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Integrated Ferroelectrics
An International Journal
Volume 67, 2004 - Issue 1
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Original Articles

Phase Transition Study on Degenerate Modes of Pb(Yb1/2Nb1/2)O3 and Pb(Yb1/2Ta1/2)O3

Sang-Jin Ahn Department of Physics, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Korea
,
Jong-Jean Kim Department of Physics, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Korea
,
Jai-Hyun Kim Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon, 305-701, Korea
&
Woong-Kil Choo Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon, 305-701, Korea
Pages 159-166 | Received 01 Apr 2004, Accepted 01 Aug 2004, Published online: 12 Aug 2010
 
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Abstract

Pb(Yb1/2Nb1/2)O3 [PYN] and Pb(Yb1/2Ta1/2)O3 [PYT] are highly ordered enough to be a prototype for spectroscopic studies of complex lead-based perovskite compounds Pb(B′, B″)O3 system. We find out changes in the numbers of vibrational mode at each phase by Raman scattering. PYN based antiferroelectrics have the modes with the triple degeneracy. It may originate from antiparallel arrangements of cations and the accompanied octahedral tilting. PYT systems display an additional degeneracy as lowering a temperature. These results implicate Raman spectroscopy is more efficient than other methods for characterizing phases of PYN and PYT.

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