Papers by Author: Yi Chen

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Authors: Zhi Jin Fan, Jin Chuan Gu, Yi Chen, Yong Xin Jin, Min Yin, Wei Zhao
Abstract: Utilize cement specific surface area is larger and neutralizes the acidic aqueous ,which can adsorb heavy metal,properties and can precipitate heavy metal.Study on removal rate of Cu2+,Pb2 +, Zn2 +, Cd2 +. By study the properties of the cement and analyzing the experimental data on the cement dosage,the ion concentration,PH and the stirring time, the results show that cement has better adsorption and the effect of precipitation on the above four kinds of ion, removal rate increased with increasing PH,the mount of dosage and stirring time.
Authors: Qiang Chen, De Jun Lan, Yi Chen, Du Min Lin, Xi Yue, Ding Quan Xiao, Jian Guo Zhu
Abstract: Lead-free piezoelectric ceramics lithium sodium potassium niobate (LixNayK1-x-y)NbO3 (LNKN100x/100y) have been synthesized by a conventional solid state process. The effects of MnO2 addition on the properties of (LixNayK1-x-y)NbO3(x=0.06, y=0.5)(LNKN6/50) ceramics were investigated. It was found that a morphotropic phase boundary (MPB) between orthorhombic and tetragonal phases is in the composition range 0.05
Authors: Yi Chen, De Jun Lan, Qiang Chen, Ding Quan Xiao, Xi Yue, Jian Guo Zhu
Abstract: (1-x)BiScO3-xPbTiO3 (BSPT) based ferroelectric ceramics were prepared by conventional solid state process. X-ray diffraction analysis revealed that the morphotropic phase boundary (MPB) separating the rhombohedral and tetragonal phases for the BSPT system exited near x=0.62. It was found that the stability of perovskite structure of the BSPT system was improved with the increase of PbTiO3 content. For the 0.36BiScO3-0.64Pb1-ySryTiO3 (BSPST) system, because of higher amount of ionic bonding, the stability of perovskite structure for BSPT compounds containing strontium is larger than that of non-strontium compound.
Authors: De Jun Lan, Yi Chen, Qiang Chen, Yi Hang Jiang, Ding Quan Xiao, Jian Guo Zhu
Abstract: The (1-x)PST-xPZT(PSTZT) complex perovskite relaxor ferroelectric ceramics were prepared by wolframite precursor process(named two-step-sintering method, TSSM) and conventional oxides mixing method (named one-step-sintering method, OSSM), respectively. The experimental results demonstrated that pure perovskite PSTZT ceramics could be acquired by OSSM or TSSM. The temperature dependence of permittivity and dielectric loss of PSTZT ceramics indicated that PSTZT ceramics are relaxor ferroelectric ceramics with a complete diffusive phase transition. The pyroelectric properties of PSTZT ceramics prepared by OSSM and TSSM were also investigated via quiet-state method. It was found that the larger the x value of (1-x)PST-xPZT is, the lower the pyroelectric coefficient of PSTZT ceramics is. The pyroelectric coefficient of 0.9PST-0.1PZT ceramics is about (8~25) × 10-8C/cm2·K at room temperature. The pyroelectric figure of merit of PSTZT ceramics was also discussed.
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