X-ray Diffraction and SEM Studies on the Effect of Temperature on the Formation of Main Phase Sr2MgSi2O7 Using a Wet and Dry Method for its Preparation

Document Type: Research Note

Authors

1 Department of Polymer Engineering, Amirkabir University of Technology, P.O. Box 15875-4413, Tehran, I.R. IRAN

2 Faculty of Biomedical Engineering, Amirkabir University of Technology, Tehran, I.R. IRAN

3 Department of Chemical Engineering, Iran University of Science and Technology, Tehran, I.R. IRAN

Abstract

A pure Silicate host namely Sr2MgSi2O7 as a support for a long-lasting afterglow when dopped with rare-earth elements was sought after. To this end the process of obtaining firing temperatures of the above mentioned phase in normal condition was carried out using suggested wet and dry methods. The degree of purity obtained in these preparatory methods as well as the different firing temperatures were studied by the aid of SEM and XRD techniques. It was found that for the wet method there exists a temperature beyond which the amount of impurity remained constant. There also existed a temperature at which both the wet and dry methods gave the same amount of impurity. Beyond this temperature the wet method would be preferred.

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[1] Thomas, L., Barry and et al., US patent, No. 3, 544, 482 (1970).

[2] Ranajit, US patent, No. 3, 676, 361 (1979).

[3] Hase, et al, US patent, No. 5, 950, 915 (1999).

[4] Lin, Y., Tang , Z., Zhang, Z., et al., Materials Science and Engineering B, 86, 79 (2001).

[5] Sabbagh  Alvani A. A., Moztarzadeh  F., and Sarabi A. A., European Powder Diffraction Conference IX, Prague, Czech Republic, Sep. (2004).

[6] Blasse, G. and Wanamaker, W. L., et al., Fluorescence of Eu+2 activated silicates, Philips Res. Repts, 23, 189(1968).

[7] Yamazaki, K., Nakabayashi, H., Kotera, Y. and Ueno, A., Fluorescence of Eu+2 activated binary alkaline earth silicates, J. Electrochem. Soc., 133, 657 (1986).

[8] Sabbagh Alvani A. A., Moztarzadeh F., Sarabi A. A., Effects of dopant concentrations on phosphore-scence properties of Eu/Dy doped Sr3MgSi2O8, J. Luminescence, 114, 131 (2005).

[9] Sabbagh Alvani, A. A., Moztarzadeh, F., Sarabi, A. A., Preparation and properties of long afterglow in alkaline earth silicate phosphors co-doped by Eu2O3 and Dy2O3, J. Luminescence, 115, 147 (2005).