Effects of La/Ce Ratio on Coloring and Crystallization of MgO-Al2O3-SiO2-TiO2-CeO2-La2O3 Glasses

• Published in: International journal of applied glass science Vol. 7; no. 3; pp. 310 - 318
• Main Authors: Wang, Hui-Juan, Li, Bo-Tao, Lin, Hui-Xing, Chen, Wei, Luo, Lan
• Format: Journal Article
• Language: English
• Published: Westerville Blackwell Publishing Ltd 01.09.2016; Wiley Subscription Services, Inc
• Subjects: Alloys; Aluminum oxide; Cerium oxides; Chemical composition; Color; Coloring; Cordierite; Crystallization; Energy dispersive X ray spectroscopy; Lanthanum; Lanthanum oxides; Network analysers; Organic chemistry; Q factors; Resonant frequencies; Scanning electron microscopy; Silicon dioxide; Spectrum analysis; Titanium dioxide; X ray photoelectron spectroscopy; X-ray diffraction; X-rays
• ISSN: 2041-1286; 2041-1294
• DOI: 10.1111/ijag.12123

1.0MgO‐1.2Al2O3‐2.8SiO2‐1.2TiO2‐(0.6‐2x)CeO2‐xLa2O3(x = 0, 0.1, 0.2, 0.3) glasses are prepared, and the La/Ce ratio‐dependent coloring and crystallization are investigated by optical transmission spectrum, the X‐ray photoelectron spectroscopy (XPS), X‐ray diffraction (XRD), scanning electron microscopy (SEM), energy‐dispersive X‐ray spectroscopy (EDS), and network analyzer. The results show that the coloring of the parent glasses varies markedly with La/Ce ratio, while the crystallization of the glasses shows no significant difference. With the increase in x, the color of the glass ranges from red‐brown to yellow and the transmittance increases markedly in visible region. The deepest color when x = 0 is related with the predominant presence of Ti4+ and Ce3+, while the lightest color when x = 0.3 is attributed to Ti4+. Perrierite, rutile, cordierite, and magnesium aluminotitanate (MAT) are found for all the glass–ceramic samples, and the relative content of these phases is almost unchanged at the same crystallization temperature. However, the chemical composition of perrierite changes greatly with La/Ce ratio. As La2O3 replaces CeO2 gradually, the dielectric constant εr maintains at about 11 and the quality factor Q×f fluctuates within a narrow range from 20,000 GHz to 22 000 GHz, while the temperature coefficient of resonant frequency τf varies between 38 and 52 ppm/°C.