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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Effect of Nb doping on the phase transition and optical properties of sol-gel TiO_2 thin films
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Effect of Nb doping on the phase transition and optical properties of sol-gel TiO_2 thin films

机译：铌掺杂对溶胶-凝胶TiO_2薄膜相变和光学性能的影响

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摘要

Various content Nb-doped TiO_2 thin films were prepared by sol-gel process. XRD analysis shows that the existence of crystalline TiO_2 in anatase and rutile form depends on the Nb content in the examined samples. It is observed that Nb promotes the anatase to rutile phase transition but has a depression effect on the anatase grain growth. It is found that incorporation of about 4at.% of Nb completely transforms anatase TiO_2 to the rutile form at a calcination temperature as high as 900 °C. The mechanism is proposed. Optical analyses show that the films have an average of 60% transmission in visible region. The energy gap values using Tauc's formula have also been estimated. The band gap of rutile Ti_(1-x)Nb_xO_2 solid solutions increases with increasing x.
机译：通过溶胶-凝胶法制备了各种含量的掺Nb的TiO_2薄膜。 XRD分析表明，锐钛矿型和金红石型晶体TiO_2的存在取决于被测样品中的Nb含量。观察到Nb促进了锐钛矿向金红石相的转变，但是对锐钛矿晶粒的生长具有抑制作用。发现掺入约4原子％的Nb在高达900℃的煅烧温度下将锐钛矿TiO 2完全转化为金红石形式。提出了该机制。光学分析表明，这些膜在可见光区域的平均透射率为60％。还使用Tauc公式估算了能隙值。金红石型Ti_（1-x）Nb_xO_2固溶体的带隙随着x的增加而增加。

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