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SPONTANEOUS POLARIZATION IN UNCONVENTIONAL Ta_(2)O_(5)dielectric ceramicS BY LASER SINTERING

Journal of Advanced dielectrics 2011年第2期1卷 197-201页

作者： LINGFEI JI YIJIAN JIANG Institute of Laser Engineering Beijing University of Technology Beijing 100124P.R.China

Spontaneous polarization was found in Ta_(2)O_(5)dielectric ceramics prepared by laser sintering *** heat corrosion,90°and 180°domains in the ceramics was observed by field emission scanning electron *** crystal structure of the laser-si ntered ceramics at RT was determined as monocinic phase,which indicates the lattice distortion existed in the *** variation of O-Ta-O bending vibration mode was deduced from the variation of phonon mode at the low wave-mumber(57 cm^(-1)and 250cm^(-1)).The enhancement of effective electric field for tantalum atoms due to the lattice distortion was determined by calculation of charge distribution *** distortion of crystal structure due to the phase transformation from higher symmetric orthorhombic phase to lower symmetric monoclinic phase expl ained spontaneous polarization in the laser-sintered Ta_(2)O_(5)ceramics.

关键词： Spontaneous polarization tantalum-pentoxide domain dielectric ceramic

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RESEARCH ON THE APPLICATIONS OF dielectricceramic IN MICROWAVE OVEN

RESEARCH ON THE APPLICATIONS OF DIELECTRICCERAMIC IN MICROWA...

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2010全国压电和声波理论及器件技术研讨会

作者： Tong-zan LIU~1,Rong HUANG~2,Fen XIAO~(1*) 1 Department of Physics,Xiamen University,Xiamen 361005,China 2 Hubei Radio & Television University,Wuhan 430070,China

The attributes of microwave dielectric ceramic have been studied from two aspects:working state and relative dielectric *** its four applications in microwave oven are *** in resonant state can be used in microwave oven of fixed boundary condition;ceramics in detuned state are made into shimming panel;high permittivity ceramics are used to make flexible fast defroster and low permittivity ceramics are used in multiple outputs shimming device in microwave ***,all these applications have been applied for national invention patents,some of which have been produced into samples and got favorable test data.

关键词： Relative dielectric constant resonant state microwave oven dielectric ceramic

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