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首页> 外文期刊>Materials Characterization >Microstructural and compositional study of a bulk Pb(Mg_(1/3)Nb_(2/3)) O_3-PbTiO_3 single crystal grown from a BaTiO_3 seed
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Microstructural and compositional study of a bulk Pb(Mg_(1/3)Nb_(2/3)) O_3-PbTiO_3 single crystal grown from a BaTiO_3 seed

机译：BaTiO_3种子生长的块状Pb（Mg_（1/3）Nb_（2/3））O_3-PbTiO_3单晶的微结构和组成研究

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摘要

The microstructure, composition and homogeneity of a Pb(Mg_(1/3)Nb_(2/3)) O_3-PbTiO_3 (PMNT) single crystal were studied using a combination of electron-microprobe techniques: scanning electron microscopy, orientation analysis and quantitative X-ray microanalysis. A PMNT single crystal was grown from a polycrystalline PMNT matrix using a BaTiO_3 single crystal as a seed. The PMNT crystal retained the same crystallographic orientation as the seed with no interdiffusion at the interface. The average chemical composition, determined with optimized quantitative wavelength-dispersive X-ray microanalysis, was Pb(Mg_(1/3)Nb_(2/3)) O_3-PbTiO_3 where x=0.33. A statistical evaluation of the data using the analysis of variance showed that the achieved experimental uncertainty was below + - 1 percent relative. The compositional homogeneity of the crystal was verified on the micrometer-scale; however on the macro-scale slight fluctuations of the Mg, Nb and Ti concentrations were observed across the crystal. The measured variations from the average composition were + - 2.3 percent relative for Ti, + - 1.3 percent for Nb and + - 1.4 percent for Mg. In contrast, the Pb concentration was found to be uniform on both the micro- and macro-scale, showing a variation below + - 0.5 percent relative.
机译：结合电子探针技术研究了Pb（Mg_（1/3）Nb_（2/3））O_3-PbTiO_3（PMNT）单晶的微观结构，组成和均匀性：扫描电子显微镜，取向分析和定量X射线显微分析。使用BaTiO_3单晶作为种子，从多晶PMNT基质中生长PMNT单晶。 PMNT晶体保持与晶种相同的晶体学取向，界面处无相互扩散。通过优化的定量波长色散X射线显微分析确定的平均化学组成为Pb（Mg_（1/3）Nb_（2/3））O_3-PbTiO_3，其中x = 0.33。使用方差分析对数据进行统计评估表明，所获得的实验不确定性相对低于+ 1％。在微米尺度上验证了晶体的组成均匀性;然而，从宏观上看，整个晶体中的Mg，Nb和Ti浓度略有波动。与平均组成相比，测得的变化相对于Ti为+-2.3％，对于Nb为+-1.3％，对于Mg为+-1.4％。相反，Pb的浓度在微观和宏观上都是均匀的，相对变化低于±0.5％。

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