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• W2799731105 abstract "Abstract In this paper, Mg0.5Ti2(PO4)3 with the NASICON-type structure was evaluated for the first time as a possible host structure of Co2+ for obtaining an inorganic pigment with violet color. The powders were synthesized by solution combustion synthesis using glycine (G) and urea (U) as fuels and different oxidizer-to-fuel (O/F) ratios when ammonium nitrate was used as an extra-oxidant. However, X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) technics showed that the as-prepared powders were amorphous, which is due possibly by the effect of fire retardant of the diammonium hydrogen phosphate used as a source of phosphate during the synthesis. The calcination temperature for the as-prepared powders was established using Differential scanning calorimetry and Thermogravimetry (DSC/TGA), which showed crystallization temperatures less than 900 °C. Therefore, the powders were calcined at 900 °C for 3 h and the formation of the NASICON structure was confirmed using XRD and FTIR. The morphology was evaluated using Scanning electron microscopy (SEM) and the micrographs shown aggregated particles with irregular shapes. The optical properties of the inorganic pigments were studied using diffuse reflectance ultraviolet-visible-near infrared (Uv–Vis–NIR) spectroscopy, which showed that the band gap of the samples was Eg,indirect = 3.13 eV for NASICON Mg0.5Ti2(PO4)3 and Eg,indirect = 3.17 eV for NASICON Mg0.45Co0.05Ti2(PO4)3. For this reason, the band gap of the system does not depend on dopping with Co2+ for the concentration used. Thus, the mechanism of color is due to electronic transitions in DMSO-d6 orbitals with octahedral coordination for Co2+ in NASICON Mg0.45Co0.05Ti2(PO4)3. TSR (total solar reflectance) between 700 nm and 1800 nm were 95.94% for NASICON Mg0.5Ti2(PO4)3 and 81.41% for NASICON Mg0.45Co0.05Ti2(PO4)3. These results show that the pigments could be potential candidates for the application as cold pigments." @default.
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• W2799731105 date "2018-10-01" @default.
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• W2799731105 title "Synthesis by solution combustion and optical characterization of violet NASICON-type Mg0.45Co0.05Ti2(PO4)3 pigment" @default.
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• W2799731105 doi "https://doi.org/10.1016/j.dyepig.2018.04.041" @default.
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