Bulk Crystallization in a SiO2/Al2O3/Y2O3/AlF3/B2O3/Na2O Glass: Fivefold Pseudo Symmetry due to Monoclinic Growth in a Glassy Matrix Containing Growth Barriers

Scientific Reports
Wolfgang WisniewskiChristian Rüssel

Abstract

A glass with the mol% composition 17 Y2O3·33 Al2O3·40 SiO2·2 AlF3·3 Na2O·2 CeF3·3 B2O3 is heat treated at 1000 °C for 6-24 h. This results in the surface nucleation and growth of YAG. Nucleation and growth of star-shaped alumina and later of monoclinic β-Y2Si2O7 and orthorhombic δ-Y2Si2O7 are additionally observed in the bulk. Phase identification and localization are performed by electron backscatter diffraction (EBSD) as well as TEM analysis. The monoclinic β-Y2Si2O7 observed in the bulk occurs in the form of large, crystal agglomerates which range from 50 to 120 μm in size. The individual crystals are aligned along the c-axis which is the fastest growing axis. Ten probability maxima are observed in the pole-figures illustrating the rotation of orientations around the c-axes indicating a fivefold symmetry. This symmetry is caused by multiple twinning which results in a high probability of specific orientation relationships with rotation angles of ~36°, ~108° (also referred to as the pentagon angle) and ~144° around the c-axis. All these rotation angles are close to the multiples of 36° which are required for an ideal fivefold symmetry. This is the first report of a fivefold symmetry triggered by the presence of barriers hinde...Continue Reading

References

Mar 4, 2003·Nature Materials·László GránásyVincent Ferreiro
Aug 10, 2004·Nature Materials·László GránásyJack F Douglas
Dec 18, 2007·Nature Materials·Craig L JohnsonMartin J Hÿtch
Oct 16, 2009·Nature·Dmitri V TalapinChristopher B Murray
Nov 23, 2011·Chemical Reviews·Alexander G ShtukenbergBart Kahr
Jul 16, 2013·ACS Applied Materials & Interfaces·Ashkan KeshavarziChristian Rüssel
Jun 5, 1998·Angewandte Chemie·Matthias ConradBernd Harbrecht

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Citations

Jul 8, 2020·Scientific Reports·Wolfgang WisniewskiDušan Galusek
May 6, 2021·Angewandte Chemie·Christopher M CollinsMatthew J Rosseinsky

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Methods Mentioned

BETA
electron diffraction
transmission electron microscopy
X-Ray

Software Mentioned

TSL OIM Analysis
Esprit
TSL OIM Data Collection

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