Dielectric properties and atomic-scale microstructural characterizations of cubic-pyrochlored ceramics in the system of Bi2O3-MgO-Nb2O5

Xia, Weiren; Xue, Piaojie; Wu, Heng; Lu, Yao; Zhang, Yuan; Zhou, Shujuan; Zhu, Xinhua

doi:10.1016/j.jallcom.2017.01.153

Cited by 20 publications

(14 citation statements)

References 27 publications

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“…This could be due to the long-range ordered structure that enhanced the electric dipole polarizations along the superlattice direction. Meanwhile, the low tan δ, <0.002 below 10 5 Hz could be attributed to the presence of clean grain boundaries that reduced extrinsic tan δ [7]. In other related study, the replacement of Mg by Ni in the Bi 2 O 3 -NiO-Nb 2 O 5 (BNN) system revealed a low-temperature dielectric relaxation behavior, which was typically found in the Bi-pyrochlores.…”

Section: Introductionmentioning

confidence: 79%

Investigation of structural and dielectric properties of subsolidus bismuth iron niobate pyrochlores

Jusoh

Tan

Zainal

et al. 2020

Journal of Asian Ceramic Societies

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Subsolidus Bi 3.36 Fe 2.08+x Nb 2.56−x O 14.56−x (BFN) pyrochlores prepared by solid-state reaction at 950°C over 48 h showed a moderate solid solution range of −0.24 ≤ x ≤ 0.48. As to preserve the overall charge electroneutrality of the system, the doping mechanism was proposed to be a one-to-one substitution of Nb 5+ by Fe 3+ together with oxygen non-stoichiometry, i.e. Nb 5+ ↔ Fe 3+ − O 2-. BFN pyrochlores crystallized in a cubic symmetry, space group Fd � 3m (No. 227), Z = 4 and their refined lattice constants were found to be in the range 10.5071 (4)-10.5107 (7) Å. The microstructural analyses revealed their grain size range 0.5-8.4 μm and crystallite size range 63 −78 nm, respectively. These thermally stable BFN pyrochlores exhibited moderate high dielectric constants, ε' in the range 141-150 and dielectric losses, tan δ ~ 0.2 at ~30°C and 1 MHz.

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Section: Introductionmentioning

confidence: 79%

Investigation of structural and dielectric properties of subsolidus bismuth iron niobate pyrochlores

Jusoh

Tan

Zainal

et al. 2020

Journal of Asian Ceramic Societies

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“…3(a) and (b), the Raman peaks are observed at 149, 200, 237, 290, 343, 448, 612 and 655 cm −1 for NaBi 2 Ta 5 O 16 and at 150, 196, 231, 288, 237, 435, 477, 601 and 658 cm −1 for TlBi 2 Ta 5 O 16 . These observed Raman peaks can be assigned to symmetry species by referencing the previous literatures on diverse pyrochlore oxides [13, 14, 15, 16]. It is noticed that more than six Raman bands (predicted for the ideal pyrochlore structures) are observed, which implies the existence of some additional displacements of the A and O′ sites in the bismuth pyrochlore structure [14].…”

Section: Resultsmentioning

confidence: 66%

Characterization and densification of defect pyrochlore oxide powders ABi2Ta5O16 (A=Na, Tl)

Ahmed

Bourja

Chagraoui

et al. 2019

Heliyon

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Defect pyrochlore oxide powders ABi 2 Ta 5 O 16 , in the pseudo-binary systems BiTaO 4 –ATa 3 O 8 (A = Na, Tl), were prepared by solid state method. The structural study showed that all oxides crystallize in a cubic system with the space group Fd 3 m , the lattice parameter “a” were determined using Rietveld refinement method. For systematic study on densification from powders, the samples were pressed with a uniaxial pressure into pellets; sintering temperature, holding time and heating rate were optimized. Techniques, including X-ray diffraction, IR-Raman, MEB, dilatometry, were employed to investigate the structure and the morphology of the synthesized powders and sintered materials. The dielectric characteristics, relative permittivity and dielectric losses (tgδ), determined at room temperature are comparable to those of other pyrochlores.

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“…Quan et al [54] explained that dielectric materials are in two main categories, namely capacitor and microwave. Dielectric materials with high dielectric coefficient are frequently utilised as capacitor dielectric materials in a ceramic field [62][63][64]; while dielectric materials having relatively low permittivity are utilised as microwave dielectric materials [65][66][67]. The continuous reduction of dielectric constant against the increase in frequency is relatively common for all-dielectric substances [55,[68][69][70].…”

Section: Gaseous Dielectricsmentioning

confidence: 99%

Application of nanoparticles and composite materials for energy generation and storage

Ibrahim

Jamiru

Sadiku

et al. 2019

IET Nanodielectrics

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Transition to renewable and sustainable energy from fossil fuels (natural gas, coal, and oil) has dominated the research cycle. The shift is as a result of increasing population growth, industrialisation, decreasing oil reserves and hazardous environmental impact of energy generation from fossil fuels. The new methods of energy generation demand functional materials that are smart and strong for generation and storage of energy. Polymeric composite materials have been widely used. With the recent material performance demand, there is a need to improve the properties of the composite. The improvement can be achieved by reinforcing with fibres and/or nanoparticles as the matrix alone does not possess the required properties. The influence of incorporating fibres and/or fillers into the polymeric matrix has been largely reported in many studies. Recent advancement in the development and use of polymeric composites and nanocomposites is discussed for energy applications. The discussion includes material property improvements, processing methods and improving interface adhesion that may arise when compounding the materials. Various areas, in the energy sector where these materials, can be used are equally highlighted.

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Dielectric properties and atomic-scale microstructural characterizations of cubic-pyrochlored ceramics in the system of Bi2O3-MgO-Nb2O5

Cited by 20 publications

References 27 publications

Investigation of structural and dielectric properties of subsolidus bismuth iron niobate pyrochlores

Investigation of structural and dielectric properties of subsolidus bismuth iron niobate pyrochlores

Characterization and densification of defect pyrochlore oxide powders ABi2Ta5O16 (A=Na, Tl)

Application of nanoparticles and composite materials for energy generation and storage

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