图 衍射谱线形分析 ·定义阝=峰宽 Bobserved-Binstrumental +Bstrain and particle size ·阝。=B+B Gaussian ·B,=β。-B;(Lorentzian) -·,Lorentzian ·B,2=β2-β，2(Gaussian) FWHM ·B=VB。-B)VB-P) 20。 材料科学与工程学院 7 School of Materials Science and Engineering材料科学与工程学院 School of Materials Science and Engineering 衍射谱线形分析 7 • 定义  = 峰宽 • observed = instrumental + strain and particle size • o = i + r • r = o - i (Lorentzian) • r 2 = o 2 - i 2 (Gaussian) •