Inorganic Green Pigments Based on LaSr<sub>2</sub>AlO<sub>5</sub>
La<sub>1.03</sub>Sr<sub>1.97</sub>Al<sub>0.97</sub><i>M</i><sub>0.03</sub>O<sub>5</sub> (<i>M</i> = Fe, Co, Ni, and Cu) samples were synthesized using a citrate sol–gel method to develop a novel environmentally frien...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-11-01
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| Series: | Ceramics |
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| Online Access: | https://www.mdpi.com/2571-6131/6/4/138 |
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| author | Kazuki Yamaguchi Akari Takemura Saki Furumoto Ryohei Oka Toshiyuki Masui |
| author_facet | Kazuki Yamaguchi Akari Takemura Saki Furumoto Ryohei Oka Toshiyuki Masui |
| author_sort | Kazuki Yamaguchi |
| collection | DOAJ |
| description | La<sub>1.03</sub>Sr<sub>1.97</sub>Al<sub>0.97</sub><i>M</i><sub>0.03</sub>O<sub>5</sub> (<i>M</i> = Fe, Co, Ni, and Cu) samples were synthesized using a citrate sol–gel method to develop a novel environmentally friendly inorganic green pigment. Among them, the Co-doped sample exhibited a vivid yellow, but not green. Then, (La<sub>0.94</sub>Ca<sub>0.06</sub>)Sr<sub>2</sub>(Al<sub>0.97</sub>Mn<sub>0.03</sub>)O<sub>5</sub> was synthesized and characterized with respect to the crystal structure, optical properties, and color. The sample was obtained in a single-phase form and the lattice volume was smaller than that of the (La<sub>0.94</sub>Ca<sub>0.06</sub>)Sr<sub>2</sub>AlO<sub>5</sub> sample, indicating that Mn ions in the lattice of the sample were pentavalent. The sample exhibited optical absorption at a wavelength below 400 nm and around 650 nm. These absorptions were attributed to the ligand, the metal charge transfer (LMCT), and d-d transitions of Mn<sup>5+</sup>. Because the green light corresponding to 500 to 560 nm was reflected strongly, the synthesized sample exhibited a bright green color. (La<sub>0.94</sub>Ca<sub>0.06</sub>)Sr<sub>2</sub>(Al<sub>0.97</sub>Mn<sub>0.03</sub>)O<sub>5</sub> showed high brightness (<i>L</i>* = 50.1) and greenness (<i>a</i>* = −20.8), and these values were as high as those of the conventional green pigments such as chromium oxide and cobalt green. Therefore, the (La<sub>0.94</sub>Ca<sub>0.06</sub>)Sr<sub>2</sub>(Al<sub>0.97</sub>Mn<sub>0.03</sub>)O<sub>5</sub> pigment is a potential candidate for a novel environmentally friendly inorganic green pigment. |
| first_indexed | 2024-03-08T20:55:09Z |
| format | Article |
| id | doaj.art-dc2efb6c9feb424aa121fb617c09bc1d |
| institution | Directory Open Access Journal |
| issn | 2571-6131 |
| language | English |
| last_indexed | 2024-03-08T20:55:09Z |
| publishDate | 2023-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Ceramics |
| spelling | doaj.art-dc2efb6c9feb424aa121fb617c09bc1d2023-12-22T13:59:53ZengMDPI AGCeramics2571-61312023-11-01642269228110.3390/ceramics6040138Inorganic Green Pigments Based on LaSr<sub>2</sub>AlO<sub>5</sub>Kazuki Yamaguchi0Akari Takemura1Saki Furumoto2Ryohei Oka3Toshiyuki Masui4Department of Chemistry and Biotechnology, Faculty of Engineering, and Center for Research on Green Sustainable Chemistry, Tottori University, 4-101, Koyama-cho Minami, Tottori 680-8552, JapanDepartment of Chemistry and Biotechnology, Faculty of Engineering, and Center for Research on Green Sustainable Chemistry, Tottori