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Home  >  Journal list  >  Journal of the Ceramic Society of Japan ( 2003 - 2007 )  >  Vol.112  No.1301 (January) (2004)  >  pp.40-45

Journal of the Ceramic Society of Japan ( 2003 - 2007 )
<<Previous article Vol.112  No.1301 (January) (2004)   pp.40 - 45 Next article>>

Relation between the Crystal Structure, Physical Properties and Ferroelectric Properties of PbZrxTi1−xO3 (x=0.40, 0.45, 0.53) Ferroelectric Material by Heat Treatment

Yasushi IDEMOTO1), Hiroyuki YOSHIKOSHI1), Nobuyuki KOURA1), Ken TAKEUCHI2), James W. RICHARDSON, Jr.3) and Chun-K. LOONG3)
1) Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science
2) Faculty of Industrial Science and Technology, Tokyo University of Science
3) Intensed Pulsed Neutron Source Division, Argonne National Laboratory


  Ferroelectric random access memory (FeRAM) is expected to be the next generation memory. PbZrxTi1−xO3 (PZT) is considered as a candidate because of its high remanent polarization (Pr). We investigated the relation between physical properties, crystal structure and ferroelectric performance of the sample before and after various heat treatments. From the results, remanent polarization (Pr) and coercive field (Ec) increased with increasing PO2 during heat treatment. The remanent polarization (Pr) and coercive field (Ec) decreased with increasing Zr content x. Furthermore, the dielectric constants at room temperature increased with increasing Zr content x. On the other hand, Curie Temperature (TC) increased with decreasing Zr content x or increasing PO2 during heat treatment. From the structural analysis, the bond length of M(Zr,Ti)-O1 decreased with increasing PO2 during heat treatment or with decreasing Zr content x of pre-heated samples. Consequently, the ferroelectric performance was affected by changing the defect of oxygen and the strain of the structure.


Keyword:
Ferroelectric material, Crystal structure, Neutron diffraction analysis, Heat treatment, Physical property, PZT, Ferroelectric property

Received: August 11, 2003
Accepted: November 27, 2003 , Published online: January 23, 2004
Copyright (c) 2004 The Ceramic Society of Japan

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