Looking inside the glass

Credit: Lynn Greyling/public domain

A team of researchers from the Institute of Industrial Science at The University of Tokyo used advanced electron spectroscopy and computer simulations to better understand the internal atomic structure of aluminosilicate glass. They found complex coordination networks among aluminum atoms within phase-separated regions. This work may open the possibility for improved glasses for smart device touchscreens.

As the demand for smartphones, tablets, and solar panels increases, so too will the need for more high-quality, tough, transparent glass. One of the candidate materials for these applications is called aluminosilicate glass, which is made of aluminum, silicon, and oxygen. As with all amorphous materials, the glass does not form a simple lattice but exists more like a disordered "frozen liquid." However, intricate structures can still form between that have not yet been analyzed by scientists.

Now, a team of researchers at The University of Tokyo have used electron energy loss fine structure spectroscopy with a to reveal the local arrangement of atoms within a glass made of 50% aluminum oxide (Al2O3) and 50% silicon dioxide (SiO2). "We chose to study this system because it is known to phase separate into aluminum-rich and silicon-rich regions" first author Kun-Yen Liao says. When imaging with an , some emitted electrons undergo , which causes them to lose some of their original kinetic energy.

The amount of energy dissipated varies based on the location and type of atom or cluster of atoms in the glass sample it hit. Electron loss spectroscopy is sensitive enough to tell the difference between aluminum coordinated in tetrahedral as opposed to octahedral clusters. By fitting the profile of the electron energy loss fine spectra pixel by pixel, the abundance of the various aluminum structures was determined with nanometer precision. The team also used to interpret the data.

"Aluminosilicate glasses can be manufactured to resist high temperatures and compressive stresses. This makes them useful for a wide range of industrial and consumer applications, such as touch displays, safety , and photovoltaics," senior author Teruyasu Mizoguchi says. Because aluminosilicate is also naturally occurring, this technique can also be used for geological research. The work is published in The Journal of Physical Chemistry Letters as "Revealing Spatial Distribution of Al Coordinated Species in a Phase-separated Aluminosilicate Glass by STEM-EELS".

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More information: Kunyen Liao et al, Revealing Spatial Distribution of Al-Coordinated Species in a Phase-Separated Aluminosilicate Glass by STEM-EELS, The Journal of Physical Chemistry Letters (2020). DOI: 10.1021/acs.jpclett.0c02687
Citation: Looking inside the glass (2020, November 16) retrieved 4 December 2020 from https://phys.org/news/2020-11-glass.html
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