Phase diagram of pseudobinary Pb(Yb1/2Nb1/2)O-3-Pb(Sc1/2Nb1/2)O-3 ceramic solid solution
Crystal structure and dielectric properties of (1-x)Pb(Yb1/2Nb1/2)O-3-xPb(Sc1/2Nb1/2)O-3 (PYN1-xPSNx) (0less than or equal toxless than or equal to0.60) solid solution have been studied, and its pseudobinary phase diagram has been determined. The low-temperature crystal structure of PYN1-xPSNx becomes pseudocubic from the PYN's orthothombic with increasing x. Also the x-ray diffraction line intensities ascribed, respectively, to the antiferroelectric (AFE) lattice modulation and the B-site ordering become gradually weaker and then they disappear altogether for x>0.37. In the PYN-rich composition range (0less than or equal tox<0.37), the paraelectric (PE)-AFE phase transition occurs sharply and its transition temperature remains independent of the applied frequency. However, on further increasing Sc concentration (0.37<xless than or equal to0.60), the dielectric constant versus temperature curve becomes gradually broader and displays a frequency-dependent ferroelectric (FE) relaxor behavior. Particularly near x=0.37, the frequency-dependent dielectric behavior near the dielectric maximum temperature changes to a frequency-independent one below a specific temperature. Particularly at this composition, this solid solution displays a sequence of PE-metastable AFE-FE-AFE phase transition. (C) 2005 American Institute of Physics.
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Kim, JH Korea Adv Inst Sci & Technol, Dept Mat Sci & Engn, 373-1 Gusong Dong, Taejon 305701, South Korea Korea Adv Inst Sci & Technol, Dept Mat Sci & Engn, Taejon 305701, South Korea Chungang Univ, Dept Chem, Seoul, South Korea Ecole Polytech Fed Lausanne, Swiss Fed Inst Technol, IMX LC, Mat Inst,Ceram Lab, CH-1015 Lausanne, Switzerland
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Record created on 2006-08-21, modified on 2016-08-08