%0 Journal Article
%T ON THE SPONTANEOUS CONFIGURATION OF FERROELECTRIC-FERROELASTIC MATERIALS<br>关于铁电铁弹材料的自然构形
%A Zhang Ying
%A <br>张颖
%J 力学学报
%D 2000
%I 
%X The behavior of ferroelectric-ferroelastic materials depends upon their microstructures. Nonuniqueness of spontaneous deformations and directions of spontaneous polarization, and existence of various singular surfaces in such a material cause the spontaneous configuration of a ferroelectric-ferroelastic material to have an intricate structure. In this work, a nonconvex energy density of deformation gradients and of electric displacements is assumed for ferroelectricferroelastic single crystals. From an energetic point of view, necessary conditions for a stable spontaneous configuration are derived. It is concluded that the stable spontaneous configuration of a ferroelectric- ferroelastic polycrystalline material consist s of a coarse mixture of various ferroelectric domains. The volume fractions of the domains with the same spontaneous deformation gradient depend upon the orientations of the grain boundaries, the orientations of crystal lattices, and the twinning mode.
%K ferroelectric-ferroelastic
%K spontaneous polarization
%K non-convex stored energy
%K micro-
%K structure
%K coarse mixture
%K electric domain
%K stable configuration<br>自极化
%K 稳定构形
%K 铁电铁弹材料
%K 自然构形
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=5D344E2AD54D14F8&jid=4100DA4A1A3BA1B0CE5AD99AE1DFB420&aid=74D902708C36A5B5&yid=9806D0D4EAA9BED3&vid=9971A5E270697F23&iid=0B39A22176CE99FB&sid=527AEE9F3446633A&eid=8B59EA573021D671&journal_id=0459-1879&journal_name=力学学报&referenced_num=0&reference_num=4