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总览 评价 倪勇 * ( 材料力学行为与设计中科院重点实验室,近代力学系,中国科学技术大学,合肥,安徽,230026; ) 摘要: 三维相场模拟发现了一种相分解铁电固溶体中四方相与正交相共存的一种混合畴结构。该结构有别于传统含准同型相界铁电体内观测到的四
倪勇*
(
材料力学行为与设计中科院重点实验室,近代力学系,中国科学技术大学,合肥,安徽,230026; )
摘要:
三维相场模拟发现了一种相分解铁电固溶体中四方相与正交相共存的一种混合畴结构。该结构有别于传统含准同型相界铁电体内观测到的四方相菱方相共存畴结构。该结构的形成取决于极化各向异性能与相畴界由于弹性和静电相容性导致的弹性,静电相互作用能之间的竞争。
关键词:
相共存,铁电畴,相场法,准同型相界
Y. Ni*
(
CAS Key Laboratory of Mechanical Behavior and Design of Materials, University of Science and Technology of China; )
Abstract:
Three-dimensional computational modeling and theory predicts new feature of two-phase coexistence, i.e. appearance of a tetragonal-orthorhombic mixed state, other than conventional tetragonal-rhombohedral coexistence of decomposing Pb(Zr1-xTix)O3 (PZT) ferroelectric solid solutions near the morphotropic phase boundary (MPB). It shows that the new phase-coexistence state is formed through the phase with weak polar anisotropy loosening the rotational stability of polarization, driven by significantly decreasing the energy due to the deformation and polarization incompatibility between two phases.
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