Artículos de revistas
Investigation on dielectric response of PMN ceramics around paraelectric-ferroelectric diffuse phase transition
Fecha
2009-11-01Registro en:
Materials Science and Technology. Leeds: Maney Publishing, v. 25, n. 11, p. 1316-1320, 2009.
0267-0836
10.1179/026708309X12474766656263
WOS:000272049300005
6725982228402054
Autor
Universidade Federal de Uberlândia (UFU)
Universidade Estadual Paulista (Unesp)
Institución
Resumen
The dielectric properties of relaxor ferroelectric lead magnesium niobate Pb(Mg(1/3)Nb(2/3))O(3) (PMN) ceramics have been investigated. These studies were conducted taking into account the characterisations of the complex dielectric permittivity (real and imaginary parts) as a function of temperature and frequency in a wide interval. on the other hand, the dc 'bias' electrical field dependence of the real dielectric permittivity (C-V characterisations) has been analysed around the paraelectric-ferroelectric diffuse phase transition. Results obtained at room temperature (paraelectric phase) showed a typical behaviour of conventional dielectric materials, while measurements performed at 200 K (ferroelectric phase) evidenced an anomalous behaviour for frequencies up to 100 kHz. Such observed anomalies were characterised by two asymmetrical peaks on sweep-up and sweep-down, at -15 and +18 kV cm(-1) respectively.