The electrical properties of Mn3O4-doped ZnO

Hong, Younwoo; Kim, J.H.

doi:10.1016/j.ceramint.2003.12.028

Cited by 40 publications

(11 citation statements)

References 6 publications

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“…In addition, the doped ZnO with 5 wt% TiO 2 has an activation energy very near to 0.1 eV, which is assigned to neutral (O i + ) positively charged oxygen interstitial (O i 1+ ) . However, for the 7 wt% TiO 2 content, E a value is about 0.36 eV, which is related to the oxygen vacancy . With respect to the higher temperatures, the activation energies are found to be between 0.70 and 1.09 eV, which may be related to the MWS polarization occurring at the grain interfaces .…”

Section: Resultsmentioning

confidence: 93%

Structural, electric modulus and complex impedance analysis of ZnO/TiO₂ composite ceramics

Belgacem¹,

Chaari²,

Braña

et al. 2017

J Am Ceram Soc

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ZnO/TiO2 composite ceramics have been prepared by solid‐state reaction technique at 900°C. The X‐ray diffraction results revealed the formation of secondary phases referred to as spinel Zn2TiO4 and hexagonal ZnTiO3. The structural analysis showed that all the composites that have been prepared have a polycrystalline nature and a hexagonal wurtzite structure. The complex modulus (M) and electric impedance of the samples have been investigated by broadband dielectric spectroscopy in a wide range of temperature (40°C‐110°C) and frequency (0.1 Hz to 10 MHz). The modulus plots (M′′, M′) illustrate the presence of non‐Debye type of relaxations attributed to the effects of interfacial and dipolar polarizations. The real and the imaginary parts of the impedance are well fitted to equivalent circuit models. At high temperatures, Z″max varies from 0.03 × 106 to 4.9 × 106 Ω when the TiO2 doping concentration increases from 1 to 7 wt%. From the obtained results, the secondary phase ZnTiO3 plays an important role in the electrical properties.

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Section: Resultsmentioning

confidence: 93%

Structural, electric modulus and complex impedance analysis of ZnO/TiO₂ composite ceramics

Belgacem¹,

Chaari²,

Braña

et al. 2017

J Am Ceram Soc

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“…The temperature variation for pristine and x = 0.01 gives a straight‐line variation with E a = 0.33 and 0.09 eV, respectively. The value of 0.33 eV confirms the presence of oxygen vacancies (V o ) , whereas the value of 0.09 eV which is close to 0.1 eV is associated to oxygen interstitials

O_{normali}^{-}

and

O_{normali}^{+}

. For x = 0.02 and x = 0.03 the plots show 2 straight lines with lower temperature activation energies being equal to 0.41 and 0.25 eV which corresponds to oxygen vacancies V o and Zn 2+ or Zn i with respect to high‐temperature activation energy which lies between 1.41 and 1.16 eV.…”

Section: Ac Conductivitymentioning

confidence: 81%

Effect of dilute concentrations of Sm on the temperature‐dependent electrical and dielectric properties of ZnO

Arora

Kumar²,

Kaur

et al. 2018

J Am Ceram Soc

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Compounds of undoped and samarium (Sm) doped ZnO have been prepared by standard solid‐state reaction method. X‐ray diffraction (XRD), Williamson‐Hall (W‐H) analysis, Transmission Electron Microscopy (TEM), temperature‐dependent electrical and dielectric studies have been done to characterize these materials. Inclusion of Sm as dopant in hexagonal wurtzite ZnO changes the lattice parameters to a small extent with some Sm aggregation at higher concentration. Also, the mean particle sizes of ZnO:Sm compounds showed an inter‐correlation with the Scherrer method, W‐H analysis as well as with TEM results. The electrical resistivity depicts an exponential decay and metal‐semiconductor transition (MST) at ~300 K for the pristine sample whereas there is large decrement in the resistivity with Sm doping. The analysis of σac of ZnO suggests that the power law is obeyed and indicated an increase in the ac conductivity with Sm content. The mechanism behind this type of conductivity is elucidated by small polaron tunneling (SPT) model of conductivity. The dependence of ln dc on the temperature inverse shows that the traps of electrons are thermally activated such that low and high temperature activation energies confirm the presence of vacancies and interstitials of both O and Zn ions. Thus, a high value of dielectric constant makes these materials suitable for high frequency and charge storage device applications.

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“…Such an approach has a high potential of development since the versatility of the synthetic approach allows the addition of other oxides known to improve varistor nonlinearity (Co, Mn, etc.). [51][52][53][54] This work may open new ways for the elaboration of nanodevices.…”

Section: Discussionmentioning

confidence: 99%

Size Effect on Properties of Varistors Made From Zinc Oxide Nanoparticles Through Low Temperature Spark Plasma Sintering

Macary

Kahn

Estournès

et al. 2009

Adv Funct Materials

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Conditions for the elaboration of nanostructured varistors by spark plasma sintering (SPS) are investigated, using 8‐nm zinc oxide nanoparticles synthesized following an organometallic approach. A binary system constituted of zinc oxide and bismuth oxide nanoparticles is used for this purpose. It is synthesized at room temperature in an organic solution through the hydrolysis of dicyclohexylzinc and bismuth acetate precursors. Sintering of this material is performed by SPS at various temperatures and dwell times. The determination of the microstructure and the chemical composition of the as‐prepared ceramics are based on scanning electron microscopy and X‐ray diffraction analysis. The nonlinear electrical characteristics are evidenced by current–voltage measurements. The breakdown voltage of these nanostructured varistors strongly depends on grain sizes. The results show that nanostructured varistors are obtained by SPS at sintering temperatures ranging from 550 to 600 °C.

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The electrical properties of Mn3O4-doped ZnO

Cited by 40 publications

References 6 publications

Structural, electric modulus and complex impedance analysis of ZnO/TiO₂ composite ceramics

Structural, electric modulus and complex impedance analysis of ZnO/TiO₂ composite ceramics

Effect of dilute concentrations of Sm on the temperature‐dependent electrical and dielectric properties of ZnO

Size Effect on Properties of Varistors Made From Zinc Oxide Nanoparticles Through Low Temperature Spark Plasma Sintering

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The electrical properties of Mn3O4-doped ZnO

Cited by 40 publications

References 6 publications

Structural, electric modulus and complex impedance analysis of ZnO/TiO2 composite ceramics

Structural, electric modulus and complex impedance analysis of ZnO/TiO2 composite ceramics

Effect of dilute concentrations of Sm on the temperature‐dependent electrical and dielectric properties of ZnO

Size Effect on Properties of Varistors Made From Zinc Oxide Nanoparticles Through Low Temperature Spark Plasma Sintering

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Product

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Structural, electric modulus and complex impedance analysis of ZnO/TiO₂ composite ceramics

Structural, electric modulus and complex impedance analysis of ZnO/TiO₂ composite ceramics