Hopping type of conduction in (Na0.5Bi0.5)ZrO3 ceramic

Prasad, K.; Lily,; Kumari, Khushboo; Yadav, K. L.

doi:10.1016/j.jpcs.2007.03.023

Cited by 28 publications

(14 citation statements)

References 16 publications

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“…The analysis resulting from the program revealed that the material possessed orthorhombic perovskite structure. This was in agreement with the previous report 3,4 . The space group of BNZ was Pnma and its lattice parameters were a = 5.7742Å, tered at 900°C where x = 0, 2, 3, 4, and 6 wt% are shown in Fig.…”

Section: Resultssupporting

confidence: 94%

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Jaiban¹,

Jiansirisomboon²,

Watcharapasorn³

2011

ScienceAsia

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Lead-free bismuth sodium zirconate (BNZ) ceramics with formula Na 0.5 Bi 0.5 ZrO 3 /xBi 2 O 3 with x = 0, 2, 3, 4, and 6 wt% were prepared by liquid-phase sintering method. The specimens were sintered at 850 and 900°C. Phase identification was investigated using X-ray diffraction technique. BNZ/4 wt% Bi 2 O 3 and BNZ/6 wt% Bi 2 O 3 ceramics sintered at 900°C showed impurity phase of Bi 7.38 Zr 0.62 O 12.31 compound due to excess additive reacted with zirconium in system. Scanning electron microscopy and energy-dispersive X-ray spectroscopy were employed to study microstructure and measure chemical composition of ceramics, respectively. The results revealed creation of bismuth oxide liquid phase at BNZ grain boundaries inhibited grain growth and decreased pore size. This caused the relative densities of the modified samples to increase.

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Section: Resultssupporting

confidence: 94%

“…Recently, Bi 0.5 Na 0.5 ZrO 3 ceramic (BNZ) was successfully fabricated 3,4 . The novel material promotes interesting dielectric properties including the diffuse phase transition at high temperature (T c ≈ 425°C).…”

Section: Introductionmentioning

confidence: 99%

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Jaiban¹,

Jiansirisomboon²,

Watcharapasorn³

2011

ScienceAsia

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“…The figure clearly shows that the peak frequency shifts towards higher frequency region as it moves from Z to M . The mismatch between the peaks of these two parameters gives an evidence for the existence of two polarization (grain and grain boundary) phenomena [39]. In general, the overlapping of the two peaks is an evidence of long-range conductivity [40].…”

Section: Sample (Grain Size In Nm)mentioning

confidence: 99%

Electrical and magnetic behaviour of nanostructured MgFe2O4 spinel ferrite

Sivakumar¹,

Narayanasamy²,

Grenèche³

et al. 2010

Journal of Alloys and Compounds

112

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“…However, the frequency-dependent region indicates a nonrandom process, wherein the ions perform correlated forward-backward motion. The switch from the frequency independent to the frequency-dependent regions shows the onset of the conductivity relaxation phenomenon which indicates the translation from long-range hopping to the shortrange cluster motion [18]. Further, the electrical conductivity of the materials due to localized states is expressed as a power law [19,20]:…”

Section: Conductivity Studymentioning

confidence: 99%

Studies on Electric and Dielectric Properties of Porous Sm_0.5Sr_0.5CoO_3−δ

Pawar

Shinde

Bhosale

et al. 2013

Journal of Materials

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Frequency-dependent electric and dielectric properties of the porous Sm0.5Sr0.5CoO3−δ cathode prepared through conventional combustion synthesis technique were studied in the temperature range 298 K–973 K. The crystal symmetry, space group, and unit cell dimensions were confirmed by analyzing XRD pattern. XRD analysis indicates the formation of a single-phase orthorhombic structure with space group Pnma 62. Scanning electron microscopy technique was used to examine the morphology of the sample. Scanning electron microscopy study showed the formation of porous structure with an average grain size about 850 nm. From the electrical study, it is observed that the conduction in Sm0.5Sr0.5CoO3−δ sample takes place through the hopping mechanism and follows the inverse universal power law. The correlated barrier hopping model was employed successfully to explain the mechanism of charge transport in Sm0.5Sr0.5CoO3−δ. Further, the ac conductivity data was used to evaluate the minimum hopping length and apparent activation energy. The minimum hopping length was found to be ~10−4 times smaller than the grain size of Sm0.5Sr0.5CoO3−δ. The peaking behaviour of the real part of dielectric constant with frequency was explained using the Rezlescu model. This study helps to confirm that the charge transportation in Sm0.5Sr0.5CoO3−δ is due to two types of charge carriers.

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Hopping type of conduction in (Na0.5Bi0.5)ZrO3 ceramic

Cited by 28 publications

References 16 publications

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Electrical and magnetic behaviour of nanostructured MgFe2O4 spinel ferrite

Studies on Electric and Dielectric Properties of Porous Sm_0.5Sr_0.5CoO_3−δ

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Hopping type of conduction in (Na0.5Bi0.5)ZrO3 ceramic

Cited by 28 publications

References 16 publications

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Untitled

Electrical and magnetic behaviour of nanostructured MgFe2O4 spinel ferrite

Studies on Electric and Dielectric Properties of Porous Sm0.5Sr0.5CoO3−δ

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Studies on Electric and Dielectric Properties of Porous Sm_0.5Sr_0.5CoO_3−δ