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Issue 66, 2019
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Improvement of near-infrared (NIR) reflectivity and black color tone by doping Zn2+ into the Ca2Mn0.85Ti0.15O4 structure

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Abstract

Inorganic black pigments with thermal barrier characteristics, Ca2Mn0.85−xTi0.15ZnxO4−x (0 ≤ x ≤ 0.10), were synthesized using a conventional solid-state reaction method in order to improve the blackness without decreasing the near-infrared (NIR) reflectance of a Ca2Mn0.85Ti0.15O4 pigment, which was previously reported by our group. The composition was optimized to provide both high blackness and NIR reflection characteristics. As a result, the NIR solar reflectance value (RNIR) of Ca2Mn0.77Ti0.15Zn0.08O3.92 (RNIR = 74.6%) became larger than that of Ca2Mn0.85Ti0.15O4 (RNIR = 71.7%), and the black color tone of the former (L* = 23.2, a* = +2.81, b* = +0.83, C = 2.93) was improved in comparison with that of the latter (L* = 24.4, a* = +4.30, b* = +2.72, C = 5.09). This improvement is caused by the introduction of strain into the [MnO6] octahedra and a decrease in the manganese ion concentration. The RNIR value of the Ca2Mn0.77Ti0.15Zn0.08O3.92 pigment was also larger than those of the commercially available pigments (RNIR < 53.0%). Therefore, Ca2Mn0.77Ti0.15Zn0.08O3.92 has potential to be an inorganic black pigment for thermal shielding.

Graphical abstract: Improvement of near-infrared (NIR) reflectivity and black color tone by doping Zn2+ into the Ca2Mn0.85Ti0.15O4 structure

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Article information


Submitted
27 Sep 2019
Accepted
20 Nov 2019
First published
28 Nov 2019

This article is Open Access

RSC Adv., 2019,9, 38822-38827
Article type
Paper

Improvement of near-infrared (NIR) reflectivity and black color tone by doping Zn2+ into the Ca2Mn0.85Ti0.15O4 structure

R. Oka, S. Iwasaki and T. Masui, RSC Adv., 2019, 9, 38822
DOI: 10.1039/C9RA07849E

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