The synthesis process for La 1- x Sr x Mn 1- y Co y O 3- δ ( x = 0.2, 0.3; y = 0.2, 0.8, designated as LSMC below) perovskite oxides prepared by solid state reaction was investigated using DSC/TG, XRD, EPMA and parti...The synthesis process for La 1- x Sr x Mn 1- y Co y O 3- δ ( x = 0.2, 0.3; y = 0.2, 0.8, designated as LSMC below) perovskite oxides prepared by solid state reaction was investigated using DSC/TG, XRD, EPMA and particle size analysis methods. It was found that LSMCs were all of single phase and the synthesis process might be divided into three stages: the decomposition of reactants, the formation of LaMn(Co)O 3 based oxides, and the formation of LSMC solid solution. Typical average and the peak value of particle size, and the specific surface area are 14.65?μm, 16.4?μm and 1.38?m 2/mL, respectively, for mixed reactants and are 23.81?μm, 32.11?μm and 0.5?m 2/mL, respectively, for powder synthesized at 1?200?℃ for 8?h in air.展开更多
A novel and simple one-step, solid state reaction of multicomponent systems has been developed to synthesize cyclopentadienyl-containing organolanthanide complexes, in which the effects of the coordinated solvent mole...A novel and simple one-step, solid state reaction of multicomponent systems has been developed to synthesize cyclopentadienyl-containing organolanthanide complexes, in which the effects of the coordinated solvent molecules and the nature of the reactants were also studied. We also studied the solid state decomposition reaction of Cp2YbPz(HPz), and the formation of [CpYb(Pz)2]2 may indicate that the constrained environment in solid state can lead to a novel chemical transformation, with product selectivity possibly different from that in the liquid phase.展开更多
Nanophase LiCoO 2 was synthesized by solid state reaction with low heating temperature, i.e. the reactants Co(Ac) 2·4H 2O and LiOH·H 2O in the appropriate molar ratio(1∶1) were mixed and ground in agate mor...Nanophase LiCoO 2 was synthesized by solid state reaction with low heating temperature, i.e. the reactants Co(Ac) 2·4H 2O and LiOH·H 2O in the appropriate molar ratio(1∶1) were mixed and ground in agate mortar, then calcined. The samples obtained were characterized by XRD and IR methods. The phenomena during synthesizing are discussed by TG/TDA analysis, and the optimum temperature of heating was chosen. The BET and ICP results suggest that the sample has a large specific surface(54.29 m 2/g), a low quantity of impurity, thus it may be a good battery material. The nanophase LiCoO 2 samples produced have good cyclic performance and a higher working voltage plateau(3.9 V).展开更多
文摘The synthesis process for La 1- x Sr x Mn 1- y Co y O 3- δ ( x = 0.2, 0.3; y = 0.2, 0.8, designated as LSMC below) perovskite oxides prepared by solid state reaction was investigated using DSC/TG, XRD, EPMA and particle size analysis methods. It was found that LSMCs were all of single phase and the synthesis process might be divided into three stages: the decomposition of reactants, the formation of LaMn(Co)O 3 based oxides, and the formation of LSMC solid solution. Typical average and the peak value of particle size, and the specific surface area are 14.65?μm, 16.4?μm and 1.38?m 2/mL, respectively, for mixed reactants and are 23.81?μm, 32.11?μm and 0.5?m 2/mL, respectively, for powder synthesized at 1?200?℃ for 8?h in air.
基金This work was supported by the National Natural Science Foundation of China(Grunt No.20172013)the Rescarch Funds of Excellent Young Teacher and the New Century Distinguished Scientist of the Ministry of Education of China.
文摘A novel and simple one-step, solid state reaction of multicomponent systems has been developed to synthesize cyclopentadienyl-containing organolanthanide complexes, in which the effects of the coordinated solvent molecules and the nature of the reactants were also studied. We also studied the solid state decomposition reaction of Cp2YbPz(HPz), and the formation of [CpYb(Pz)2]2 may indicate that the constrained environment in solid state can lead to a novel chemical transformation, with product selectivity possibly different from that in the liquid phase.
文摘Nanophase LiCoO 2 was synthesized by solid state reaction with low heating temperature, i.e. the reactants Co(Ac) 2·4H 2O and LiOH·H 2O in the appropriate molar ratio(1∶1) were mixed and ground in agate mortar, then calcined. The samples obtained were characterized by XRD and IR methods. The phenomena during synthesizing are discussed by TG/TDA analysis, and the optimum temperature of heating was chosen. The BET and ICP results suggest that the sample has a large specific surface(54.29 m 2/g), a low quantity of impurity, thus it may be a good battery material. The nanophase LiCoO 2 samples produced have good cyclic performance and a higher working voltage plateau(3.9 V).
