{110}_(cub)切型Pb(Mg_(1/3)Nb_(2/3))O_3-PbTiO_3单晶铁电相变的研究

Phase Transitions of Pb(Mg_(1/3)Nb_(2/3))O_3-PbTiO_3 Single Crystal with {110}_(cub) Cut

测试了PMNT68/32{110}cub切型单晶的介电、压电性能和电滞回线,发现单晶铁电性能与所施加的极化电场及单晶中PbTiO3含量的变化密切相关.研究结果表明,相结构的变化是引起铁电性能变化的主要原因,即在<110>取向施加电场诱导出来的正交相是本征亚稳的,它的稳定性不仅取决于所施加的极化电场大小,而且与单晶中PbTiO3含量的变化密切相关.

The dielectric and piezoelectric properties, polarization vs E-field curves of Pb(Mg1/3Nb2/3)O-3-PbTiO3 single crystal were measured. Results show that the ferroelectric properties strongly depend on the composition and poling field. These are essentially attributed to the intrinsic metastable orthorhombic ferroelectric state, whose phase stability depends on the composition and poling field intensively.