The 65h JSAP Spring Meeting, 2018

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9 Applied Materials Science » 9.1 Dielectrics, ferroelectrics

[20p-F104-1~11] 9.1 Dielectrics, ferroelectrics

Tue. Mar 20, 2018 1:45 PM - 4:45 PM F104 (61-104)

Hajime Nagata(Tokyo Univ. of Sci.), Satoshi Wada(Univ. of Yamanashi), Takaaki Morimoto(Waseda Univ.)

2:30 PM - 2:45 PM

[20p-F104-4] Polarization Growth in the Paraelectric Phase of 0.6Pb(Mg1/3Nb2/3)O3-0.4PbTiO3 Relaxor Ferroelectric

〇Desheng Fu1, Wei Zhao2, Guorong Li2, Mitsuru Itoh3 (1.Shizuoka University, 2.Shanghai Institute of Ceramics, 3.Tokyo Institute of Technology)

Keywords:ferroelectric, polarization, dielectric constant

(1-x)Pb(Mg1/3Nb2/3)O3-xPbTiO3 ((1-x)PMN-xPT) with x>0.3 is commonly considered to be a classical ferroelectric and its dielectric constant is expected to follow the classical Cuire-Weiss law. In contrast to this expectation, we found that the dielectric constant of PMN-PT with x=0.4 dosen't follow the Cuire-Weiss law, and it actually follows an exponetial law around Tc in the paralectric phase. This exponenial change in dielectric constant with temperature is essentially due to the exponetial growth of the local plarization in paraelectric phase as observed experimentally.