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首页> 外文期刊>Key Engineering Materials >Structure and Optical Properties of SrBi_2Nb_2O_9 Thin Films Fabricated by Pulsed Laser Deposition
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Structure and Optical Properties of SrBi_2Nb_2O_9 Thin Films Fabricated by Pulsed Laser Deposition

机译：脉冲激光沉积制备SrBi_2Nb_2O_9薄膜的结构和光学性质

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摘要

SrBi_2Nb_2O_9 (SBN) thin films were prepared on fused quartz substrates at room temperature by pulsed laser deposition. The crystallization behavior and surface morphology were studied at various oxygen pressures by XRD and AFM. The results indicated that the films had polycrystalline structure with a single layered perovskite phase, and exhibited higher crystalline quality, less rough surface morphology, and larger grain size with increasing oxygen pressure. The optical transmittance of the samples was measured in the wavelength range 200-900 nm, and the dispersion relation of refractive indices and wavelength was found to follow the single electron oscillation model. The energy gap of SBN films grown at oxygen pressure of 5 Pa was estimated to be around 3.88 eV by assuming a direct transition between valence and conduction bands.
机译：通过脉冲激光沉积在室温下在熔融石英衬底上制备SrBi_2Nb_2O_9（SBN）薄膜。通过XRD和AFM研究了在不同氧气压力下的结晶行为和表面形貌。结果表明，随着氧压的增加，薄膜具有单晶钙钛矿相的多晶结构，并表现出较高的晶体质量，较低的表面形貌和较大的晶粒尺寸。在200-900nm的波长范围内测量样品的透光率，发现折射率和波长的色散关系遵循单电子振荡模型。通过假设价带和导带之间有直接过渡，在5 Pa的氧气压力下生长的SBN薄膜的能隙估计约为3.88 eV。

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