Nonlinear Behavior in the Electrical Resistance of Strongly Correlated Insulators

Katsufuji, T.; Ikeda, Hiroaki; Ashizawa, Misa; Oike, Michiyo; Kajita, T.

doi:10.7566/jpsj.89.044702

Cited by 3 publications

(6 citation statements)

References 33 publications

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“…The observed non‐linear curves indicate that the conduction in these composites is not purely electronic but is influenced by different possible factors such as temperature, induced ionization, phonon migration, and induced ionic conduction. [ 50–52 ] This nonohmic trend is generally encountered in diodes, thermistors, heated filaments, and PV cells. Recently, Katsufuji et al addressed the non‐linear behaviour of resistance in various disordered systems and reported that the resistivity decreases as a function of current density/electric field but does not rely on the temperature or the materials.…”

Section: Resultsmentioning

confidence: 99%

“…Recently, Katsufuji et al addressed the nonlinear behaviour of resistance in various disordered systems and reported that the resistivity decreases as a function of current density/electric field but does not rely on the temperature or the materials. [51] They discussed their observations in the light of the percolation conduction theory in disordered systems. [51] Here, the non-linearity of the I-V curves was analyzed by taking the logarithmic form as described by Equations ( 5) and ( 6) where I, V, α, and G are the current, voltage, ohmicity, and conductance (G = σ Â area/ thickness), respectively.…”

Section: Electrical Conductivity (σ)mentioning

confidence: 99%

“…[51] They discussed their observations in the light of the percolation conduction theory in disordered systems. [51] Here, the non-linearity of the I-V curves was analyzed by taking the logarithmic form as described by Equations ( 5) and ( 6) where I, V, α, and G are the current, voltage, ohmicity, and conductance (G = σ Â area/ thickness), respectively. [52] The α can be estimated from the slope of Ln (I) À Ln (V) linear plots, where the obtained values (α = 1.76-1.23) show substantial deviation from unity (α = 1) of pure electronic conduction, thus indicating higher ionic/mass diffusion in Ni 0 :Ni-BO 3 , Table 4.…”

Section: Electrical Conductivity (σ)mentioning

confidence: 99%

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Thermoelectric performance of Ni, Co, and Fe nanoparticles incorporated into their metal borates glassy matrices

2022

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Here, we present our current attempt to intrinsically dope Ni 0 , Co 0 , and Fe 0 nanoparticles within Ni II -, Co II -, and Fe II -borate glassy matrices, respectively. The system was prepared by one-pot reaction of the desired M T II salt with excess NaBH 4 through an in-situ reduction and hydrolysis processes to afford metallic M T 0 nanoparticles dispersed into the M T -BO 3 matrix. The composition and structural characteristics of these M T 0 :M T -BO 3 materials were identified by thermal oxidation, ATR-IR, X-ray powder diffraction, and magnetic techniques as glassy/amorphous borate matrices containing magnetic nanoparticles. The electrical conductivity (σ) of cold-pressed discs of these metal-doped composites shows that they behave as nonohmic semiconductors within the temperature range of 303 ≤ T ≤ 373 K suggesting a mixed electronic-ionic conduction. However, their thermal conductivity (κ) occurs through phonon lattice vibration dynamics rather than electronic. The σ/κ ratio shows a steep non-linear increase from 9.4 to 270 KV À2 in Ni 0 :Ni-BO 3 . In contrast, a moderate-weak increase is observed for Co 0 :Co-BO 3 and Fe 0 :Fe-BO 3 analogs. The obtained materials are examined for thermoelectric (TE) applications by determining their Seebeck coefficient (S) power factor (PF), figure of merit (ZT), and conversion efficiency (η%). All the TE data shows that Ni 0 :Ni-BO 3 (S, 80 μVK À1 ; PF, 97.7 mWm À1 K À1 ; ZT 0.54; η, 2.15%) is a better TE semiconductor than the other two M T 0 :M T -BO 3 . This finding shows that Ni 0 :Ni-BO 3 is a promising candidate to exploit low-temperature waste heat from body heat, sunshine, and small domestic devices for small-scale TE applications.

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Section: Resultsmentioning

confidence: 99%

Section: Electrical Conductivity (σ)mentioning

confidence: 99%

Section: Electrical Conductivity (σ)mentioning

confidence: 99%

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Thermoelectric performance of Ni, Co, and Fe nanoparticles incorporated into their metal borates glassy matrices

2022

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“…This behavior can be attributed to various parameters, the most important of which are the temperature, current density, the time over which the electric field is applied, not to ignore the contribution of the induced ionic conduction [52,53]. Recently, Katsufuji etal.…”

Section: Electrical Conductivity (σ)mentioning

confidence: 99%

“…addressed the nonlinear behavior of resistance in various disordered systems and reported that the resistivity decreases as a function of current density /electric field but does not rely on the temperature or the materials. They discussed their observation in the light of the percolation conduction theory in disordered systems [53].…”

Section: Electrical Conductivity (σ)mentioning

confidence: 99%

Solid-state Thermoelectric Characteristics of NiII, FeII, CoII, and CuII Borohydrides

Arafa

Shatnawi

Obeidallah

et al. 2021

Preprint

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Four transition metal borohydrides (MTBHs, MT = Ni, Fe, Co, and Cu) were prepared by sonicating a mixture of the desired MT salt with excess NaBH4 in a nonaqueous DMF/CH3OH media. The process afforded bimetallic (Ni-BH4), trimetallic (Fe-BH4, Co-BH4), and mixed-valence (Cu-H, Cu-BH4) amorphous, ferromagnetic nanoparticles as identified by thermal, ATR-IR, X-Ray diffraction, and magnetic susceptibility techniques. The electrical conductivity (σ) of cold-pressed discs of these MTBHs shows a nonlinear increase while their thermal conductivity (κ) decreases in the temperature range of 303 ≤ T ≤ 373 K. The thermal energy transport occurs through phonon lattice dynamics rather than electronic. The σ/κ ratio shows a nonlinear steep increase from 9.4 to 270 KV-2 in Ni-BH4, while a moderate-weak increase is observed for Fe-BH4, Co-BH4, and Cu-BH4. Accordingly, the corresponding thermoelectric (TE) parameters S, PF, ZT, and η were evaluated. All TE data shows that the bimetallic Ni-BH4 (S, 80 μVK-1; PF, 259 μWm-1K-2; ZT 0.64; η, 2.56%) is a better TE semiconductor than the other three MT-BHs investigated in this study. Our findings show that Ni-BH4 is a promising candidate to exploit low-temperature waste heat from body heat, sunshine, and small domestic devices for small-scale TE applications.

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Discussing Intrinsic Physics by Measuring Nonlinear Conduction Impossible for Oxides

Maeda

2020

JPSJ News Comments

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Nonlinear Behavior in the Electrical Resistance of Strongly Correlated Insulators

Cited by 3 publications

References 33 publications

Thermoelectric performance of Ni, Co, and Fe nanoparticles incorporated into their metal borates glassy matrices

Thermoelectric performance of Ni, Co, and Fe nanoparticles incorporated into their metal borates glassy matrices

Solid-state Thermoelectric Characteristics of NiII, FeII, CoII, and CuII Borohydrides

Discussing Intrinsic Physics by Measuring Nonlinear Conduction Impossible for Oxides

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