10ZHOU Lan (Institute of Technology, Yangzhou University Yangzhou 225009) ZHANG Shuyi (Institute of Acoustics and Lab. of Modem Acoustics, Naujing University Nanjing 210093) ZHANG Wei,ZHANG Lide (Institute of Solid Physics, Chinese Academy of Sciences Hefe.Photoacoustic spectra studies of nanometer BaTiO_3[J].Chinese Journal of Acoustics,1998,17(2):135-142.