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首页> 外文期刊>Acta Crystallographica, Section B. Structural science, crystal engineering and materials >Effect of processing parameters on microstructural properties of lead magnesium niobates
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Effect of processing parameters on microstructural properties of lead magnesium niobates

机译：加工参数对铅铌酸盐微观结构性质的影响

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摘要

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 (Pm3m) 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 (Pm3m) 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 (Pm3m) are larger for hot-pressed samples.
机译：进行同步粉X射线衍射（XRD）和随后的铌酸镁（PMN）样品的详细RIETVELD分析，以研究R3M相的极性纳米导板（PNR）的微观结构性能。在不同的样品加工条件下合成PMN样品。使用多相RIETVELD细化方法进行室温同步细胞粉末XRD模式的线轮廓拓宽分析，用于不同PMN样品的各向同性微观结构评估。在RIETVELD细化方法中考虑的钙钛矿PMN的两相对于令人满意地拟合XRD图案，是对应于PNR的局部核立方相（PM3M）和局部菱形相（R3M）。观察到，高斯分量的大小扩大极性菱形相（R3M）和洛伦西亚元件对节电立方相（PM3M）的延展的洛伦矶分量是令人满意的，用于所有PMN的同步XRD数据的令人满意的RIETVELD细化样品。 PNR（R3M相）的体积平均微晶尺寸几乎不变（约12nm），加工温度增加，同时其重量百分比增加。对于热压样品，节电立方相（PM3M）中的表观微陶器的值较大。

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