原位高温拉曼散射研究单斜 AgMoO 微米棒。
In situ high-temperature Raman scattering study of monoclinic AgMoO microrods.
机构信息
Departamento de Física, Centro de Ciências Exatas e Tecnologia, Universidade Federal do Maranhão, CEP 65080-80, São Luís, MA, Brazil.
Lyman Laboratory of Physics, Harvard University, Cambridge, MA 02138, USA.
出版信息
Spectrochim Acta A Mol Biomol Spectrosc. 2023 Jul 5;295:122632. doi: 10.1016/j.saa.2023.122632. Epub 2023 Mar 17.
In this work, we present a temperature-dependent behavior of monoclinic silver dimolybdate (m-AgMoO) microrods using in situ Raman scattering. The m-AgMoO microrods were obtained by the conventional hydrothermal method at 423 K for 24 h. The structural and morphological characterization of the sample has been done by powder X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. Temperature-dependent Raman scattering measurements were performed on m-AgMoO microrods, and the results show an irreversible first-order structural phase transition at 698 K-723 K and the melting process at 773 K. Changes in the Raman spectra confirm the phase transition from the P2/c monoclinic structure to the P-1 triclinic structure. No morphological changes were observed during the structural phase transition of the sample at 723 K. Time-dependent optical microscopy at 773 K showed the growth of nanowires on the AgMoO microrods in the triclinic structure.
在这项工作中，我们使用原位拉曼散射研究了单斜银二钼酸盐（m-AgMoO）微米棒的温度依赖性。m-AgMoO 微米棒是通过常规水热法在 423 K 下反应 24 小时得到的。通过粉末 X 射线衍射（XRD）和扫描电子显微镜（SEM）分别对样品的结构和形貌进行了表征。对 m-AgMoO 微米棒进行了温度相关的拉曼散射测量，结果表明在 698 K-723 K 发生了不可逆的一级结构相变，在 773 K 发生了熔融过程。拉曼光谱的变化证实了从 P2/c 单斜结构到 P-1 三斜结构的相变。在 723 K 时，样品的结构相变过程中没有观察到形貌变化。773 K 时的时变光学显微镜显示，在三斜结构的 AgMoO 微米棒上生长出了纳米线。
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