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Integrated Ferroelectrics
An International Journal
Volume 73, 2005 - Issue 1
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SECTION B: TESTING AND CHARACTERIZATION

PHASE TRANSITION IN Pb(Mg1/3Nb2/3)0.68TiO0.32O3 SINGLE CRYSTAL

PENG BAO Department of Physics, National Laboratory of Solid State Microstructures, Nanjing University, Nanjing, 210093, China
,
FENG YAN Department of Engineering, University of Cambridge, Cambridge, CB2 1PZ, UK
,
XIAOMEI LU Department of Physics, National Laboratory of Solid State Microstructures, Nanjing University, Nanjing, 210093, China
,
JINSONG ZHU Department of Physics, National Laboratory of Solid State Microstructures, Nanjing University, Nanjing, 210093, China
,
HUIMEI SHEN Department of Physics, National Laboratory of Solid State Microstructures, Nanjing University, Nanjing, 210093, China
,
YENING WANG Department of Physics, National Laboratory of Solid State Microstructures, Nanjing University, Nanjing, 210093, China
&
HAOSU LUO Shanghai Institute of Ceramics, Chinese Academy of Sciences 215, Chengbei Rd., Jiading, Shanghai, 201800, China
 show all
Pages 157-164 | Received 17 Apr 2005, Published online: 11 Oct 2011
 
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ABSTRACT

Phase transition of (001)-cut Pb(Mg1/3Nb2/3)0.68Ti0.32O3(PMNT32%) single crystal have been investigated by polarizing light microscopy in the temperature ranged form room temperature to 200 K. The transformation from monoclinic (MA) to cubic (C) phase through an intermedial monoclinic (MC) phase, i.e. MA-MC-C, was observed in the heating run, and the C-MC-MA phase transition sequence was observed in the cooling run. The temperature-induced rotation of extinction position, which was the result of polarization rotation, was observed in MC phase. It is interesting that tetragonal (T) phase has not been reached before the MC phase turn into cubic phase. The existing phase diagram for PMNT system was improved by this experimental result. In addition, it was found the phase transition processes of MC-MA and cubic-MC show distinct characters though both of they are first-order.

Keywords:

Acknowledgments

Current address: Department of Engineering, University of Cambridge, Cambridge, CB2 1PZ, UK

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