Real Competitors to Ruby : The Triel Oxonitridoborates AlB₄O₆N, Al₀.₉₇Cr₀.₀₃B₄O₆N, and Al₀.₈₃Cr₀.₁₇B₄O₆N

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Widmann, Ingo ; Kinik, Gülsüm ; Jähnig, Maximilian ; Glaum, Robert ; Schwarz, Marcus ; Wüstefeld, Christina ; Johrendt, Dirk ; Tribus, Martina ; Hejny, Clivia ; Bayarjargal, Lkhamsuren ; Dubrovinsky, Leonid ; Heymann, Gunter ; Suta, Markus ; Huppertz, Hubert:
Real Competitors to Ruby : The Triel Oxonitridoborates AlB₄O₆N, Al₀.₉₇Cr₀.₀₃B₄O₆N, and Al₀.₈₃Cr₀.₁₇B₄O₆N.
In: Advanced Functional Materials. Bd. 34 (2024) Heft 28 . - 2400054.
ISSN 1616-3028
DOI: https://doi.org/10.1002/adfm.202400054

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Abstract

AlB4O6N, Al0.97Cr0.03B4O6N, and Al0.83Cr0.17B4O6N are the first representatives of the recently established structure-family of oxonitridoborates containing Al3+. These compounds are isotypic to CrB4O6N and are synthesized in a multi-anvil press under high-pressure/high-temperature conditions of 7.0 GPa/1350 °C. Structural refinement by single-crystal X-ray diffraction shows that they crystallize in the space group P63mc (no. 186) with two formula units per cell. Detailed characterization including high-temperature X-ray powder diffraction (HT-XRD), electron probe microanalysis (EPMA), measurements of second harmonic generation (SHG), hardness, photoluminescence properties, vibrational spectroscopy, and band structure calculations reveal intriguing physicochemical properties that strongly resemble the famous material ruby.