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Correlation between...
Correlation between reduced dielectric loss and charge migration kinetics in NdFeO3-modified Ba0.7Sr0.3TiO3 ceramics
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- Kaur, A. (författare)
- Guru Nanak Dev Univ, Dept Phys, Amritsar 143005, Punjab, India.,Inter Univ Accelerator Ctr, Aruna Asaf Ali Marg, New Delhi 110067, India.
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- Singh, Deobrat (författare)
- Uppsala universitet,Materialteori
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- Das, A. (författare)
- Inst Plasma Res, Atmospher Plasma Div, Gandhinagar 382428, Gujarat, India.
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- Singh, S. (författare)
- Guru Nanak Dev Univ, Dept Phys, Amritsar 143005, Punjab, India.
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Asokan, K. (författare)
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Singh, L. (författare)
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- Mishra, I. B. (författare)
- Arizona State Univ, Sch Mol Sci, Tempe, AZ 85287 USA.
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- Ahuja, Rajeev, 1965- (författare)
- Uppsala universitet,KTH,Egenskaper,Condensed Matter Theory Group, Materials Theory Division, Department of Physics and Astronomy, Uppsala University, Box 516, 75120, Uppsala, Sweden,Materialteori,Teoretisk fysik,Uppsala Univ, Dept Phys & Astron, Mat Theory Div, Condensed Matter Theory Grp, Box 516, S-75120 Uppsala, Sweden.;Royal Inst Technol KTH, Dept Mat Sci & Engn, Appl Mat Phys, S-10044 Stockholm, Sweden.
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Guru Nanak Dev Univ, Dept Phys, Amritsar 143005, Punjab, India Inter Univ Accelerator Ctr, Aruna Asaf Ali Marg, New Delhi 110067, India. (creator_code:org_t)
- 2021-09-06
- 2021
- Engelska.
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Ingår i: Journal of materials science. Materials in electronics. - : Springer Nature. - 0957-4522 .- 1573-482X. ; 32:20, s. 24910-24929
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Abstract
Ämnesord
Stäng
- The present study demonstrates the reduction in the dielectric loss at room temperature from 0.149 to 0.027 in the composite of (NdFeO3)0.1−(Ba0.7Sr0.3TiO3)0.9 as compared to the undoped Ba0.7Sr0.3TiO3 and correlates with the charge compensation due to the ionic substitutions for both A site (NdBa) and B (FeTi) site generated excess electrons, localized hole states and robust oxygen vacancies (VO) along with different cationic oxidation states. The VO mediated F center charge transfer mechanism i.e., bound magnetic polaronic behaviour and defect complex generated between acceptors and ionized VO reduce electrical conductivity and loss factor. The presence of weak ferromagnetism in the M-H loop reconfirms the F center exchange mechanism in mixed phase symmetry. The activation energy calculated from impedance spectroscopy, electrical modulus and electrical conductivity analysis supports the presence of doubly ionized VO. Further, density functional theory based first principle calculation manifests that the impurity induced depopulation of valence band edge electrons into a single spin up channel which distorts TiO6 octahedra with fluctuating bond length and Ti 3deg orbital splitting observed in decomposed density of states for accommodating excess electrons. These trapped and accommodated electrons reduce the effective electron concentration which in turn decreases the electrical conductivity and loss factor.
Ämnesord
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
Nyckelord
- Activation analysis
- Activation energy
- Binary alloys
- Bond length
- Charge transfer
- Color centers
- Density functional theory
- Dielectric devices
- Dielectric losses
- Electric conductivity
- Electrons
- Ionization
- Cationic oxidation state
- Charge transfer mechanisms
- Effective electrons
- Electrical conductivity
- First principle calculations
- Impedance spectroscopy
- Ionic substitutions
- Weak ferromagnetism
- Strontium compounds
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