
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