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Effects of uniaxial stress on dielectric properties lead magnesium niobate–lead zirconate titanate ceramics

2003; Institute of Physics; Volume: 36; Issue: 13 Linguagem: Inglês

10.1088/0022-3727/36/13/329

1361-6463

Rattikorn Yimnirun, Supon Ananta, Ekarat Meechoowas, Supattra Wongsaenmai,

Multiferroics and related materials

Effects of uniaxial stress on the dielectric properties of ceramics in lead magnesium niobate–lead zirconate titanate (PMN–PZT) system are investigated. The ceramics with a formula (x)Pb(Mg1/3Nb2/3)O3–(1−x)Pb(Zr0.52Ti0.48)O3 or (x)PMN–(1 − x)PZT when x = 0.0, 0.1, 0.3, 0.5, 0.7, 0.9, and 1.0 are prepared by a conventional mixed-oxide method. Phase formation behaviour and microstructural features of these ceramics are studied by x-ray diffraction and scanning electron microscopy methods, respectively. The dielectric properties under the uniaxial stress of the PMN–PZT ceramics are observed at stress levels up to 5 MPa using a uniaxial compressometer. It is found that with increasing applied stress the dielectric constant of the PZT-rich compositions increases slightly, while that of the PMN-rich compositions decreases. On the other hand, the dielectric loss tangent for most of the compositions first rises and then drops with increasing applied stress.