ChemInform Abstract: POLYMORPHE UMWANDLUNGEN VON SELTENERDMETALLOXIDEN BEI HOHEN TEMPERATUREN

Lopato, L. M.; Shevchenko, A. V.; Kushchevskii, A. E.; Tresvyatskii, S. G.

doi:10.1002/chin.197446011

Cited by 4 publications

(6 citation statements)

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“…Beginning with Foex and Traverse, 7 a number of researchers working on pure yttria or yttria-metal oxide binary systems have reported the occurrence of a hightemperature phase transition in yttria somewhere in the range 2520-2615 K which they believed is a cubichexagonal transition. [14][15][16][17][18][19] It is unclear yet whether the thermodynamically stable phase at high-temperatures is the hexagonal phase as commonly believed or the fluorite-type cubic phase observed by Katagiri et al 9 and in this work. It is likely that the high-temperature cubic phase observed in situ in our work is a stable phase.…”

Section: Resultsmentioning

confidence: 92%

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High-temperature powder x-ray diffraction of yttria to melting point

Swamy¹,

1999

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Powder x-ray diffraction data of yttria (Y2O3) were obtained from room temperature to melting point with the thin wire resistance heating technique. A solid-state phase transition was observed at 2512 ± 25 K and melting of the high-uemperature phase at 2705 ± 25 K. Thermal expansion data for α–Y2O3 (C-type) are given for the range 298–2540 K. The unit cell parameter increases nonlinearly, especially just before the solid-state transition. The x-ray diffraction spectrum of the high-temperature phase is consistent with the fluorite-type structure (space group Fm3) with a refined unit cell parameter a = 5.3903(6) Å at 2530 K. The sample recrystallized rapidly above 2540 K, and above 2730 K, all the diffraction lines and spots disappeared from the x-ray diffraction spectrum that suggests complete melting.

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Section: Resultsmentioning

confidence: 92%

“…Another possibility is that the phase transition behavior of yttria at high temperatures is more complicated than what is generally considered with more than one phase transition as suggested by the high-temperature thermal analysis data. 15…”

Section: Resultsmentioning

confidence: 99%

High-temperature powder x-ray diffraction of yttria to melting point

Swamy¹,

1999

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“…Similarly, solid solution mixing is also a feasible strategy in Yb 3+ -doped rare-earth sesquioxides for spectral broadening. , The mixed sesquioxide hosts can yield two types of crystalline phases (cubic and orthorhombic) due to the differences in cationic radii. − When the difference in cationic radii is small (atomic number Z = 21 (Sc), Z = 39 (Y), and Z = 65 (Tb) to 71 (Lu)), , the obtained mixed rare-earth sesquioxides generally belong to the cubic phase ( Ia 3̅). , As the cationic radii between different rare-earth sesquioxides become large, the orthorhombic solid solution with the space group of Pnma would be formed . For the cubic-phase mixing of rare-earth sesquioxides, mixing RE 2 O 3 (RE = Lu, Y, Sc) hosts attracts wide research attention because there is no absorption from the visible to infrared wavebands.…”

Section: Introductionmentioning

confidence: 99%

Exploration of the Crystal Growth and Crystal-Field Effect of Yb³⁺ in Orthorhombic GdScO₃ and LaLuO₃ Crystals

Guo

Wang

et al. 2023

Crystal Growth & Design

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Yb 3+ -doped rare-earth sesquioxide crystals are a class of promising laser materials due to their high host thermal conductivity, but the insufficient emission bandwidth limits their applications in ultrafast pulsed lasers. Yb 3+ -doped orthorhombic mixed rare-earth sesquioxides show an effective spectral broadening based on the solid solution mixing strategy and indicate the development potential in ultrafast lasers. Herein, high-quality orthorhombic Yb:GdScO 3 and Yb:LaLuO 3 crystals were grown by optimizing the composition of raw oxide materials. Unlike the nearly standard stoichiometric cationic ratio in Yb:GdScO 3 , Yb:LaLuO 3 shows a La/Lu ratio below 1, suggesting the presence of anti-site Lu La defects in the host lattice. The following spectral analysis and crystal-field calculation indicate that Yb:GdScO 3 has only one kind of luminescent Yb 3+ site, while Yb:LaLuO 3 has four types of Yb 3+ centers due to the anti-site effect. Furthermore, as for the same species of Yb 3+ -doped sites, Yb:LaLuO 3 demonstrates nearly two times of inhomogeneous spectral broadening as that of Yb:GdScO 3 , which renders a more promising application value in ultrafast lasers. This study elucidates the importance of understanding the structure−activity relationship between different Yb 3+ -doped orthorhombic sesquioxides and might provide a feasible route for exploring Yb 3+ -doped ultrafast laser gain materials.

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“…The members of the SrLn 2 O 4 family crystallise in the form of calcium ferrite 2 , with the space group P nam; the crystal structure of these materials (see Fig. 1) can be viewed as a network of linked hexagons and triangles 3,4 . The most important feature of the linked hexagon (or "honeycomb") lattice is that it has the lowest coordination number, 3, in two dimensions.…”

Section: Introductionmentioning

confidence: 99%

Low-temperature magnetism in the honeycomb systems SrLn2O4 (Review Article)

Petrenko

2014

Low Temperature Physics

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Recent progress in the understanding of the complex magnetic properties of the family of rareearth strontium oxides, SrLn2O4, is reviewed. These compounds consisting of hexagons and triangles are affected by geometrical frustration and therefore exhibit its characteristic features, such as a significant reduction of magnetic ordering temperatures and complex phase diagrams in an applied field. Some of the observed features appear to be rather remarkable even in the context of the unusual behaviour associated in geometrically frustrated magnetic systems. Of particular interest is the coexistence at the lowest temperature of different magnetic structures (exhibiting either long or short-range order) characterised by different propagation vectors in materials without significant chemical or structural disorder.

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ChemInform Abstract: POLYMORPHE UMWANDLUNGEN VON SELTENERDMETALLOXIDEN BEI HOHEN TEMPERATUREN

Cited by 4 publications

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High-temperature powder x-ray diffraction of yttria to melting point

High-temperature powder x-ray diffraction of yttria to melting point

Exploration of the Crystal Growth and Crystal-Field Effect of Yb³⁺ in Orthorhombic GdScO₃ and LaLuO₃ Crystals

Low-temperature magnetism in the honeycomb systems SrLn2O4 (Review Article)

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ChemInform Abstract: POLYMORPHE UMWANDLUNGEN VON SELTENERDMETALLOXIDEN BEI HOHEN TEMPERATUREN

Cited by 4 publications

References 0 publications

High-temperature powder x-ray diffraction of yttria to melting point

High-temperature powder x-ray diffraction of yttria to melting point

Exploration of the Crystal Growth and Crystal-Field Effect of Yb3+ in Orthorhombic GdScO3 and LaLuO3 Crystals

Low-temperature magnetism in the honeycomb systems SrLn2O4 (Review Article)

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Exploration of the Crystal Growth and Crystal-Field Effect of Yb³⁺ in Orthorhombic GdScO₃ and LaLuO₃ Crystals