工艺参数对铌酸铅镁微观组织性能的影响

A. Bhakar, Adityanarayan H. Pandey, M. Singh, A. Upadhyay, A. Sinha, S. M. Gupta, T. Ganguli, S. Rai
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引用次数: 13

摘要

采用同步加速器粉末x射线衍射(XRD)和随后详细的Rietveld分析方法对铌酸铅镁(PMN)样品的R3m相极性纳米区(pnr)的微观结构特性进行了研究。在不同的样品处理条件下合成了PMN样品。采用多相Rietveld细化法对不同PMN样品的各向同性显微结构进行了室温同步加速器粉末XRD谱线展宽分析。在Rietveld细化方法中,钙钛矿PMN的两相是与pnr相对应的准电立方相(Pm m)和局部菱形相(R3m)。观察到极性菱形相(R3m)尺寸展宽的高斯分量和准电立方相(Pm m)应变展宽的洛伦兹分量的贡献是合适的,可以对所有PMN样品的同步辐射XRD数据进行满意的Rietveld细化。随着加工温度的升高,pnr (R3m相)的体积平均晶粒尺寸几乎不变(约为12 nm),而其重量百分比则增加。热压试样的准电立方相(Pm m)的表观微应变值较大。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effect of processing parameters on microstructural properties of lead magnesium niobates
The synchrotron powder X-ray diffraction (XRD) and subsequent detailed Rietveld analysis of lead magnesium niobate (PMN) samples were performed to study the microstructural properties of polar nanoregions (PNRs) of the R3m phase. PMN samples were synthesized under different sample processing conditions. The line profile broadening analysis of room-temperature synchrotron powder XRD patterns was performed using the multi-phase Rietveld refinement method for isotropic microstructural evaluation of different PMN samples. The two phases of perovskite PMN considered in the Rietveld refinement approach for satisfactorily fitting the XRD patterns are the paraelectric cubic phase (Pm m) and the local rhombohedral phase (R3m) which corresponds to the PNRs. It is observed that the contributions of the Gaussian component of size broadening of the polar rhombohedral phase (R3m) and the Lorentzian component of strain broadening of the paraelectric cubic phase (Pm m) are apposite for satisfactory Rietveld refinement of the synchrotron XRD data for all PMN samples. The volume-average crystallite size of PNRs (R3m phase) is almost invariant (approximately 12 nm) with increasing processing temperature while their weight percentage increases. The values of the apparent microstrain in the paraelectric cubic phase (Pm m) are larger for hot-pressed samples.
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