Phase evolution, dielectric and impedance spectroscopic study of SrNb2O6 columbite phase

Pastor, Mukul; Goenka, Shilpi; Maiti, Suman; Biswas, Koushik; Manna, I.

doi:10.1016/j.ceramint.2009.12.013

Cited by 13 publications

(2 citation statements)

References 20 publications

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“…In the literature, various densities of ceramic columbites from 81 to 90% are given, 1,4 but a significant increase in density up to 97% is observed with the addition of dopant. 6,36 The closed porosity (porosity in tablet volume) of the pure MNO, CNO, and ZNO synthesized by us was 8%-13% (Table S3), and an decrease in porosity by 5% is visible in the example of titanium-doped MNO samples. Previously, we were able to increase the density of MNO by adding copper additives, but such samples became mixed conductors.…”

Section: Resultsmentioning

confidence: 97%

Exhaustive Study of Electrical Conductivity in the MNb_2−xTixO_6–0.5x (M = Mg, Ca, Zn; x = 0, 0.1, 0.2) Columbites

Morkhova,

Koroleva,

Egorova

et al. 2024

ECS Adv.

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The CaNb2O6 and ZnNb2O6 columbites (Sp.gr. Pbcn) were studied as oxygen ion conductors both theoretically and experimentally. A theoretical approach included geometrical-topological analysis, bond valence site energy (BVSE) and density functional theory (DFT) calculations. The BVSE approach showed the possibility of pure oxygen ions diffusion with migration energies less than 0.45 eV in both compounds. However, DFT calculations indicated the possibility of diffusion of both anions and cations. The single-phases columbites were synthesized by the Pechini method for accurately determine charge carriers type and investigated by impedance spectroscopy, by the Tubandt method, which confirmed the absence of cationic conductivity, and measured the electrical conductivity as a function of oxygen partial pressures. The CaNb2O6 sample had the pure oxygen-ionic conductivity ∼2×10-6 S cm–1 at 800 °C (Ea = 0.82 eV), while the ZnNb2O6 had a similar conductivity value due to mixed ionic-electronic contribution (Ea = 0.83 eV). The electromotive force method also showed the predominance of the ionic type of conductivity in CaNb2O6, while ZnNb2O6 has a mixed conductivity with ion transport number of about 0.4. Additionally, we synthesized Ti-doped samples MNb2-xTixO6-0.5x (M = Mg, Ca; x = 0.1, 0.2) to study the doping effect on conducting properties.

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Section: Resultsmentioning

confidence: 97%

Exhaustive Study of Electrical Conductivity in the MNb_2−xTixO_6–0.5x (M = Mg, Ca, Zn; x = 0, 0.1, 0.2) Columbites

Morkhova,

Koroleva,

Egorova

et al. 2024

ECS Adv.

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“…8a) observed is corresponding to grain and grain boundary effects implying the identical time constant. The arcs are found to be highly depressed in the case of 175 °C and 250 °C due to the distribution of relaxation times which is a serious combintation of consstant phase elements (CPE) parallel with grain and grain boundary resistance [8]. As the measuring temperature is at 250 °C, the high frequency part of semicircle decreases and merges with low frequency part of the semicircle.…”

Section: Fig 5a and 5b Low And High Magnified Sem Images Of H-moomentioning

confidence: 99%

Microwave Assisted Ultra Fast Synthesis of 1-D Molybdenum Oxide Nanocrystals: Structural and Electrical Studies

Chithambararaj¹,

Bose²

2012

AMR

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Molybdenum oxide (MoO3) is a well known transition metal oxide with multi phase properties that permit novel applications in sensors and batter systems. In this paper, we report a new approach to synthesize meta-stable structured molybdenum oxide (MoO3) by microwave assisted solution precipitation method using a domestic microwave oven. The reaction is carried out in a short period of 5 min. The XRD results confirms that the powder exhibits single phase hexagonal MoO3 with lattice parameter a= 10.53 Å and c = 14.907 Å. SEM images show, the particles are one dimensional (1-D) structure with hexagonal cross section and EDX spectrum confirm that the particles comprise of only molybdenum and oxygen. Further, the thermal and electrical properties are investigated by thermo gravimetric and impedance analysis and the results are discussed.

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Structural, thermal, optical and dielectric studies of V2O5@WO3 nanocomposites prepared by microwave-assisted hydrothermal method

Periasamy¹,

Krishnakumar²,

Selvakumar

et al. 2021

Appl. Phys. A

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Phase evolution, dielectric and impedance spectroscopic study of SrNb2O6 columbite phase

Cited by 13 publications

References 20 publications

Exhaustive Study of Electrical Conductivity in the MNb_2−xTixO_6–0.5x (M = Mg, Ca, Zn; x = 0, 0.1, 0.2) Columbites

Exhaustive Study of Electrical Conductivity in the MNb_2−xTixO_6–0.5x (M = Mg, Ca, Zn; x = 0, 0.1, 0.2) Columbites

Microwave Assisted Ultra Fast Synthesis of 1-D Molybdenum Oxide Nanocrystals: Structural and Electrical Studies

Structural, thermal, optical and dielectric studies of V2O5@WO3 nanocomposites prepared by microwave-assisted hydrothermal method

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Phase evolution, dielectric and impedance spectroscopic study of SrNb2O6 columbite phase

Cited by 13 publications

References 20 publications

Exhaustive Study of Electrical Conductivity in the MNb2−x TixO6–0.5x (M = Mg, Ca, Zn; x = 0, 0.1, 0.2) Columbites

Exhaustive Study of Electrical Conductivity in the MNb2−x TixO6–0.5x (M = Mg, Ca, Zn; x = 0, 0.1, 0.2) Columbites

Microwave Assisted Ultra Fast Synthesis of 1-D Molybdenum Oxide Nanocrystals: Structural and Electrical Studies

Structural, thermal, optical and dielectric studies of V2O5@WO3 nanocomposites prepared by microwave-assisted hydrothermal method

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Exhaustive Study of Electrical Conductivity in the MNb_2−xTixO_6–0.5x (M = Mg, Ca, Zn; x = 0, 0.1, 0.2) Columbites

Exhaustive Study of Electrical Conductivity in the MNb_2−xTixO_6–0.5x (M = Mg, Ca, Zn; x = 0, 0.1, 0.2) Columbites