Crystallization and spectroscopic properties investigations of Er{sup 3+} doped transparent glass ceramics containing CaF{sub 2}

Journal Article · Thu Jan 05 00:00:00 EST 2006 · Materials Research Bulletin

OSTI ID:20891611

Zhongjian, Hu ^[1]; Yuansheng, Wang ^[1]; En, Ma ^[1]; Feng, Bao ^[1]; Yunlong, Yu ^[1]; Daqin, Chen ^[1]

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1. State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Graduate School of Chinese Academy of Sciences, Chinese Academy of Sciences, Yangqiao West Road 155, Fuzhou 350002 (China)

Transparent oxyfluoride glass ceramics with composition of 45SiO{sub 2}-25Al{sub 2}O{sub 3}-5CaCO{sub 3}-10NaF-15CaF{sub 2}-0.5ErF{sub 3} (in mol%) were developed through controlled crystallization of melt-quenched glass. Non-isothermal crystallization kinetics investigation showed that the average apparent activation energy E {sub a} and Avrami exponent n are about 283 kJ/mol and 2.22, respectively, indicating the crystallization a three dimensional crystal growth process controlled by the diffusion with a decreasing nucleation rate. X-ray diffraction (XRD) analysis and transmission electron microscopy (TEM) observation revealed the precipitation of CaF{sub 2} crystallites sized about 15 nm among the glass matrix after heat-treatment at 650 deg. C for 2 h. For as-made glass, no upconversion signals were detected when excited with a 30 mW diode laser at 980 nm, while strong upconversion emissions at 545, 660 and 800 nm were obtained for transparent glass ceramic under similar excitation conditio000.

• OSTI ID: 20891611
• Journal Information: Materials Research Bulletin, Vol. 41, Issue 1; Other Information: DOI: 10.1016/j.materresbull.2005.07.016; PII: S0025-5408(05)00272-2; Copyright (c) 2005 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AFTER-HEAT
CALCIUM FLUORIDES
CERAMICS
DOPED MATERIALS
ERBIUM IONS
EXCITATION
GLASS
LASERS
MICROSTRUCTURE
OPTICAL PROPERTIES
PRECIPITATION
TRANSMISSION ELECTRON MICROSCOPY