首页> 外文OA文献 >Structural refinement and photoluminescence properties of irregular cube-like (Ca1−xCux)TiO3 microcrystals synthesized by the microwave–hydrothermal method
【2h】

Structural refinement and photoluminescence properties of irregular cube-like (Ca1−xCux)TiO3 microcrystals synthesized by the microwave–hydrothermal method

机译:微波 - 水热法合成不规则立方体(Ca1-xCux)TiO3微晶的结构细化和光致发光特性

摘要

In this paper, calcium copper titanate (Ca1−xCux)TiO3 microcrystals with (x = 0, 0.01 and 0.02) were synthesized by the microwave–hydrothermal method at 140 °C for 30 min. These crystals were analyzed by X-ray diffraction (XRD), Rietveld refinement, X-ray absorption near-edge structure spectroscopy (XANES), micro-Raman spectroscopy, field emission scanning electron microscopy (FE-SEM). Its optical properties were investigated by ultraviolet–visible (UV–vis) absorption and photoluminescence (PL) measurements. XRD patterns, Rietveld refinement and micro-Raman spectroscopy indicated that these crystals present a perovskite-type orthorhombic structure. The Rietveld refinement data, micro-Raman and XANES spectra suggested that the substitution of Ca by Cu in A-site promoted a displacement of Ti atoms to off-center symmetric, which leads distortions on the cuboctahedral [CaO12] clusters neighboring and consequently promotes a strain into the CaTiO3 lattice. FE-SEM images showed that these cube-like microcrystals have an irregular shape due to Ostwald-ripening and self-assembly of plates and cubes in growth process. The defects and distortions into lattice at medium- and short-range on the [CaO12]/[TiO6] clusters promotes the structural order–disorder responsible by the intense PL properties of these microcrystals. The microcrystals are promising candidates for future applications in optical devices.
机译:在本文中,通过微波-水热法于140°C加热30分钟,合成了(x = 0、0.01和0.02)的钛酸钙铜(Ca1-xCux)TiO3微晶。通过X射线衍射(XRD),Rietveld精制,X射线吸收近边缘结构光谱(XANES),显微拉曼光谱,场发射扫描电子显微镜(FE-SEM)分析这些晶体。通过紫外-可见(UV-vis)吸收和光致发光(PL)测量研究了其光学特性。 XRD图谱,Rietveld精细化和显微拉曼光谱表明,这些晶体呈现钙钛矿型正交晶结构。 Rietveld精炼数据,显微拉曼光谱和XANES光谱表明,A位置的Cu取代Ca促进了Ti原子向偏心对称的位移,从而导致邻近的八面体[CaO12]团簇发生畸变,从而促进了应变进入CaTiO3晶格。 FE-SEM图像显示,这些立方体状的微晶由于在生长过程中奥斯特瓦尔德(Ostwald)熟化和板和立方体的自组装而具有不规则形状。 [CaO12] / [TiO6]簇上中短程的缺陷和晶格畸变,促进了这些微晶具有强烈的PL特性,导致结构有序无序。微晶是光学器件未来应用的有希望的候选者。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号