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Wang L.,Nanjing University of Technology | Wang Z.,Nanjing University of Technology | Huang B.,Nanjing University of Technology | Zhang Q.,Nanjing University of Technology | Fu Z.,Guangdong Fenghua Advanced Technology Company Ltd
Journal of Materials Science: Materials in Electronics | Year: 2016

(Zr0.8Sn0.2)TiO4 (ZST) ceramics were prepared by conventional solid-state ceramic method and investigated by XRD, SEM and dielectric measurements. 1 wt% ZnO and different concentrations of Er2O3 ranging from 0.25 to 1 wt% were introduced to study their effect on the densification, microstructure and microwave dielectric properties of the ZST ceramics. It was found that the addition of ZnO and Er2O3 can significantly improved the density at lower temperature. Meanwhile, the microwave dielectric properties of ZST ceramics were also heavily influenced by the sintering aids. The maximum dielectric constant of 39.2 and Q × f value of 28,000 were found to be for the samples added with 0.25 wt% of Er2O3 sintered at 1240 °C for 4 h. © 2015, Springer Science+Business Media New York. Source


Wang L.,Nanjing University of Technology | Wang Z.,Nanjing University of Technology | Huang B.,Nanjing University of Technology | Zhang Q.,Nanjing University of Technology | Fu Z.,Guangdong Fenghua Advanced Technology Company Ltd
Journal of Materials Science: Materials in Electronics | Year: 2015

(Zr0.8Sn0.2)TiO4 (ZST) ceramics were prepared by conventional solid-state ceramic method. The effects of ZnO + CeO2 on the phase composition, microstructure, sintering characteristics and microwave dielectric properties of ZST ceramics were investigated. Only a single phase (Zr0.8Sn0.2)TiO4 was identified for XRD patterns. The sintering temperature decreased from 1550 to 1220 °C owning to the composite addition of ZnO and CeO2. The excellent microwave dielectric properties have been obtained in the samples of ZnO (1 wt%) + CeO2 (0.5 wt%) doped ZST ceramics sintered at 1220 °C for 4 h: εr = 37, Q × f = 33,000 GHz, τf = −0.76 ppm/°C. © 2015 Springer Science+Business Media New York Source


Wang Z.,Nanjing University of Technology | Huang B.,Nanjing University of Technology | Wang L.,Nanjing University of Technology | Fu Z.,Guangdong Fenghua Advanced Technology Company Ltd | Zhang Q.,Nanjing University of Technology
Journal of Materials Science: Materials in Electronics | Year: 2014

Microwave dielectric ceramics with the composition of Ba(Co1/3Nb2/3)O3–MnO2 (BCN–MnO2) were prepared by the solid-state reaction method. The effects of MnO2 on phase composition, microstructure, sintering characteristics and microwave dielectric properties of BCN ceramics were investigated. The additive MnO2 slightly decreased the sintering temperature and improved the densification of BCN as sintering aids. The multivalent Mn was beneficial for maintaining the compositional stability of BCN, which broadened the region of the sintering temperature. The Q × f value and temperature coefficient of resonant frequency (τf) were improved by 0.3 wt% MnO2. BCN–0.3 wt% MnO2 ceramic sintered at 1,340 °C for 12 h in air exhibited good microwave dielectric properties with εr = 32.9, Q × f = 90,431 GHz, τf = −12 ppm/°C. © 2014, Springer Science+Business Media New York. Source


Wang Z.,Nanjing University of Technology | Wu J.,Nanjing Branch of Sinoma Technology & Equipment Group Co. | Wang L.,Nanjing University of Technology | Fu Z.,Guangdong Fenghua Advanced Technology Company Ltd | Zhang Q.,Nanjing University of Technology
Electronic Materials Letters | Year: 2014

Ba(Co1/3Nb2/3)O3 (BCN) ceramics were prepared using a conventional solid-state route. Effects of sintering on microstructure and microwave dielectric properties of Ba(Co1/3Nb2/3)O3 ceramics were systematically investigated. Appropriate sintering temperature could restrain the evaporation of CoO and the formation of Nb-rich phase. The dielectric constants and temperature coefficients of resonant frequency changed slightly with the variation in sintering temperatures. The high Q × f value with prolonged sintering time was related to the improvement of 1: 2 ordered arrangement in the B site, rather than the compactness of ceramics. Excellent microwave dielectric properties (εr=32.6, Q × f =86857 GHz, τf=−14 ppm/°C) were obtained in the Ba(Co1/3Nb2/3)O3 ceramics sintered at 1380°C for 12 h. © 2014, The Korean Institute of Metals and Materials and Springer Science+Business Media Dordrecht. Source


Wang Z.F.,Nanjing University of Technology | Huang B.Y.,Nanjing University of Technology | Wang L.X.,Nanjing University of Technology | Fu Z.X.,Guangdong Fenghua Advanced Technology Company Ltd | Zhang Q.T.,Nanjing University of Technology
Materials Letters | Year: 2015

Microwave dielectric ceramics of Ba(Co0.7Zn0.3)1/3Nb2/3O3 (BCZN) with MnO2 addition have been prepared by the solid-state reaction method. The low-temperature annealed samples were added to make comparison. The results revealed that the improvement of Q x f value was attributed to 1 mol% MnO2 addition in the unannealed BCZN, but the annealed BCZN had a sharp decrease on Q x f value. The microstructures and crystal structures were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD) analysis and electrical conductivity results to reveal the mechanisms. © 2014 Elsevier B.V. All rights reserved. Source

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