Microwave sintering of nanopowder ZnNb2O6: Densification, microstructure and microwave dielectric properties

Bafrooei, Hadi Barzegar; Nassaj, E. Taheri; Hu, C. F.; Huang, Qing; Ebadzadeh, Touradj

doi:10.1016/j.physb.2014.07.024

Cited by 14 publications

(8 citation statements)

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“…The microwave dielectric properties ( Q × f value versus τ f ) of the reported ZnNb 2 O 6 ‐based MWDCs are summarized in Figure , and some typical systems are listed in Table . It is obvious that the current trilayered ZNO/TO/ZNO ceramics exhibit superior microwave dielectric properties than the available ZnNb 2 O 6 ‐based MWDCs.…”

Section: Resultsmentioning

confidence: 99%

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High‐Q and temperature‐stable microwave dielectrics in layer cofired Zn_1.01Nb₂O₆/TiO₂/Zn_1.01Nb₂O₆ ceramic architectures

et al. 2018

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A multilayer cofired architecture was proposed and demonstrated to achieve high-Q and temperature-stable microwave dielectrics in a derived system, Zn 1.01 Nb 2 O 6 -TiO 2 . This approach could effectively allow the chemical reactions between Zn 1.01 Nb 2 O 6 and TiO 2 occur at a rather narrow area (~12 μm), the interfaces of heterogeneous layers, where the diffusion of Zn, Nb, and Ti could be observed. Such interfaces could act as the in situ "glues" to connect each layer well. The effects of stacking scheme and TiO 2 content on the microwave dielectric properties of layered architectures were investigated systematically. The resonant frequency, Q-factor, and electric field distribution were reported using the eigenmode solver of high-frequency structure simulator. Among the available layer architectures, the optimized microwave dielectric characteristic was observed in Zn 1.01 Nb 2 O 6 /TiO 2 /Zn 1.01 Nb 2 O 6 stacked with 0.058 mol TiO 2 (~1.84 vol%).The τ f can be effectively tuned to approximately +0.53 ppm/°C, and importantly, a high Q × f value~99 500 GHz together with ε r~2 6.8 was achieved. This design could be beneficial for opening up new ways to develop high-performance microwave dielectrics based on current material systems and therefore to meet with the high requirements for 5G wireless communication components and multilayer packing technology. K E Y W O R D Sdielectric materials/

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Section: Resultsmentioning

confidence: 99%

“…Summary of Q × f value versus τ f plot for ZnNb 2 O 6 ‐based system microwave dielectric ceramics. The data are collected from literatures [Color figure can be viewed at wileyonlinelibrary.com]…”

Section: Resultsmentioning

confidence: 99%

High‐Q and temperature‐stable microwave dielectrics in layer cofired Zn_1.01Nb₂O₆/TiO₂/Zn_1.01Nb₂O₆ ceramic architectures

et al. 2018

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“…According to the characteristics of microwave dielectric properties, microwave dielectric ceramics can be divided into low ε r ( ε r < 15) and high Qf ceramics: Al 2 O 3 [ 1 ], MgAl 2 O 4 [ 2 ], etc. ; medium ε r ( ε r ~30) and Qf value ceramics: BaTi 4 O 9 [ 3 ], ZnNb 2 O 6 [ 4 ], etc. ; high ε r ( ε r > 60) and low Qf materials: CaCu 3 Ti 4 O 12 [ 5 ], Li 2 O-Nb 2 O 5 -TiO 2 [ 6 ], etc.…”

Section: Introductionmentioning

confidence: 99%

Grain Growth Kinetics of 0.65Ca0.61La0.26TiO3-0.35Sm(Mg0.5Ti0.5)O3 Dielectric Ceramic

et al. 2020

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The 0.65Ca0.61La0.26TiO3-0.35Sm(Mg0.5Ti0.5)O3[0.65CLT-0.35SMT] ceramic was prepared by the solid-state reaction method. The effects of sintering process on its microstructure and grain growth behavior were investigated. The Hillert model and a simplified Sellars model were established by linear regression, and the Sellars-Anelli model with a time index was established by using a nonlinear regression method. The results show that the grain size gradually increases with the increase of sintering temperature and holding time. Meanwhile, the sintering temperature has a more significant effect on the grain growth. The grain sizes of 0.65CLT-0.35SMT ceramic were predicted by the three models and compared with the experimentally measured grain size. The results indicate that for the 0.65CLT-0.35SMT ceramic, the Hillert model has the lowest prediction accuracy and the Sellars-Anelli model, the highest prediction accuracy. In this work, the Sellars-Anelli model can effectively predict the grain growth process of 0.65CLT-0.35SMT ceramic.

