Guangdong Fenghua Advanced Technology Company Ltd

Zhaoqing, China

Guangdong Fenghua Advanced Technology Company Ltd

Zhaoqing, China

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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.


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.


Pi X.-X.,Nanjing University of Technology | Chen J.-S.,Guangdong Fenghua Advanced Technology Company Ltd | Cao X.-H.,Guangdong Fenghua Advanced Technology Company Ltd | Fu Z.-X.,Guangdong Fenghua Advanced Technology Company Ltd | And 2 more authors.
Rengong Jingti Xuebao/Journal of Synthetic Crystals | Year: 2013

Glass samples of xTeO2-(98-x)PbO-2Bi2O3 (x=40mol%, 45mol%, 50mol%, 55mol%, 60mol%)were prepared by a melt quenching method. The structural changes of glasses were analyzed using Infrared and Raman Spectra. The effects of TeO2 content on the softening temperature, thermal expansion coefficient and chemical durability of the samples were investigated. The silver paste was fabricated by uniformly mixing with silver power, glass frit and organic carrier at a certain ratio. Then the front contact silver electrodes of solar cells were made through silk-screen printing and rapid sintering by silver paste. The effects of glass frit on the corrosion of antireflection coating, silver film adhesion force and resistivity were analyzed. The results indicate that the basic structural units change from TeO3 trigonal pyramid and PbO4 square pyramid to TeO4 trigonal bypyramid with increasing content of TeO2. When the TeO2 content is 55mol%, the dominating structural unit is TeO3 trigonal pyramid and TeO4 trigonal bypyramid, and the tellurite glass has excellent performance (Tf=540°C, α=16×10-6/°C, DR=6.5605×10-8 g·cm-2·min-1). What's more, the corrosion effect of glass frit on antireflection coating is obvious, the silver film adhesion force is big and the resistivity is low (T=4.4 N, ρ=2.617 μΩ·cm).


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


Gong Z.,Nanjing University of Technology | Wang Z.,Nanjing University of Technology | Wang L.,Nanjing University of Technology | Han W.,Guangdong Fenghua Advanced Technology Company Ltd | And 2 more authors.
Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society | Year: 2013

The microwave dielectric multiphase ceramics of (1-x)MgSn0.05 Ti0.95O3-xSrTiO3 were prepared by a conventional solid-state route. The sinterability, microstructure and microwave dielectric properties of the multiphase ceramics were investigated. The results show that MgSn0.05 Ti0.95O3 and SrTiO3 can co-exist as two phases without any solid solution. The relative dielectric constant (εr) linearly increased, the quality factor (Q × f) decreased and the value of the temperature coefficient of resonance frequency (τf) varied from negative to positive with the increase of SrTiO3 content. In addition, a near-zero τf value was obtained by the adjustment of the value of x. The variation in the the value of τf of (1-x)MgSn0.05 Ti0.95 O3-xSrTiO3multiphase ceramics followed the Lichtenecker mixture rules. The multiphase ceramic 0.98MgSn0.05 Ti0.95O3-0.02SrTiO3sintered at 1330°C for 4 h had excellent microwave dielectric properties (i.e., εr=19.32, Q ×f=193.527 THz, τf=-2 ×10-6/°C).


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.


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.


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: 2015

(Ba1−xSrx)(Co1/3Nb2/3)O3 (0 ≤ x ≤ 0.5) microwave dielectric ceramics had been prepared using the solid-state reaction method. The dense microstructures with small grains were obtained. All Sr2+ substituted samples exhibited the perovskite phase. The structure transition from cubic to hexagonal occurred with the increase of x, which led to higher degree of 1:2 ordered structure in the B site. The improved Q × f value was correlated monotonously with the ordering parameters S. The dielectric constant (εr) and the temperature coefficient of resonant frequency (τf) could be effectively tuned by tailoring x. A good combination of microwave dielectric properties was obtained for (Ba0.95Sr0.05)(Co1/3Nb2/3)O3 sintered at 1380 °C: εr = 33.3, Q × f = 87,120 GHz, τf = 4 ppm/°C. © 2015, Springer Science+Business Media New York.


Gong Z.,Nanjing University of Technology | Wang Z.,Nanjing University of Technology | Wang L.,Nanjing University of Technology | Fu Z.,Guangdong Fenghua Advanced Technology Company Ltd | And 2 more authors.
Electronic Materials Letters | Year: 2013

A series of Sn-doped Mg(SnxTi1-x)O3 ceramics were prepared using the conventional solid-state route. The influence of Sn4+ substitution for Ti4+ on the microstructure and microwave dielectric properties of Mg(SnxTi1-x)O3 ceramics was systematically investigated. Substitution with a suitable amount of Sn can eliminate the MgTi2O5 phase. The dielectric constants and temperature coefficients of resonant frequency changed slightly with the variation in Sn content in the specimens. However, the quality factors (Q) dramatically improved and were sensitive to the concentration of Sn4+. The high Q value was attributed to the uniform grain, clean and narrow grain boundary, and elimination of the MgTi2O5 phase. Moreover, the composition-optimized Mg(Sn0.05Ti0.95)O3 ceramics sintered at 1390°C exhibited excellent microwave dielectric properties of e{open} r = 17.61, Q×f = 328,543 GHz, and τ f = -42 ppm/°C. © 2013 The Korean Institute of Metals and Materials and Springer Science+Business Media Dordrecht.


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.

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