Influence of Li2WO4 aid and sintering temperature on microstructures and microwave dielectric properties of Zn2SnO4 ceramics

Chen, Yih-Chien; You, Hong-Mine; Chang, Kai‐Chih

doi:10.1016/j.ceramint.2014.11.047

Cited by 18 publications

(9 citation statements)

References 14 publications

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“…Vlazan et al (2015) also obtained a TiO 2 -ZnO oxide system via a hydrothermal method; the TEM images of the obtained powders showed individual particles of nanometric size (> 50 nm). The observed sintering effect produced by the calcination process is well described in the literature (Chen et al 2015;Konyar et al 2012;Luo and Zhang (2015); Nie et al 2015). In the cited studies it was shown that the calcination process causes the disappearance of individual particles, and closure of the porous structure is observed.…”

Section: Characteristics Of the Synthesized Photocatalystssupporting

confidence: 62%

Synthesis of highly crystalline photocatalysts based on TiO2 and ZnO for the degradation of organic impurities under visible-light irradiation

et al. 2019

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A TiO 2 -ZnO binary oxide system (with molar ratio TiO 2 :ZnO = 8:2) was synthesized by a hydrothermal method, assisted by calcination at temperatures of 500, 600 and 700 °C, using zinc citrate as the precursor of ZnO. The morphology (SEM, TEM), crystalline structure (XRD, Raman spectroscopy), diffuse reflectance spectra (DRS), chemical surface composition (EDXRF), porous structure parameters (low-temperature N 2 sorption) and characteristic functional groups (FT-IR) of the TiO 2 -ZnO oxide materials were comprehensively analyzed. The novelty of this work is the observation of the coexistence of the crystalline structures of anatase and ZnTiO 3 in TiO 2 -ZnO oxide materials. Moreover, it is shown that the obtained materials absorb visible radiation. The key stage of the study was the evaluation of the photocatalytic activity of the TiO 2 -ZnO binary oxide systems in the degradation of model organic pollutants: C.I. Basic Red 1, C.I. Basic Violet 10, C.I. Basic Blue 3 and 4-nitrophenol. For all synthesized materials, a high efficiency of degradation of the model organic impurities was demonstrated. The results show that the synthesized products may be materials of interest for use in the degradation of organic pollutants. Moreover, the kinetics of the photocatalytic degradation of selected organic compounds were determined based on the Langmuir-Hinshelwood equation, assuming a pseudo-first-order (PFO) reaction.

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Section: Characteristics Of the Synthesized Photocatalystssupporting

confidence: 62%

Synthesis of highly crystalline photocatalysts based on TiO2 and ZnO for the degradation of organic impurities under visible-light irradiation

et al. 2019

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“…This type of crystal structure has a great variability because of variety cation selections, and possibilities in cation ordering such as common spinel (AB2O4), inverse spinel (B(AB)O4) and mixed-type spinel. So far, spinel structured ceramics for high frequency application include M2SnO4 [13][14], M2SiO4 [15][16], MAl2O4 (M=Zn, Mg) [17][18] and MGa2O4 (M = Zn, Mg) [19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Sc Modification Induced Short-range Ordering in ZnGa2O4 Spinel Leading to High Microwave Dielectric Performance

Quan

Zheng

et al. 2020

Preprint

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Sc3+ (0,0.1,0.3,0.5,0.7mol%) modified ZnGa2O4 (abbreviated Sc-ZGO) ceramics were synthesized by solid-state method. The relationship between microwave dielectric performance and bonds vibration of Sc-ZGO as a function of Sc3+ modification has been systematically investigated. With Sc3+ modification, the εr of Sc-ZGO ceramics keeps steady (~10). While the τf of Sc-ZGO shows linear correlation with Sc3+ concentration increasing from -71ppm/℃ to -39ppm/℃, and the Q×f value climbs up to a maximum value (5Sc-ZGO) and then ramp down. 5Sc-ZGO sintered at 1350oC for 2 h exhibits the best microwave dielectric properties with εr = 9.9, Q×f = 124,147 GHz, tanδ = 7.98×10-5, and τf = -56 ppm/°C (@9.9 GHz). Q×f value of Sc modified ZGO increased by almost 45% compared with normal spinel ZnGa2O4 ceramics. The enhancement of τf and Q×f on Sc modified ZnGa2O4 can be attributed to higher densification, however, further Raman and FT-IR analysis elucidated that short-range cation ordering degree is another governing factor. The influence of Sc3+ modification on ZnGa2O4 bonds vibration has been discussed in detail.

