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Ferroelectrics Volume 44, 1982 - Issue 1
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Original Articles

Critical exponents of the dielectric constants in diffused-phase-transition crystals

Kenji Uchino Department of Physical Electronics, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo, 152, Japan
&
Shoichiro Nomura Department of Physical Electronics, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo, 152, Japan
Pages 55-61 | Received 17 May 1982, Published online: 07 Feb 2011
 
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Abstract

The critical exponent γ in the relation between the dielectric constant and temperature (1/ε—1/εm = C'-1x (T—Tm)γ) has been determined precisely for relaxor ferroelectrlics Pb(Mg1/3Nb2/3)O3, Pb(Zn1/3 Nb2/3)O3 and a related solid solution 0.88Pb (Zn1/3 Nb2/3)O3-0. I2PbT103, as well as for normal ferroelectrics BaTiO3 and K(Ta0. 55Nb0.45)O3. A high correlation of the γ value with the plase transition diffuseness has been found empirically. Moreover, this γ value is very close to another critical exponent γ* which is defined in the relation between the dielectric constant and hydrostatic pressure (1/ε—1/εm = C* (p—pm)γ*)

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