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Relaxor ferroelectrics vs proper ferroelectrics<br />

proper FE PbTiO3 10 3 ε<br />

8<br />

6<br />

4<br />

2<br />

673<br />

FE<br />

773<br />

Temperature / K<br />

dielectric permittivity ε<br />

PE<br />

873<br />

relaxor FE<br />

10 3 ε<br />

Temperature / K<br />

PbMg 1/3Nb 2/3O 3<br />

high ε in relatively wide T range near RT<br />

→ multifunctionality!

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