Radiolysis of LaF3 crystals with rare-earth impurities

Раджабов, Е. А.

doi:10.1134/s0030400x16100210

Cited by 3 publications

(1 citation statement)

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“…In laser materials, the effect of doping components and admixtures may be even more striking 18 . For instance, it was demonstrated that the alloying of LaF 3 with different rare earth elements caused a shift of absorption bands: for Y, Ce, Gd, Tb, Ho, Er, and Lu, the absorption bands lay in the range 520–550 nm, while for Nd, Sm, Yb, and Tm, considerable absorption was observed at around 200 nm with low‐intensity absorption bands in the visual and UV range and no bands at around 330 nm 19,20 . The doping component concentration (atomic fraction level of ca 0.01 at%) and its inhomogeneous distribution in LaF 3 matrix, formed during crystal growth, affect both absorption band position and intensity, contributing to laser transparency.…”

Section: Introductionmentioning

confidence: 99%

A study of matrix and admixture elements in fluorine‐rich ionic conductors by pulsed glow discharge mass spectrometry

Chuchina

Gubal

Lyalkin

et al. 2020

Rapid Comm Mass Spectrometry

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Rationale: Dopants in ionic conductors play a crucial role in achieving the required electrochemical properties. A slight variation in their concentration considerably affects the conductivity of crystals and their applicability as ionic conductors and laser materials. To ensure the growth of high-quality fluoride crystals, adequate approaches for the quantification of matrix and admixture/dopant components are required. Methods: A panel of SrF 2 -and GdF 3 -doped LaF 3 single crystals was investigated.The electrical conductivity of the crystals was measured using impedance spectroscopy in the frequency range 100 Hz-1 MHz to control for crystal quality.Pulsed glow discharge mass spectrometry (GDMS) was used to simultaneously quantify fluorine, strontium, lanthanum, and gadolinium in the crystals. X-ray fluorescence, scanning electron microscopy-energy dispersive X-ray spectroscopy, and arc optical emission spectrometry were used for validation.Results: Quasiperiodic intensity drifts under sputtering of the ionic conductors were observed and attributed to F − redistribution on the sample surface, affecting surface conductivity and sputtering rate. Several sample preparation protocols were tested to address that effect. Full coating of the sample with a layer of silver several micrometers thick provided stable and effective sputtering. The parameters for the GDMS determination of F, Sr, La, and Gd were optimized. The elements' distribution was studied in different parts of the crystals. Conclusions:An analytical approach to the direct multi-element analysis of fluoridecontaining ionic conductors using pulsed GDMS with La 1−x−y Sr x Gd y F 3−x as an example was designed and tested. Instability effects of ionic conductivity were explained and coped with, providing effective and stable sputtering.

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Section: Introductionmentioning

confidence: 99%

A study of matrix and admixture elements in fluorine‐rich ionic conductors by pulsed glow discharge mass spectrometry

Chuchina

Gubal

Lyalkin

et al. 2020

Rapid Comm Mass Spectrometry

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Efficient multicolor tunability of ultrasmall ternary-doped LaF₃ nanoparticles: energy conversion and magnetic behavior

Shrivastava

Khan

Vargas

et al. 2017

Phys. Chem. Chem. Phys.

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Luminescence-tunable multicolored LaF:xCe,xGd,yEu (x = 5; y = 1, 5, 10, and 15 mol%) nanoparticles have been synthesized via a low cost polyol method. Powder X-ray diffraction and high-resolution transmission electron microscopy studies confirm the hexagonal phase of the LaF:xCe,xGd,yEu nanophosphors with average sizes (oval shape) ranging from 5 to 7 nm. Energy-dispersive X-ray spectroscopy analyses show the uniform distribution of Ce, Gd, and Eu dopants in the LaF host matrix. The photoluminescence spectra and electron paramagnetic resonance measurements guarantee the presence of Eu, corroborated through DC susceptibility measurements of the samples displaying paramagnetic behavior at 300 K, whereas weak ferromagnetic ordering is shown at 2 K. The non-radiative energy transfer processes from the 4f(F) → 5d state (Ce) to the intraconfigurational 4f excited levels of rare earth ions and simultaneous emissions in the visible region from the 4f5d (Eu) and D (Eu) emitting levels, leading to overlapped broad and narrow emission bands, have been proclaimed. The energy transfer mechanism proposes involvement of the Gd ion sub-lattice as the bridge and finally trapping by Eu, upon excitation of the Ce ion. The calculation of experimental intensity parameters (Ω) has been discussed and the highest emission quantum efficiency (η = 85%) of the Eu ion for the y = 10 mol% sample is reported. The advantageous existence of the Eu/Eu ratio along with variously doped nanomaterials described in this work, results in tunable emission color in the blue-white-red regions, highlighting the potential application of the samples in solid-state lighting devices, scintillation devices, and multiplex detection.

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Divalent rare-earth ions in LaF3 crystals

Раджабов

Samborsky

2017

Bull. Russ. Acad. Sci. Phys.

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Radiolysis of LaF3 crystals with rare-earth impurities

Cited by 3 publications

References 8 publications

A study of matrix and admixture elements in fluorine‐rich ionic conductors by pulsed glow discharge mass spectrometry

A study of matrix and admixture elements in fluorine‐rich ionic conductors by pulsed glow discharge mass spectrometry

Efficient multicolor tunability of ultrasmall ternary-doped LaF₃ nanoparticles: energy conversion and magnetic behavior

Divalent rare-earth ions in LaF3 crystals

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Radiolysis of LaF3 crystals with rare-earth impurities

Cited by 3 publications

References 8 publications

A study of matrix and admixture elements in fluorine‐rich ionic conductors by pulsed glow discharge mass spectrometry

A study of matrix and admixture elements in fluorine‐rich ionic conductors by pulsed glow discharge mass spectrometry

Efficient multicolor tunability of ultrasmall ternary-doped LaF3 nanoparticles: energy conversion and magnetic behavior

Divalent rare-earth ions in LaF3 crystals

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Efficient multicolor tunability of ultrasmall ternary-doped LaF₃ nanoparticles: energy conversion and magnetic behavior