Growth of NdOHCO₃ nanocrystals by chemical bath and its thermal annealing treatment in air atmosphere

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• 作者：O. Portillo Moreno^a ; ^{osporti@yahoo.com.mx} ; R. Guti&eacute ; rrez P&eacute ; rez^a ; R. Palomino Merino^b ; G. Herná ; ndez T&eacute ; llez^a ; M. Chá ; vez Portillo^a ; M.N. Má ; rquez Especia^a ; E. Rubio Rosas^c ; H. Azucena Coyot&eacute ; catl^d
• 关键词：Neodymium hydroxycarbonate ; Powders morphology ; Optical absorption ; Electronic transitions
• 刊名：Optik - International Journal for Light and Electron Optics
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：130
• 期：Complete
• 页码：1045-1052
• 全文大小：1173 K
• 卷排序：130

文摘

NdOHCO3 nanocrystals were prepared by chemical bath (CB) and subsequently subjected to thermal annealing treatment (TAT) at 1000 °C in an air atmosphere, observing the NdOHCO3 → Nd2O3 transformation. Scanning Electron Microscopy (SEM), X-ray diffraction (XRD), optical absorption and photoluminescence (PL), examined morphological, structural and optical properties of these powders. Rod-like nanocrystalline structures were observed by SEM. FTIR spectra corresponding to NdOHCO3 exhibited three bands located at ∼3321 cm−1, ∼1634 cm−1 and ∼583 cm−1, corresponding to the characteristic vibration bands of CO32−anion,these bands disappear completely due to TAT. XRD patterns showed NdOHCO3 in orthorhombic phase and Nd2O3 in cubic phase, respectively. The band gap optical value was found to be 4.48 eV for NdOHCO3 and 4.54 eV for Nd2O3 respectively. PL results displayed bands associated with electronic transitions that have surface and volumetric defects, exhibiting emission bands at ∼421–485 nm (blue), ∼529–542 nm (green) and ∼622 nm (red), respectively.