4.1 Article

Crystal structure re-determination, spectroscopy, and photoluminescence of π-YBO3:Eu3+

Journal

ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE
Volume 647, Issue 22, Pages 2035-2046

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/zaac.202100229

Keywords

yttrium borate; high-pressure chemistry; crystal structure; NMR spectroscopy; photoluminescence

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The crystal structure of low-temperature orthoborate pi-YBO3 was unambiguously clarified using high-pressure/high-temperature method to prepare europium-doped pi-YBO3:Eu3+ single-crystals. The structure was refined in monoclinic space group and its luminescence properties were compared with ambient-pressure samples, confirming the accuracy of the results. The study also verified the results with undoped pi-YBO3 and samples with varying europium content prepared under ambient pressure conditions using various spectroscopic techniques.
To unambiguously clarify the long-debated crystal structure of the low-temperature orthoborate pi-YBO3, single-crystals of the europium-doped pi-YBO3:Eu3+ were prepared via a high-pressure/high-temperature route at 7.5 GPa and 1400 degrees C. The structure was solved and refined in the monoclinic space group C2/c (no. 15) in the pseudowollastonite structure type, with the lattice parameters a=11.3407(5), b=6.5501(3), c=9.5798(4) angstrom, and beta=113.08(2)degrees. This structure determination was corroborated by powder X-ray diffraction and vibrational spectroscopy. B-11 as well as Y-89 MAS NMR spectroscopy was used to verify that our results are also accurate for the undoped pi-YBO3 and samples with varying europium content prepared under ambient pressure conditions. Additionally, the luminescence properties of the Eu3+ doped pi-orthoborate were determined in comparison with these ambient-pressure samples.

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