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首页> 外文期刊>Crystal growth & design >X-ray Diffraction Study of a Large-Scale and High-Density Array of One-Dimensional Crystalline Tantalum Pentoxide Nanorods
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X-ray Diffraction Study of a Large-Scale and High-Density Array of One-Dimensional Crystalline Tantalum Pentoxide Nanorods

机译:一维五氧化二钽钽纳米棒的大规模高密度阵列的X射线衍射研究

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摘要

In this study we synthesized a new morphological form of tantalum pentoxide (Ta2O5), one-dimensional (1D) nanorod arrays, via hot filament metal vapor deposition. Field-emission scanning electron microscopy (FESEM) showed the 1D Ta2O5 nanorods to be arranged in a large-area and high-density array about 20-25 nm wide and approximately 500 nm long. Energy dispersive spectroscopy (EDS) analysis verified the presence of only the elements Ta and O. X-ray diffractometry (XRD) revealed the crystalline nature of the 1D Ta2O5 nanorods, which included the tetragonal (alpha) phase and orthorhombic (beta) phases at a low temperature of 80 K. The XRD patterns of the 1D Ta2O5 nanorods indicated complex, polymorphic thermochromic phase transformations, which incorporate: (i) alpha to alpha (alpha-alpha); (ii) alpha-alpha-beta (iii) beta to beta (beta-beta); (iv) beta to alpha (beta-alpha); and (v) alpha-beta-alpha phase transitions at elevated temperatures ranging from 80 to 750 K.
机译:在这项研究中,我们通过热丝金属气相沉积法合成了一种新的形态形式的五氧化二钽(Ta2O5),一维(1D)纳米棒阵列。场发射扫描电子显微镜(FESEM)显示,一维Ta2O5纳米棒以约20-25 nm宽和约500 nm长的大面积和高密度阵列排列。能量色散光谱(EDS)分析证实只有Ta和O元素存在。X射线衍射(XRD)显示一维Ta2O5纳米棒的晶体性质,其中包括四方(α)相和正交晶(β)相。一维Ta2O5纳米棒的XRD图谱表明存在复杂的多态热致变色相变,该相变包括:(i)α至α(alpha-alpha); (ii)alpha-alpha-beta(iii)beta到beta(beta-beta); (iv)Beta到alpha(beta-alpha); (v)在80至750 K的高温下,α-β-α相变。

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