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Synthesis and characterization of Fe3+ doped Co0.5Mg0.5Al2O4 inorganic pigments with high near-infrared reflectance
- Source :
- Powder Technology. 292:7-13
- Publication Year :
- 2016
- Publisher :
- Elsevier BV, 2016.
-
Abstract
- In this work, a series of near-infrared reflective inorganic pigments with a general formula Co0.5Mg0.5Al2 − xFexO4 (x = 0.0, 0.2, 0.4, 0.6, 0.8, 1.0) were successfully prepared by Pechini-type sol–gel method. Comprehensive analyses were carried out to characterize the developed pigment powders including thermogravimetry and differential scanning calorimetry, X-ray diffraction, field emission scanning electron microscopy, ultraviolet–visible near infrared diffuse reflectance spectroscopy, and CIE-L⁎a⁎b⁎ 1976 color scales. The results demonstrated that the single-phase Co0.5Mg0.5Al2 − xFexO4 was synthesized at an optimum temperature of 900 °C. The resulting calcined powders have a well-developed cubic spinel structure. The substitution of Fe3 + for Al3 + in Co0.5Mg0.5Al2 − xFexO4 changes the color from blue to black and the band gap shifts from 4.40 eV to 3.50 eV. And Fe doped pigments possess high near-infrared solar reflectance (> 43%) in the range of 780–2500 nm. Therefore, these Co0.5Mg0.5Al2 − xFexO4 powders have great potential in serving as cool pigments for building coatings.
- Subjects :
- Materials science
Diffuse reflectance infrared fourier transform
Band gap
General Chemical Engineering
Doping
Spinel
Near-infrared spectroscopy
Analytical chemistry
Mineralogy
02 engineering and technology
engineering.material
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
0104 chemical sciences
law.invention
Thermogravimetry
Differential scanning calorimetry
law
engineering
Calcination
0210 nano-technology
Subjects
Details
- ISSN :
- 00325910
- Volume :
- 292
- Database :
- OpenAIRE
- Journal :
- Powder Technology
- Accession number :
- edsair.doi...........bf20811c8ec439dec49ba0b758a1a6a2