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Taking laser as the heat source for ceramic sintering, 0.94K(0.5)Na(0.5)NbO(3)-0.06LiTaO(3) ceramics with unique physical properties were prepared. Fine ferroelectric properties with remnant polarization of 18 mu C/cm(2) and coercive field of 18.8 kV/cm were obtained. The piezoelectric properties and density of the ceramics were d(33)similar to 120 pC/N, k(P)similar to 36.6%,T-C similar to 420 degrees C, and rho similar to 4.125 g/cm(3). The shift of the two phase transition temperatures (tetragonal-orthorhombic phase transition temperature TO-T shifting to 100 degrees C from 190 degrees C while Curie temperature T-c shifting to 420 from 394 degrees C) in laser-sintered ceramics reflects large structure distortion of phase transition and Li+ substitution of high temperature phase. Orientation degree of the texture structure based on anisometric grains of submicron diameter in the ceramics was 23%. The texture structure corresponding to the fine ferroelectric properties was resulted from the mass transform in liquid phase and strictly heating directivity of laser irradiation. O-2 discharge through coaxial nozzle lakes some actions like O-2 annealing and effectively suppression on the volatilization of Na2O during laser sintering. Lager substitution of Li+ leads to the presence of small amount of K3Li2Nb5O15 phase damaging in d(33). By analysis of the sintering effects on the properties and structure evolution, laser sintering was shown as a promising method in preparation of functional ceramics with excellent and applicable physical properties, compared to a traditional furnace sintering method. (C) 2009 Laser Institute of America.
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JOURNAL OF LASER APPLICATIONS
ISSN: 1042-346X
年份: 2009
期: 3
卷: 21
页码: 124-128
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