X-ray Analysis of PLZT Solid Solution Formed under Hydrothermal Conditions

Abstract

Abstract: PLZT solid solutions formed under different hydrothermal conditions (130~220℃,c_KOH=1~5mol/L, Zr/Ti( molar ratio)=0/10~10/0,c_La=0~20%,Pb/( Z+Ti)(molar ratio) =1.0~1.7,reaction time 2 h) were investigated by means of XRD.Incorporating La³⁺ ion into the lattice of PZTsolid solution to substitute Pb²⁺ or Zr⁴⁺ and Ti⁴⁺ions was difficult under above hydrothermal conditions.The La³⁺could exist in the grain boundary zone or be adsorbed on the surface of PZTparticles, and in corporated gradually into the lattice of PZTwith further heat-treatment.A-site substitution was easy to occur in the tetragonal phase zone of solid solution to result in shrinkage of the cell volume of solid solution,Asite and B-site substitutions could occur simultaneously in the rhombohedral phase zone to keep the cell volume unchanging essentially.The existence of La was in favour of the formation of solid solution in the tetra-rhomb morphotropic phase boundary zone.The reaction temperature and concentration of mineralizer KOH have a significant effect on the formation and morphology of solid solution products.

Key words: PLZT, Hydrothermal synthesis, Electrooptic ceramics

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CHENG Hu-Min, JIAO Jing, MA Ji-Ming, ZHAO Zhen Guo, QI Li-Min. X-ray Analysis of PLZT Solid Solution Formed under Hydrothermal Conditions[J]. Chem. J. Chinese Universities, 1996, 17(8): 1253.

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X-ray Analysis of PLZT Solid Solution Formed under Hydrothermal Conditions

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