Bismuth zinc titanate dopied lead magnesium niobate-lead titanate[Bi(Zn_(1/2)Ti_(1/2))O_(3)−Pb(Mg_(1/3)Nb_(2/3))O_(3)−PbTiO_(3)(BZT-PMN-PT)]piezoelectric ceramics are synthesized by the conventional solid state reacti...Bismuth zinc titanate dopied lead magnesium niobate-lead titanate[Bi(Zn_(1/2)Ti_(1/2))O_(3)−Pb(Mg_(1/3)Nb_(2/3))O_(3)−PbTiO_(3)(BZT-PMN-PT)]piezoelectric ceramics are synthesized by the conventional solid state reaction method.Ferroelectric domain structures and the evolutionary behavior of BZT-PMN-PT ceramics under an external in-plane electric field are investigated by piezoresponse force microscopy(PFM).It is found that the BZT doping has a significant effect on the domain configurations and the domain kinetic behavior of the piezoelectric BZT-PMN-PT solid solution ceramics.Microdomains embedded in the macrodomains,induced by the BZT dopant in the solid solution ceramics,are clearly observed by PFM and their volume increases with increasing amounts of BZT doping.The microdomains of BZT-PMN-PT piezoelectric ceramics exhibit better domain dynamic behavior stability than macrodomains under an external in-plane electric field.展开更多
Structural growth mechanism,energetics,and electronic properties of cationic,neutral,and anionic lutetium doped germanium cluster LuGen^((+/0/-))(n=6~19)were comprehensively studied by the ABCluster unbiased global se...Structural growth mechanism,energetics,and electronic properties of cationic,neutral,and anionic lutetium doped germanium cluster LuGen^((+/0/-))(n=6~19)were comprehensively studied by the ABCluster unbiased global search technique with a hybrid density functional theory approach.Compared to the experimental PES,the anion evolution of structure can be clearly defined as four-phase:from the adsorbed to the link structure,then to the half cage motif,and finally to the endohedral structure.The results revealed that the LuGe16-as Frank-Kasper structure with high symmetry of Td can greatly enhance the stabilities.Doped structures have shown thermodynamic stability and appropriate energy gap.These materials are suitable semiconductors.Various approaches,including quasi-spherical geometry with closed-shell model,aromaticity,UV-Vis spectra,density of states(DOS)and partial density of states(PDOS)were applied to further support the results.展开更多
基金by the Foundation for Innovative Research Groups of the National Natural Science Foundation of China under Grant No 50821004the National Basic Research Program of China under Grant No 2009CB623305the Project-Sponsored by SRF for ROCS,SEM,China.
文摘Bismuth zinc titanate dopied lead magnesium niobate-lead titanate[Bi(Zn_(1/2)Ti_(1/2))O_(3)−Pb(Mg_(1/3)Nb_(2/3))O_(3)−PbTiO_(3)(BZT-PMN-PT)]piezoelectric ceramics are synthesized by the conventional solid state reaction method.Ferroelectric domain structures and the evolutionary behavior of BZT-PMN-PT ceramics under an external in-plane electric field are investigated by piezoresponse force microscopy(PFM).It is found that the BZT doping has a significant effect on the domain configurations and the domain kinetic behavior of the piezoelectric BZT-PMN-PT solid solution ceramics.Microdomains embedded in the macrodomains,induced by the BZT dopant in the solid solution ceramics,are clearly observed by PFM and their volume increases with increasing amounts of BZT doping.The microdomains of BZT-PMN-PT piezoelectric ceramics exhibit better domain dynamic behavior stability than macrodomains under an external in-plane electric field.
基金supported by the National Natural Science Foundation of China (No. 21863007)
文摘Structural growth mechanism,energetics,and electronic properties of cationic,neutral,and anionic lutetium doped germanium cluster LuGen^((+/0/-))(n=6~19)were comprehensively studied by the ABCluster unbiased global search technique with a hybrid density functional theory approach.Compared to the experimental PES,the anion evolution of structure can be clearly defined as four-phase:from the adsorbed to the link structure,then to the half cage motif,and finally to the endohedral structure.The results revealed that the LuGe16-as Frank-Kasper structure with high symmetry of Td can greatly enhance the stabilities.Doped structures have shown thermodynamic stability and appropriate energy gap.These materials are suitable semiconductors.Various approaches,including quasi-spherical geometry with closed-shell model,aromaticity,UV-Vis spectra,density of states(DOS)and partial density of states(PDOS)were applied to further support the results.
