Effects of La/Ce Ratio on Coloring and Crystallization of MgO‐Al2O3‐SiO2‐TiO2‐CeO2‐La2O3 Glasses. (1st July 2015)

• Record Type: Journal Article
• Authors: Wang, Hui‐Juan; Li, Bo‐Tao; Lin, Hui‐Xing; Chen, Wei; Luo, Lan
• Is Part Of: International journal of applied glass science. Volume 7:Number 3(2016:Sep.)
• Page Start: 310
• Page End: 318
• Publication Date: 2015-07-01
• Subjects: Glass -- Periodicals; Glass manufacture -- Periodicals; 666.1
• DOI: 10.1111/ijag.12123
• Languages: English
• ISSNs: 2041-1286

Abstract

Abstract : 1.0MgO‐1.2Al2 O3 ‐2.8SiO2 ‐1.2TiO2 ‐(0.6‐2 x )CeO2 ‐ x La2 O3 ( 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 Ti 4+ and Ce 3+, while the lightest color when x = 0.3 is attributed to Ti 4+ . 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 La2 O3 replaces CeO2 gradually, the dielectric constant ε r 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 τ f varies between 38 and 52 ppm/°C.