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“…Common spinel ceramics for millimeter region application include M 2 SnO 4 , M 2 SiO 4 and MAl 2 O 4 (M = Zn, Mg). Low quality factor and the considerable negative temperature coefficient of resonant frequency have limited the application of M 2 SnO 4 (M = Zn, Mg) materials.…”

Section: Introductionmentioning

confidence: 99%

Influence of inverse spinel structured CuGa₂O₄ on microwave dielectric properties of normal spinel ZnGa₂O₄ ceramics

Bian

et al. 2017

J Am Ceram Soc

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Spinel Zn 1-x Cu x Ga 2 O 4 (x = 0-0.15) ceramics were prepared by the conventional solid-state method. Only a single phase was indexed in all samples. The continuous lattice contraction of ZnGa 2 O 4 unit cell was caused by Cu 2+ substitution, and the lattice parameter shows a linear correlation with the content of Cu. The refined crystal structure parameters suggest that Cu 2+ preferentially occupies the octahedron site, and the degree of inversion of Zn 1-x Cu x Ga 2 O 4 (x = 0-0.15) ceramics almost equals to the content of Cu 2+ . The relative intensity of A* 1g mode in Raman spectra confirm that the degree of inversion climbed with the growing content of Cu 2+ . The experimental and theoretical dielectric constant of Zn 1-x Cu x Ga 2 O 4 ceramics fit well. Zn 1-x Cu x Ga 2 O 4 (x = 0.01) ceramics sintered at 1400°C for 2 h exhibited good microwave dielectric properties, with e r = 9.88, Q 9 f = 131,445 GHz, tand = 6.85 9 10 À5 , and s f = À60 ppm/°C. K E Y W O R D S dielectric materials/properties, gallium/gallium compounds, spinels Grant

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Influence of Li2WO4 aid and sintering temperature on microstructures and microwave dielectric properties of Zn2SnO4 ceramics

Cited by 18 publications

References 14 publications

Synthesis of highly crystalline photocatalysts based on TiO2 and ZnO for the degradation of organic impurities under visible-light irradiation

Synthesis of highly crystalline photocatalysts based on TiO2 and ZnO for the degradation of organic impurities under visible-light irradiation

Sc Modification Induced Short-range Ordering in ZnGa2O4 Spinel Leading to High Microwave Dielectric Performance

Influence of inverse spinel structured CuGa₂O₄ on microwave dielectric properties of normal spinel ZnGa₂O₄ ceramics

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Influence of Li2WO4 aid and sintering temperature on microstructures and microwave dielectric properties of Zn2SnO4 ceramics

Cited by 18 publications

References 14 publications

Synthesis of highly crystalline photocatalysts based on TiO2 and ZnO for the degradation of organic impurities under visible-light irradiation

Synthesis of highly crystalline photocatalysts based on TiO2 and ZnO for the degradation of organic impurities under visible-light irradiation

Sc Modification Induced Short-range Ordering in ZnGa2O4&nbsp;Spinel Leading to High Microwave Dielectric Performance

Influence of inverse spinel structured CuGa2O4 on microwave dielectric properties of normal spinel ZnGa2O4 ceramics

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Sc Modification Induced Short-range Ordering in ZnGa2O4 Spinel Leading to High Microwave Dielectric Performance

Influence of inverse spinel structured CuGa₂O₄ on microwave dielectric properties of normal spinel ZnGa₂O₄ ceramics