Abstract
ABSTRACTDielectric permittivities under the dc field applied along the [001]c direction (in the cubic coordinate) have been measured in Pb(Zn1/3Nb2/3)O3-7% PbTiO3 (PZN-7%PT), and the ferroelectric critical endpoint (CEP) has been found at 171 °C and 1.3 kV/cm on the temperature-field phase diagram. Near the critical tempeature, the dielectric tunability has been studied with the emphasis put on its temperature dependence. A large dielectric tunability of 92.8% in the maximum field of 10 kV/cm is obtained near 170 °C, and high-tunabilities more than 60% is found in a temperature range between 165 °C and 200 °C in PZN-7%PT. Dielectric tunability above the critical temperature has been discussed within the Landau theory.
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