IMPROVING PHYSICAL PROPERTIES OF FUNCTIONAL MATERIALS BY LASER IRRADIATION

摘要

In this paper, the progress on improving physical properties of functional materials by laser irradiation is reported and discussed. Sintered with a CO_(2) laser, a novel Ta_(2)O_(5)-based ceramics with maximum kappa of 450 can be obtained at ambient conditions. The electrical conductivity of PCDF induced by excimer laser irradiation was found to increase from 10~(-13) (OMEGA)~(-1)(centre dot)cm~(-1) to 10~(-4) (OMEGA)~(-1)(centre dot)cm~(-1). Significant improvement in the magneto transport properties of La_(0.67)Ca_(0.33)MnO_(3) thin film irradiated by CO_(2) laser in air can be obtained. Irradiated with a CO_(2) laser, the polarization and piezoelectric constants d_(15) of Ba_(0.5)Sr_(1.5)Na_(0.6)K_(0.4)Nb_(5)O_(15) ceramic was found to increase to 120 pC/N. Based upon the characterization of the samples, the phase, micro-structure, and the mechanism of property modification in laser irradiated samples were analyzed.