Development of a β-LiAlSi2O6:Cr-based Ceramic Pigment by Proteic Sol-Gel Process Using Gelatin: Synthesis and Characterization

• Published in: Materials research (São Carlos, São Paulo, Brazil) Vol. 25; p. 1
• Main Authors: Ferraz, Ricardo Ferrari, Sousa, Jaine Ferreira, Costa, Daniel dos Santos, Oliveira, Raquel Aline Pessoa, Lima, Héstia Raissa Batista Reis
• Format: Journal Article
• Language: English
• Published: Sao Carlos Universidade Federal do Sao Carlos, Departamento de Engenharia de Materiais 01.01.2022; ABM, ABC, ABPol; Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol)
• Subjects: ceramic pigment; Ceramics; Colorimetry; Crystal lattices; Crystal structure; ENGINEERING, CHEMICAL; Gelatin; Infrared spectroscopy; MATERIALS SCIENCE, MULTIDISCIPLINARY; METALLURGY & METALLURGICAL ENGINEERING; Near infrared radiation; proteic sol-gel process; Sol-gel processes; Spectrum analysis; Spodumene; Synthesis; Trivalent chromium; X-ray diffraction; β-spodumene; β-spodumene; proteic sol-gel process; gelatin; ceramic pigment
• ISSN: 1516-1439; 1980-5373; 1980-5373
• DOI: 10.1590/1980-5373-MR-2021-0315

A novel pigment of β-LiAlSi2O6 :Cr ceramic was developed by a partial proteic sol-gel process, using gelatin as a ligand. X-ray diffraction (XRD), energy dispersive spectroscopy (EDS) and visible and near-infrared diffuse reflectance spectroscopy (vis-NIR DRS) were performed. XRD results confirmed that the crystal structure of the lattice corresponded to β-LiAlSi2O6 (or β-spodumene), and the addition Cr3+ ions by doping did not interfere in the formation of this crystalline phase. EDS confirmed the homogeneous existence of Cr3+ dopant in β-LiAlSi2O6 particles. From the vis-NIR DRS, selective absorption of visible light wavelengths was identified in the bands of 425 nm and 600 nm, resulting in the perception of a yellowish-green color when β-LiAlSi2O6 is doped with Cr3+. CIE-XYZ colorimetric coordinates were generated to characterize the resulting colors. The obtained results demonstrated the viability of β-LiAlSi2O6 :Cr synthesis by a proteic sol-gel route and its great potential for obtaining a yellowish-green ceramic pigment.