X-ray and dielectric studies of Sc-substituted Pb(Yb1/2Nb1/2)O-3 ceramics

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The crystal structure and the dielectric properties of (1-x)Pb(Yb1/2Nb1/2)O3-xPb(Sc1/2Nb1/2)O-3 (PYN1- xPSNx) (0less than or equal to x less than or equal to 0.50) solid solution have been studied. According to our XRD study, the room temperatures crystal structure of PYN1- xPSN(x) becomes pseudocubic from the PYN's orthothombic with increasing x. Also the diffraction line intensities ascribed respectively to the AFE lattice modulation and the B-site ordering become gradually weaker and they disappear altogether for x > 0.30. In the PYN-rich composition range (0 less than or equal to x less than or equal to 0.30), the paraelectric(PE)-antiferroelectric(AFE) phase transition occurs sharply and is independent of the applied frequency. However, on further increasing Sc concentration (0.30 < x <= 0.50), the dielectric constant vs. temperature curve becomes gradually broader and begins to display a frequency-dependent relaxor behavior.
Publisher
TAYLOR &amp; FRANCIS LTD
Issue Date
2002
Language
English
Article Type
Article; Proceedings Paper
Citation

FERROELECTRICS, v.270, pp.1255 - 1260

ISSN
0015-0193
URI
http://hdl.handle.net/10203/82387
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