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

Abstract

Dedicated to Professor Josef Breu on the Occasion of his 60 th BirthdayTo unambiguously clarify the long-debated crystal structure of the low-temperature orthoborate π-YBO 3 , single-crystals of the europium-doped π-YBO 3 :Eu 3 + were prepared via a highpressure/high-temperature route at 7.5 GPa and 1400 °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) Å, and β = 113.08(2)°. This structure determination was corrobo-rated by powder X-ray diffraction and vibrational spectroscopy. 11 B as well as 89 Y MAS NMR spectroscopy was used to verify that our results are also accurate for the undoped π-YBO 3 and samples with varying europium content prepared under ambient pressure conditions. Additionally, the luminescence properties of the Eu 3 + doped π-orthoborate were determined in comparison with these ambient-pressure samples.

Recent progress in solid-state NMR of spin-½ low-γ nuclei applied to inorganic materials

“…Examples of the gains produced by the different approaches are shown in Fig. 4 for 109 Ag and 89 Y. Across the series of nuclei, sensitivity gains in the range 5-165 were observed.…”

“…Silver had two isotopes suitable for NMR spectroscopy, 107 Ag and 109 Ag, with almost equal natural abundance. However 109 Ag has a 41% greater receptivity and forms the vast majority of NMR reports on silver.…”

“…Silver had two isotopes suitable for NMR spectroscopy, 107 Ag and 109 Ag, with almost equal natural abundance. However 109 Ag has a 41% greater receptivity and forms the vast majority of NMR reports on silver. 2 Early work covered fast-ion conducting glasses (where static lines were observed due to silver ion motion) and complexes of biological significance.…”

A dual-ratiometric optical thermometry based on Sr2LaF7:Er3+ crystal-implanted pliable fibers

“…[41][42][43][44][45][46][47][48][49][50] With the introduction of Er 3+ ions into crystals Sr 2 (La 1−x Er x )F 7 , composite fibers show both the pliability of fibers and the temperature transfer properties of Er 3+ ions, which provide the possibility of optical temperature sensing in microregions. [51][52][53][54][55][56][57][58][59][60][61][62] In this work, dual-feedback optical thermometry with a single emitter based on Sr 2 (La 1−x Er x )F 7 /polyacrylonitrile composite fibers (SLF-E/PAN) is reported. SLF-E NCs are dispersed in PAN and completely wrapped by the polymer with splendid affinity.…”

“…41–50 With the introduction of Er 3+ ions into crystals Sr 2 (La 1− x Er x )F 7 , composite fibers show both the pliability of fibers and the temperature transfer properties of Er 3+ ions, which provide the possibility of optical temperature sensing in microregions. 51–62…”