Oriented growth of a β-quartz solid solution from a MgO–Al2O3–SiO2 glass coated by a sol–gel ZrO2 layer. Issue 29 (16th June 2016)

• Record Type: Journal Article
• Authors: Seidel, Sabrina; de Meo, Carlos Eduardo; Kracker, Michael; Wisniewski, Wolfgang; Rüssel, Christian
• Is Part Of: CrystEngComm. Volume 18:Issue 29(2016)
• Page Start: 5492
• Page End: 5501
• Publication Date: 2016-06-16
• Subjects: Crystals -- Periodicals; Crystal growth -- Periodicals; Crystallography -- Periodicals; Cristaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Cristallographie -- Périodiques; 548
• DOI: 10.1039/c5ce02356d
• Languages: English
• ISSNs: 1466-8033

Abstract

Abstract : ZrO2 induces the surface crystallization of indialite and a highly oriented layer of a β-quartz solid solution in MgO–Al2 O3 –SiO2 glass. Abstract : Glass sheets with the mol% composition 22.5MgO·22.5Al2 O3 ·55SiO2 were coated with a thin ZrO2 layer on both sides via sol–gel dip coating. The samples were heated in a two-step process to 850 °C for 1 h and to 1000 °C for another 3 or 20 h. X-ray diffraction (XRD), optical microscopy and scanning electron microscopy (SEM), including electron backscatter diffraction (EBSD), were performed to investigate the crystallization of this surface modified glass. Two types of indialite and a β-quartz solid solution (β-QSS) crystallize at, or near, the glass surface. After a growth selection during the first ca. 500 μm of growth, only a highly oriented β-QSS layer aligned with the c -axis perpendicular to the initial surface continues to grow into the bulk. The β-QSS was not observed if the glass was not coated with ZrO2 before annealing. The influence of ZrO2 on the crystallization in this system is discussed.