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《Chinese Journal of Materials Research》 2005-05
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Composition dependence of the structures and electrical properties of Pb(Mg_(1/3)Nb_(2/3)O_3-PbTiO_3 single crystals

XU Guisheng WANG Xiaofeng YANG Danfeng DUAN Ziqing (R&D Center of Synthetic Crystals, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 201800)  
The relaxor-based ferroelectric single crystal 0.90Pb(Mg1/3Nb2/3)O3 -0.10PbTiO3 (PMNT90/10) with the size of 40 mm in diameter and 80 mm in length was grown by a modified Bridgman technique. This suggests that the technique is suitable for the growth of PMNT crystals with lower PT content as well as those near the morphotropic phase boundary (MPB). PMNT90/10 crystal had the structure of a ferroelectric phase coexisting with a paraelectric one. A peculiar sub-microdomain was found within the ferroelectric phase-predominated regions. With the changing of the compositions from PMN to PMNT near MPB, the ferroelectric domains evolve in the order of microdomain-sub-microdomain-irregular macrodomain-regular macrodomain, and the relaxor behavior becomes weak gradually. Moreover, PMNT90/10 crystal on the (001) cut exhibits lower values of piezoelectric constant d33 (80 pC/N) and higher values of dielectric constantε (12, 6000) than the crystals near MPB.
【Fund】: 国家自然科学基金50072038资助项目~~
【CateGory Index】: TB34;
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