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Fabrication of negative thermal expansion ZrMo_2O_8 film by sol-gel method

机译：溶胶-凝胶法制备负热膨胀ZrMo_2O_8薄膜

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摘要

ZrMo_2O_8 film with cubic β-ZrW_2O_8 structure was prepared on glass substrates via the sol-gel dip coating method. The structural, compositional, morphological and thermal expansion properties of the ZrMo_2O_8 film were studied using X-ray diffractometry (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and atomic force microscopy (AFM). The bonding strength of the as-prepared films was measured by scratch testing. The results indicated that crystalline ZrMo_2O_7(OH)_2(H_2O)_2 precursor powders changed into amorphous gel as the coordination reaction of citric acid and polyvinylpyrrolidone (PVP) with metal ions. Cubic β-ZrMo_2O_8 film consisting of balllike particles could be obtained after annealing the gel film, and the bonding strength decreased from 27.8 N (gel film) to 8.7 N (β-ZrMo_2O_8 film). The room temperature lattice parameters of resulting cubic β-ZrMo_2O_8 film are a= b=c-8.976A, and this film exhibited excellent negative thermal expansion (CTE=-8.66×10~(-6) K~(-1)) property from room temperature to 430℃.
机译：通过溶胶-凝胶浸涂法在玻璃基板上制备了具有立方β-ZrW_2O_8结构的ZrMo_2O_8薄膜。利用X射线衍射（XRD），X射线光电子能谱（XPS），扫描电子显微镜（SEM）和原子力显微镜（AFM）研究了ZrMo_2O_8薄膜的结构，组成，形貌和热膨胀性能。通过刮擦试验测量所制备的膜的粘合强度。结果表明，随着柠檬酸与聚乙烯吡咯烷酮（PVP）与金属离子的配位反应，ZrMo_2O_7（OH）_2（H_2O）_2前驱体粉末转变为无定形凝胶。对凝胶膜进行退火后，可获得由球形颗粒组成的立方β-ZrMo_2O_8膜，其结合强度从27.8 N（凝胶膜）降至8.7 N（β-ZrMo_2O_8膜）。所得立方晶β-ZrMo_2O_8薄膜的室温晶格参数为a = b = c-8.976A，且该薄膜具有优异的负热膨胀性能（CTE = -8.66×10〜（-6）K〜（-1））。从室温到430℃。

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  • 来源
    《Materials Science and Engineering》 |2012年第2期|p.263-268|共6页
  • 作者

    Qinqin Liu; Xiaonong Cheng; Juan Yang; Xiujuan Sun;

  • 作者单位

    School of Materials Science and Engineering, Jiangsu University. 301 Xuefu Road. Zhenjiang,Jiangsu 212013, PR China;

    School of Materials Science and Engineering, Jiangsu University. 301 Xuefu Road. Zhenjiang,Jiangsu 212013, PR China;

    School of Materials Science and Engineering, Jiangsu University. 301 Xuefu Road. Zhenjiang,Jiangsu 212013, PR China;

    School of Materials Science and Engineering, Jiangsu University. 301 Xuefu Road. Zhenjiang,Jiangsu 212013, PR China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    negative thermal expansion; ZrMo_2O_8; sol-gel method;

    机译：负热膨胀;ZrMo_2O_8;溶胶凝胶法;

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