Raman spectroscopic determination of pyrochlore-type compound on the synthesis and decomposition of sol-gel-derived Pb(Mg1/3Nb2/3)O-3 (PMN)

Raman spectroscopy was applied to the sol-gel-derived Pb(Mg1/3Nb2/3)O-3 (PM N) powder and thin film. Pyrochlore-type compound which forms on the synthe sis of PMN contains Mg in the formula (Pb1.86Mg0.24Nb1.76O6.5) instead of P b1.5Nb2O6.5, Pb2Nb2O7, or Pb2.8Nb2O7.8, which have been reported in the lit erature to form on the synthesis of FMN, It is rather difficult to distingu ish these pyrochlore-type compounds by X-ray diffraction since the d-values of these compounds are very close to each other. From the result of Raman spectroscopy, it,vas also clarified that the pyrochlore-type compound forme d by the decomposition of PMN thin film also contains Rig in the formula (P b1.86Mg0.24Nb1.76O6.5) (C) 1999 Academic Press.