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Shaoying Zheng,Longlong Fan,Erika Odendo,Laijun Liu,Danping Shi,Guizhong Li,Jun Chen,Liang Fang,Brahim Elouadi 한국물리학회 2014 Current Applied Physics Vol.14 No.1
Perovskite structure (1 x)BaTiO3exBiAlO3 (BTexBA, x ¼ 0.05, 0.08 and 0.1, corresponding to BTe5BA, BTe8BA and BTe10BA, respectively) ceramics were prepared by a solid state reaction route. Crystal structure of BTexBA ceramics was determined by using XRD. Dielectric properties were studied as a function of temperature at different frequencies, which indicated that the phase transition temperature (Tm) decreased with increasing x. With increasing temperature, thermal expansion dl/l increased while thermal expansion coefficient a had weak concentration dependence. The Burns temperature was much higher than the transition temperature Tm for the BTe5BA and BTe10BA ceramics. Polarization hysteresis loops (PeE), electrostrictive (SeE) and S versus P2 (SeP2) at different temperatures were displayed. Pmax slightly decreased due to thermally activated leakage current, meanwhile, Smax decreased at above Tm with the contribution of ferroelectric domain reorientation decreased. The electrostrictive coefficient Q value was clearly larger than that of lead-based electrostrictors at room temperature. Furthermore, it exhibited a slim loop with negligible hysteresis and a subtle linear feature at higher temperature.
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Gong-Ying Wang,Zhiyong Deng,Ning Jiang,Shaoying Liu,Cong-Ming Tang 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.9
Water plays a crucial role in the synthesis mechanism of metal organic framework-5 (MOF-5). Synthesized MOF-5 with good phase structure and large specific surface area is largely determined by an important synthesis factor: the total water concentration of the initial synthesis solution (Ctw). An understanding of the effects of different and high Ctw on the synthesis of MOF-5 and the investigation of the maximum Ctw suitable for the synthesis of MOF-5 are important to guide the synthesis of MOF-5. Through the research of the maximum Ctw, a favorable synthetic approach was established which could realize the synthesis of MOF-5 with fine performance on CO2 adsorption and separation. The research results show that the maximum Ctw could be as high as 1,440mmol/L, and synthesized MOF- 5 still has a good phase structure and a large specific surface area of 2,136m2/g (BET). Synthesized MOF-5 by the maximum Ctw exhibits a high CO2 adsorption capacity of 2.5mmol/g and a low N2 adsorption capacity of 0.2mmol/g at 298 K and 100 kPa. More importantly, synthesized MOF-5 by the maximum Ctw exhibits a high selectivity for CO2/N2 of 18-22 at 298 K and 20-130 kPa in simulated flue gas.
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