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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.

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