Year: 2025
Type: article
Abstract: Recently, we discovered the aluminium oxonitridoborate AlB4O6N:Cr3+, whose high-pressure/high-temperature synthesis could be optimized in the last months. This compound shows extraordinary luminescence properties, that closely resemble the famous compound ruby, whose luminescence is characterized by two narrow R emission lines close to each other. Apart from a slight blue shift, the main difference of the luminescence of the title compound is the presence of a single R line due to nearly perfect [(Al/Cr)O6] octahedra in the structure. Ruby plays a crucial role as gold standard for pressure calibration in diamond anvil cells by measuring the shift of one of these R lines with increasing pressure. However, the accuracy is limited at elevated pressure, since the two R lines broaden and eventually merge. Since the compound AlB4O6N:Cr3+ showed only one single R line up to a pressure of at least 52 GPa, it could provide improved accuracy for the calibration of diamond anvil cells. This raises the question as to how the material behaves at even higher pressures. Therefore, we performed luminescence measurements of AlB4O6N:Cr3+ up to 78(1) GPa in a diamond anvil cell and complemented our findings with single-crystal diffraction data (synchrotron) at elevated pressure to detect possible structural changes.
Source: Zeitschrift für Naturforschung B
Institutions: Universität Innsbruck, University of Bayreuth
Language: English
Subfield: Geophysics
Field: Earth and Planetary Sciences
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $2,712
Funder: Universität Innsbruck
OpenAlex ID: W4410612944