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“…In recent years, Bafrooei and his co-workers [14] investigated the microwave sintering effect on densification, microstructure and microwave dielectric properties of ZnNb 2 O 6 nanopowders. Jeong and his co-workers [15] studied the fabrication of super hydrophobic niobium pentoxide thin films employing anodization.…”

Section: Introductionmentioning

confidence: 99%

Structural phase transitions in niobium oxide nanocrystals

Yuvakkumar

Hong

2015

Phase Transitions

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Niobium oxide nanocrystals were successfully synthesized employing the green synthesis method. Phase formation, microstructure and compositional properties of 1, 4 and 7 days incubation treated samples after calcinations at 450 C were examined using X-ray diffraction, Raman, photoluminescence (PL), infrared, X-ray photoelectron spectra and transmission electron microscopic characterizations. It was observed that phase formation of Nb 2 O 5 nanocrystals was dependent upon the incubation period required to form stable metal oxides. The characteristic results clearly revealed that with increasing incubation and aging, the transformation of cubic, orthorhombic and monoclinic phases were observed. The uniform heating at room temperature (32 C) and the ligation of niobium atoms due to higher phenolic constituents of utilized rambutan during aging processing plays a vital role in structural phase transitions in niobium oxide nanocrystals. The defects over a period of incubation and the intensities of the PL spectra changing over a period of aging were related to the amount of the defects induced by the phase transition. IntroductionNiobium oxide (Nb 2 O 5 ) has been used to develop electrical,[1,2] superconducting,[3] relaxor,[4À6] optical, thermal and structural,[7À10] resistance switching,[11] dielectric and pyroelectric,[12] and phase transition [13] properties. In recent years, Bafrooei and his co-workers [14] investigated the microwave sintering effect on densification, microstructure and microwave dielectric properties of ZnNb 2 O 6 nanopowders. Jeong and his co-workers [15] studied the fabrication of super hydrophobic niobium pentoxide thin films employing anodization. Yang and his co-workers [16] explored the sensing and pH imaging properties of niobium oxide prepared employing rapid thermal annealing for electrolyte insulator semiconductor structure and light-addressable potentiometric sensor applications. Kadir and his co-workers [17] studied Nb 2 O 5 Schottky-based ethanol vapour sensors effect of metallic catalysts. Kong and his co-workers [18] revealed ultra high intercalation pseudocapacitance of mesoporous orthorhombic niobium pentoxide from a novel cellulose nanocrystal template. Wang and his co-workers [19] investigated orthorhombic niobium oxide nanowires for next generation hybrid supercapacitor device. Zhou and his co-workers [20] studied photoluminescence (PL) of amorphous niobium oxide films synthesized by solid state reaction. In a separate study, Karlinsey [21] investigated the preparation of self-organized niobium oxide microstructures via potentiostatic anodization.However, the above preparation methods involve either two chemical precursors or high temperature, solvents, reductants and stabilizing agents as well as high costs for the

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Microwave sintering of nanopowder ZnNb2O6: Densification, microstructure and microwave dielectric properties

Cited by 14 publications

References 37 publications

High‐Q and temperature‐stable microwave dielectrics in layer cofired Zn_1.01Nb₂O₆/TiO₂/Zn_1.01Nb₂O₆ ceramic architectures

High‐Q and temperature‐stable microwave dielectrics in layer cofired Zn_1.01Nb₂O₆/TiO₂/Zn_1.01Nb₂O₆ ceramic architectures

Grain Growth Kinetics of 0.65Ca0.61La0.26TiO3-0.35Sm(Mg0.5Ti0.5)O3 Dielectric Ceramic

Structural phase transitions in niobium oxide nanocrystals

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Microwave sintering of nanopowder ZnNb2O6: Densification, microstructure and microwave dielectric properties

Cited by 14 publications

References 37 publications

High‐Q and temperature‐stable microwave dielectrics in layer cofired Zn1.01Nb2O6/TiO2/Zn1.01Nb2O6 ceramic architectures

High‐Q and temperature‐stable microwave dielectrics in layer cofired Zn1.01Nb2O6/TiO2/Zn1.01Nb2O6 ceramic architectures

Grain Growth Kinetics of 0.65Ca0.61La0.26TiO3-0.35Sm(Mg0.5Ti0.5)O3 Dielectric Ceramic

Structural phase transitions in niobium oxide nanocrystals

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Product

Resources

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High‐Q and temperature‐stable microwave dielectrics in layer cofired Zn_1.01Nb₂O₆/TiO₂/Zn_1.01Nb₂O₆ ceramic architectures

High‐Q and temperature‐stable microwave dielectrics in layer cofired Zn_1.01Nb₂O₆/TiO₂/Zn_1.01Nb₂O₆ ceramic architectures