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Ferroelectrics Letters Section Volume 36, 2009 - Issue 1-2
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Original Articles

Ferroelectric-Relaxor Behavior of 0.8BaTiO3-0.2(Na1/4Bi3/4)(Mg1/4Ti3/4)O3 Ceramic

LIYING WU Department of Applied Physics, Xi'an Jiaotong University, Xi'an, 710049, China; Department of Electrical and Computer Engineering, University of Texas at San Antonio, San Antonio, TX, 78249, USA
,
XIAOLI WANG Department of Applied Physics, Xi'an Jiaotong University, Xi'an, 710049, China
,
JIMMY H. WANG Department of Electrical and Computer Engineering, University of Texas at San Antonio, San Antonio, TX, 78249, USA
,
RUYAN GUO Department of Electrical and Computer Engineering, University of Texas at San Antonio, San Antonio, TX, 78249, USA
&
AMAR S. BHALLA Department of Electrical and Computer Engineering, University of Texas at San Antonio, San Antonio, TX, 78249, USA
Pages 28-36 | Received 28 Oct 2008, Published online: 27 May 2009
 
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Abstract

An onset of ferroelectric-relaxor like behavior of 0.8BT-0.2NBMT ceramics is studied in the temperature range from 15K to 573K. A broad dielectric peak with relatively high dielectric maximum shows frequency dispersion. The dielectric constant follows the modified Curie-Weiss law with the γ = 1.65. The relaxation rate follows the Vogel-Fulcher relaxation with E = 0.496 eV and TVF = 104.43K. The polarization hysteresis loops are observed with a small remnant polarization of 2.5 μ C/cm2 at room temperature.

ACKNOWLEDGMENT

The authors acknowledge the support of National Natural Science Foundation of China (Project 50772087), and NSF/US to carry out this work. Liying Wu also is thankful for the scholarship from China Scholar Council for the program of national study-abroad project for postgraduates of high level universities.

Communicated by Dr. George W. Taylor

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