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首页> 外文期刊>RSC Advances >Influence of defect on the electrical and optical properties of A-site non-stoichiometry Ca0.67La0.220.11Ti(1-x)CrxO3-delta perovskite
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Influence of defect on the electrical and optical properties of A-site non-stoichiometry Ca0.67La0.220.11Ti(1-x)CrxO3-delta perovskite

机译：缺损对A现场的电气和光学性质的影响Ca0.67La0.220.11ti（1-x）Crxo3-delta perovskite

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摘要

An investigation of the dielectric dispersion, electrical properties, scaling behavior and optical defects of Ca0.67La0.220.11Ti(1-x)CrxO3-delta (CLT(1-x)Crx) with x = 0 and x = 0.1 compositions is presented. The square in the formula is attributed to a vacancy in A-site. Relaxation phenomena were studied with dielectric and modulus formalism, while, the conductivity mechanism was investigated using electrical conductivity. A high permittivity of around 10(4), low dielectric loss and low electrical conductivity of around 10(-3) S cm(-1) for Ca0.67La0.22TiO3 (CLT) was observed. These values make this composition interesting for microelectric applications. A comparison between the Z '' and M '' indicated that the short-range carrier motion dominates at low temperature and becomes less localized at high temperature. The optical defects of CLT and Ca0.67La0.22Ti0.9Cr0.1O3 (CLT0.9Cr0.1) were studied by electron paramagnetic resonance (EPR) spectroscopy. The results suggest the formation of a [TiO6](9-) center, a (Ti3+-V-O) center, and dipole defect for CLT compound and Cr3+-V-O center defect for CLT0.9Cr0.1 compound. These defects are the source of the in-gap electron traps, which improve the optical properties of CLT(1-x)Crx and hence make it an interesting optical material for different applications.
机译：提出了Ca0.67La0.220.11ti（1-x）Crxo3-delta（Clt（1-x）CrxO3-Δ（Clt（1-x）Crx）的介电分散，电学，缩放行为和光学缺陷的研究呈现，具有x = 0和x = 0.1组合物。公式中的正方形归因于A现场的空位。通过电介质和模量形式学研究弛豫现象，而使用电导率研究电导率机制。观察到高约10（4），低介电损耗和低电导率为约10（-3）CM（-1）的高介电常数，用于CA0.67LA0.222TiO3（CLT）。这些值使得该组合物对微电量应用有趣。 Z''和M'之间的比较表明短程载体运动在低温下占主导地位，并且在高温下变得更少。通过电子顺磁共振（EPR）光谱研究CLT和CA0.67LA0.22TI0.9CR0.222TI0.9CR0.1O3（CLT0.9CR0.1）的光学缺陷。结果表明CLT0.9CR0.1化合物的CLT化合物和CR3 + -V-O中心缺陷的形成[TiO6]（9-）中心，（Ti3 + -V-O）中心和偶极缺陷。这些缺陷是间隙内电子疏水阀的来源，其改善了CLT（1-x）CRX的光学性质，因此使其成为不同应用的有趣的光学材料。

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  • 来源
    《RSC Advances》 |2019年第34期|共12页
  • 作者

    Hassen A. B.; Rhouma F. I. H.; Daoudi M.; Dhahri J.; Zaidi M.; Abdelmoula N.;

  • 作者单位

    Fac Sci Monastir Dept Phys Lab Matiere Condensee &

    Nanosci Monastir 5019 Tunisia;

    Ctr Rech Sci &

    Technol Energie Lab Photovolta Semicond &

    Nanostruct BP 95 Hammam Lif 2050 Tunisia;

    Ctr Natl Sci &

    Technol Nucl Lab Rech Energie &

    Matiere Dev Sci Nucl Sidi Thabet 2020 Tunisia;

    Fac Sci Monastir Dept Phys Lab Matiere Condensee &

    Nanosci Monastir 5019 Tunisia;

    Univ Monastir Lab Microoptoelect &

    Nanostruct LMON Monastir 5000 Tunisia;

    Univ Sfax Fac Sci Sfax Lab Multifunct Mat &

    Applicat LaMMA LR16ES18 BP 1171 Sfax 3000 Tunisia;

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