Optical Properties and Growth Mechanism of La3Ga5.5Nb0.5O14 Macroporous Ceramic

Optical properties and growth mechanism of La 3 Ga 5.5 Nb 0.5 O 14 oxides by a Pechini process were investigated. The structure and morphology were obtained after sintering at 600–800 °C. This crystallized orthorhombic La 3 Ga 5.5 Nb 0.5 O 14 can be obtained by the heat treatment process at 800 °C f...

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Bibliographic Details
Published in:Nanoscale research letters 2019-08, Vol.14 (1), p.1-7, Article 282
Main Authors: Hsiao, Yu-Jen, Nagarjuna, Yempati, Wang, Sheng-Chang
Format: Article
Language:English
Subjects:
Absorption spectra
Chemistry and Materials Science
Crystallization
Emission spectra
Excitation spectra
Heat treatment
La3Ga5.5Nb0.5O14
Lattice vacancies
Macroporous
Materials Science
Molecular Medicine
Morphology
Nano Express
Nanochemistry
Nanoscale Science and Technology
Nanotechnology
Nanotechnology and Microengineering
Optical properties
Oxides
Pechini process
Photoluminescence
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Summary:Optical properties and growth mechanism of La 3 Ga 5.5 Nb 0.5 O 14 oxides by a Pechini process were investigated. The structure and morphology were obtained after sintering at 600–800 °C. This crystallized orthorhombic La 3 Ga 5.5 Nb 0.5 O 14 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 [NbO 6 ] 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.
ISSN:1931-7573
1556-276X
DOI:10.1186/s11671-019-3104-x