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Ferroelectrics Volume 326, 2005 - Issue 1
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Original Articles

Ferroelectric Phase Transition in Pb[(Mg3/4Zn1/4)1/3Nb2/3]O3 Ceramic

Amit Kumar Department of Physics, Materials Research Laboratory, University, T. M. Bhagalpur University, Bhagalpur, 812007, India
,
K. Prasad Department of Physics, Materials Research Laboratory, University, T. M. Bhagalpur University, Bhagalpur, 812007, India
,
S. N. Choudhary Department of Physics, Materials Research Laboratory, University, T. M. Bhagalpur University, Bhagalpur, 812007, India
&
R. N. P. Choudhary Department of Physics & Meteorology, Indian Institute of Technology, Kharagpur, 7211302, India
Pages 67-72 | Accepted 10 Apr 2005, Published online: 09 Mar 2011
 
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Pb[(Mg 3/4 Zn 1/4 ) 1/3 Nb 2/3 ]O 3 (PMZN) ceramic was prepared by columbite precursor method. The structural analysis revealed the cubic phase of PMZN at room temperature. Dielectric studies show the relaxor behaviour with diffuse phase transition. The transition temperature (T m ) was found to be at 40°C at 1 kHz. The frequency dependence T m has been modeled using Vogel-Fulcher relation. The dielectric relaxation in PMZN is found analogous to the magnetic relaxation in spin-glass system. The relaxor behaviour in PMZN has also been examined through admittance spectroscopy.

Acknowledgment

This work has been supported by the Department of Science & Technology (DST), New Delhi (Ref. No.: SP/S2/M-15/97). One of us (KP) wishes to thank Dr. A. A. Bokov, Simon Fraser University, British Columbia, Canada for his useful discussion.

Paper originally presented at AMF-4, Bangalore, India, December 12ndash;15, 2003

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