University, 4-101, Koyama-cho Minami, Tottori 680-8552, JapanDepartment of Chemistry and Biotechnology, Faculty of Engineering, and Center for Research on Green Sustainable Chemistry, Tottori University, 4-101, Koyama-cho Minami, Tottori 680-8552, JapanField of Advanced Ceramics, Department of Life Science and Applied Chemistry, Nagoya Institute of Technology, Gokiso, Showa, Nagoya 466-8555, JapanDepartment of Chemistry and Biotechnology, Faculty of Engineering, and Center for Research on Green Sustainable Chemistry, Tottori University, 4-101, Koyama-cho Minami, Tottori 680-8552, JapanLa<sub>1.03</sub>Sr<sub>1.97</sub>Al<sub>0.97</sub><i>M</i><sub>0.03</sub>O<sub>5</sub> (<i>M</i> = Fe, Co, Ni, and Cu) samples were synthesized using a citrate sol–gel method to develop a novel environmentally friendly inorganic green pigment. Among them, the Co-doped sample exhibited a vivid yellow, but not green. Then, (La<sub>0.94</sub>Ca<sub>0.06</sub>)Sr<sub>2</sub>(Al<sub>0.97</sub>Mn<sub>0.03</sub>)O<sub>5</sub> was synthesized and characterized with respect to the crystal structure, optical properties, and color. The sample was obtained in a single-phase form and the lattice volume was smaller than that of the (La<sub>0.94</sub>Ca<sub>0.06</sub>)Sr<sub>2</sub>AlO<sub>5</sub> sample, indicating that Mn ions in the lattice of the sample were pentavalent. The sample exhibited optical absorption at a wavelength below 400 nm and around 650 nm. These absorptions were attributed to the ligand, the metal charge transfer (LMCT), and d-d transitions of Mn<sup>5+</sup>. Because the green light corresponding to 500 to 560 nm was reflected strongly, the synthesized sample exhibited a bright green color. (La<sub>0.94</sub>Ca<sub>0.06</sub>)Sr<sub>2</sub>(Al<sub>0.97</sub>Mn<sub>0.03</sub>)O<sub>5</sub> showed high brightness (<i>L</i>* = 50.1) and greenness (<i>a</i>* = −20.8), and these values were as high as those of the conventional green pigments such as chromium oxide and cobalt green. Therefore, the (La<sub>0.94</sub>Ca<sub>0.06</sub>)Sr<sub>2</sub>(Al<sub>0.97</sub>Mn<sub>0.03</sub>)O<sub>5</sub> pigment is a potential candidate for a novel environmentally friendly inorganic green pigment.https://www.mdpi.com/2571-6131/6/4/138green pigmentenvironmentally friendlyMn<sup>5+</sup> ionyellow pigmentCo<sup>2+</sup> ionlanthanum strontium aluminate |
| spellingShingle | Kazuki Yamaguchi Akari Takemura Saki Furumoto Ryohei Oka Toshiyuki Masui Inorganic Green Pigments Based on LaSr<sub>2</sub>AlO<sub>5</sub> Ceramics green pigment environmentally friendly Mn<sup>5+</sup> ion yellow pigment Co<sup>2+</sup> ion lanthanum strontium aluminate |
| title | Inorganic Green Pigments Based on LaSr<sub>2</sub>AlO<sub>5</sub> |
| title_full | Inorganic Green Pigments Based on LaSr<sub>2</sub>AlO<sub>5</sub> |
| title_fullStr | Inorganic Green Pigments Based on LaSr<sub>2</sub>AlO<sub>5</sub> |
| title_full_unstemmed | Inorganic Green Pigments Based on LaSr<sub>2</sub>AlO<sub>5</sub> |
| title_short | Inorganic Green Pigments Based on LaSr<sub>2</sub>AlO<sub>5</sub> |
| title_sort | inorganic green pigments based on lasr sub 2 sub alo sub 5 sub |
| topic | green pigment environmentally friendly Mn<sup>5+</sup> ion yellow pigment Co<sup>2+</sup> ion lanthanum strontium aluminate |
| url | https://www.mdpi.com/2571-6131/6/4/138 |
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