弛豫铁电材料在准同型相界附近结构和性能研究的最新进展  

Recent Progress in the Study of Structure and Properties of Relaxor Ferroelectrics Near the Morphotropic Phase Boundary

作　　者：张孝文[1] 陈克丕[1] 

机构地区：[1]清华大学材料系新型陶瓷与精细工艺国家重点实验室,北京100084

出　　处：《无机材料学报》2002年第3期385-391,共7页Journal of Inorganic Materials

基　　金：国家自然科学基金(59995522)

摘　　要：铅系钙钛矿结构弛豫铁电材料在准同型相界区域的单晶,因为具有优异的介电、压电性能及潜在的应用前景,近年来已经引起了广泛的重视,本文较详细地介绍了其反常性能的一些特征,以及对其起源在理论及实验观察上的最新进展,重点介绍了自发极化在外场下进行偏转的理论,以及近年来用同步辐射的Ｘ射线衍射实验研究结果,发现在原先以为只有菱方相和四方相的准同型相界区域存在着单斜相．In the region across morphotropic phase boundary (MPB), the single crystal form of lead-based relaxor ferroelectrics with perovskite structure shows superior dielectric and piezoelectric properties. Immense attention has been drawn because of its high application potentials. The characteristics of the abnormal properties of those single crystals were described in this review article. In addition, to explain the ultra-high electromechanical response, a theory of the polarization rotation mechanism was introduced in detail. In the same time the recent synchrotron X-ray powder diffraction measurements which revealed a monoclinic phase between the previously established tetragonal and rhombohedral regions were also introduced.

关 键 词：驰豫铁电材料 准同型相界 结构 性能 铁电单晶 极化偏转 

分 类 号：TM22[一般工业技术—材料科学与工程]