Paper Title:
Crystallization of a SiO2-MgO-Al2O3-K2O-Fe2O3-F Glass
  Abstract

The phase-separation and the crystallization of SiO2-MgO-Al2O3-K2O-Fe2O3-F glass were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and electron probe of microanalyzers (EPMA). The results reveal that the varieties and the morphology of crystalline phases formed depend sensitively on the thermal treatment schedules. During the isothermal treatments, the crystalline phases of mica, mica and iron oxide (FeFeO4), and FeFeO4 as major crystals are precipitated in the glass samples heat-treated at 900, 1000 and 1050°C respectively. However, the two-step heat treatment beginning at 900°C for 1h and subsequently followed at 1050°C for 1h leads to the precipitation of mica crystal and no any signs of FeFeO4 crystalline phase is observed. Also the morphology of sample is different from that of the isothermally treated glass at 1050°C, but is similar from that of sample at 900°C. A “worm”-shaped phase-separation is observed in the sample heated at 800°C for 0.5h, which exhibits different morphology from that of droplet- or globule-shape conventionally discerned. EPMA results show that the incorporation of Fe2O3 accelerates accumulation of fluorine element, promoting the phase-separation and the crystallization of the present glass.

  Info
Periodical
Key Engineering Materials (Volumes 336-338)
Edited by
Wei Pan and Jianghong Gong
Pages
1829-1832
DOI
10.4028/www.scientific.net/KEM.336-338.1829
Citation
Q. B. Tian, Y. Wang, X. T. Yue, Y. S. Yin, S. H. Fan, "Crystallization of a SiO2-MgO-Al2O3-K2O-Fe2O3-F Glass", Key Engineering Materials, Vols. 336-338, pp. 1829-1832, 2007
Online since
April 2007
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Wei Li, Zhen Xing Yue, Fei Zhao, Jing Pei, Long Tu Li
Abstract:The plagioclase feldspar (NaxCa1-xAl2-xSi2+xO8, 0
185
Authors: Qing Bo Tian, Yue Wang, Li Ming Feng, Xiu Hui Wang, Hong Gao
Abstract:The crystallization behaviors and microstructural developments in the CaO-MgO- Al2O3-SiO2 glass with Fe2O3, ZrO2 and F as additives were...
1408
Authors: L.K.L. Falk
Abstract:This paper is focussed on the development of microstructure during liquid phase sintering and post-densification crystallisation heat...
265
Authors: Rosa Maria da Rocha, Francisco Cristóvão Lourenço de Melo
Abstract:The effect of three different sintering additive systems on densification of boron carbide powder was investigated. The sintering additives...
170
Authors: Chuan Bing Cheng, Run Hua Fan, Ke Lan Yan, Kai Sun, Min Chen, Qing Hou, Qian Qian Li
Abstract:Wave-transparent porous Si3N4 ceramics were fabricated using 9wt% multiple sintering additives of...
6