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Small-polaron-induced infrared opacification in rutile TiO_2

机译:小珠铁诱导的金红石TiO_2中的红外透明化

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摘要

The infrared emittance of single-crystal rutile TiO_2 has been measured from room temperature to 2000 K in dry air for two polarization states. A very strong thermally induced opacification phenomenon has been found,with the sample being completely opaque in the near-infrared range several hundred K before its melting point. A large contribution from small-polaron hopping conduction can explain this anomalous degree of opacification,much stronger than similar phenomena present in other octahedrally coordinated oxide materials. These quasiparticles manifest in the high-temperature optical conductivity as a thermally activated contribution,with an activation energy close to that of DC conductivity. The small-polaron nature of this phenomenon is strengthened by the observation of broad near-infrared bands.
机译:单晶金红石TiO_2的红外线电极率已经从室温到2000K在干燥空气中测量两种偏振态。 已经发现了一种非常强烈的热诱导的渗透现象,样品在近红外范围内完全不透明,在其熔点之前几百k。 来自小极化型跳跃传导的大贡献可以解释这种异常度的透明度,比其他八面体协调氧化物材料中存在的类似现象更强大。 这些Quasiparticles在高温光导率下表现为热活化的贡献,其活化能量接近DC电导率的激活能量。 通过观察近红外线带的观察,这种现象的小极化性质是加强的。

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  • 来源
    《Journal of Applied Physics》 |2021年第7期|075105.1-075105.10|共10页
  • 作者单位

    CNRS CEMHTI UPR3079 Univ. Orleans F-45071 Orleans France Department of Physics University of the Basque Country UPV/EHU E-48940 Leioa Spain;

    Department of Physics University of the Basque Country UPV/EHU E-48940 Leioa Spain Centre for Cooperative Research on Alternative Energies (CIC energiGUNE) Basque Research and Technology Alliance (BRTA) Alava Technology Park Albert Einstein 48 01510 Vitoria-Gasteiz Spain;

    Applied Mathematics University of the Basque Country UPV/EHU E-48013 Bilbao Spain;

    CNRS CEMHTI UPR3079 Univ. Orleans F-45071 Orleans France;

    CNRS CEMHTI UPR3079 Univ. Orleans F-45071 Orleans France;

    Department of Physics University of the Basque Country UPV/EHU E-48940 Leioa Spain;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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  • 正文语种 eng
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