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Published on: August 15, 2015
Optical Properties and Growth Mechanism of La3Ga5.5Nb0.5O14 Macroporous Ceramic
Yu-Jen Hsiao1, Yempati Nagarjuna2, Sheng-Chang Wang2
1Department of Mechanical Engineering, Southern Taiwan University of Science and Technology, Tainan, 710, Taiwan. yujenhsiao.tw@gmail.com.
Abstract:
Optical properties and growth mechanism of La3Ga5.5Nb0.5O14 oxides by a Pechini process were investigated. The structure and morphology were obtained after sintering at 600-800 °C. This crystallized orthorhombic La3Ga5.5Nb0.5O14 can be obtained by the heat treatment process at 800 °C from XRD. A proposed schematic growth mechanism of La3Ga5.5Nb0.5O14 macroporous based on the details provided is shown. The photo-luminescence spectra shown that under 327 nm excitation spectra, a broad and blue emission peak is observed at 475 nm at 77 K and this spectrum is originated from the [NbO6]7- octahedra group. The optical absorption spectra of the 800 °C sample exhibited a well-crystalline and very low oxygen vacancy, which corresponded to the band gap energies of 3.95 eV.
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