Effect of Ga₂O₃ on structure and properties of calcium aluminate glasses

Abstract

The effect of Ga₂O₃ on the structure and properties of calcium aluminate glasses fabricated by vacuum melting process was investigated by Raman spectrum, differential scanning calorimeter (DSC), and infrared spectrum methods. The results show that calcium aluminate glass network only consists of [AlO₄] tetrahedral units. With the gradual addition of Ga₂O₃, the quantity of [GaO₄] tetrahedral units increases. Substitution of Ga₂O₃ for Al₂O₃ results in a decrease in T _g T _x, and T _p, and an increase in the thermal stable index ΔT. Similarly, the absorption band around 3.0 μm obviously reduces and the transparency in 4.0-6.0 μm rapidly increases with increasing Ga₂O₃ content. However, the chemical stability of calcium aluminate glasses decreases if Ga₂O₃ is introduced due to the increasing of [GaO₄] units in the glass network.

Keywords

calcium aluminate glass / structure / thermal property / infrared property / chemical stability

References

[1] Shyu J J, Mai H Ch. ZrO₂-nucleated Calcium Aluminate Glass-ceramics with Mid-infrared Transparency[J]. J. Mater. Res., 2006, 21(2): 465-472.

[2] Sakamoto N, Suda K, Watanabe T, et al. Crystallization Behavior of the Eutectic Glass in the C1₂A₇-CaYAlO₄ System[J]. J. Eur. Ceram. Soc., 2008, 28(12): 2399-2404.

[3] Fondeur F, Mitchell B S. Infrared Studies of Preparation Effects in Calcium Aluminate Glasses[J]. J. Non-Cryst. Solids, 1998, 224(2): 184-190.

[4] Wang Y H, Zu C K, He K, et al. Crystallization Kinetics of Calcium Aluminate Glasses Studied by Non-isothermal Techniques[J]. J. Wuhan University of Technology-Mater. Sci. Ed., 2013, 28(5): 907-911.

[5] Kang E T, Lee S J, Hannon A C. Molecular Dynamics Simulations of Calcium Aluminate Glasses[J]. J. Non-Cryst. Solids, 2006, 352(8): 725-736.

[6] Tang B, Wu C F, Li J C, et al. Large-size Oxyfluoride Glasses Used for Vis–IR-transmitting Windows[J]. J. Non-Cryst. Solids, 2009, 355(37-42): 2006-2009.

[7] Bhatnagar A, Kumar E, Sillanp M. Fluoride Removal from Water by Adsorption-A Review[J]. Chem. Eng. J., 2011, 171(3): 811-840.

[8] Fan H Y, Hu L L, Yang K, et al. Structure and Physical Properties of Bi₂O₃-B₂O₃-Ga₂O₃ Glasses[J]. J. Non-Cryst. Solids, 2010, 356(35-36): 1814-1818.

[9] Bayya S S, Harbison B B, Sanghera J S, et al. BaO-Ga₂O₃-GeO₂ Glasses with Enhanced Properties[J]. J. Non-Cryst. Solids, 1997, 212(2-3): 198-207.

[10] Molev V I, Pozdnjakov A E, Rumjantsev V V, et al. Optical Glass for Infrared Region of Spectrum, 2003

[11] Daniel I, Mcmillan P F, Gillet P, et al. Raman Spectroscopic Study of Structural Changes in Calcium Aluminate(CaAl2O4) Glass at High Pressure and High Temperature[J]. Chem. Geol., 1996, 128(1-4): 5-15.

[12] Mcmillan P F, Piriou B. Raman Spectroscopy Study of Calcium Aluminate Glasses and Crystals[J]. J. Non-Cryst. Solids, 1983, 55(2): 221-242.

[13] Kharlamov A A, Almeida R M, Heo J. Vibrational Spectra and Structure of Heavy Metal Oxide Glasses[J]. J. Non-Cryst. Solids, 1996, 202(3): 233-240.

[14] Flower G L, Reddy M S, Baskaran G S, et al. The Structural Influence of Chromium Ions in Lead Gallium Phosphate Glasses by Means of Spectroscopic Studies[J]. Opt. Mater., 2007, 30(3): 357-363.

[15] Barr T L. Modern ESCA: The Principles and Practices of X-Ray Photoelectron Spectroscopy[M], 1993 181-191.

[16] Cao G X, Lin F Y, Hu H F, et al. A New Fluorogermanate Glass[J]. J. Non-Cryst. Solids, 2003, 326-327: 170-176.

[17] Higby P L, Aggarwal I D. Properties of Barium Gallium Germanate Glasses[J]. J. Non-Cryst. Solids, 1993, 163(3): 303-307.