Phase diagram of the system CaF2−YF3

Seiranian, K.B.; Федоров, П. П.; Garashina, L.S.; Molev, Gregory; Karelin, V. V.; Соболев, Б. П.

doi:10.1016/0022-0248(74)90201-2

Cited by 25 publications

(12 citation statements)

References 11 publications

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“…The sintering aids of the CaF 2 -YF 3 system are interesting due to the absence of oxygen and the low liquidus temperatures. The eutectic points in the CaF 2 -YF 3 system occur at 60 and 91 mol% CaF 2 at 1120º and 1106ºC, respectively (Seiranian et al, 1974). The studies on the thermodynamics taking place during sintering of AlN have been reported for AlN samples processed in organic media, therefore involving a residual amount of alumina at the surface of the AlN particles and the sintering additives (Buhr et al, 1991;Gross et al, 1998;Hagen et al, 2002;Hundere & Einarsrud, 1996;Medraj et al, 2005;Virkar et al, 1999).…”

Section: Thermodynamic Studies On the Aln Sintering Powders Treated Wmentioning

confidence: 99%

“…The reducing condition in the graphite furnace as discussed further below will contribute to the thermodynamic instability of the phosphate species. The sintering additives YF 3 and CaF 2 used melt between 1000 and 1200°C (Seiranian et al, 1974). Therefore, the reaction of the fluorides with alumina present in the AlN during sintering is important.…”

Section: Thermodynamic Studies On the Aln Sintering Powders Treated Wmentioning

confidence: 99%

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Last Advances in Aqueous Processing of Aluminium Nitride (AlN) - A Review

Olhero¹,

Alves²,

Ferreira³

2011

Advances in Ceramics - Synthesis and Characterization, Processing and Specific Applications

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Section: Thermodynamic Studies On the Aln Sintering Powders Treated Wmentioning

confidence: 99%

Section: Thermodynamic Studies On the Aln Sintering Powders Treated Wmentioning

confidence: 99%

Last Advances in Aqueous Processing of Aluminium Nitride (AlN) - A Review

Olhero¹,

Alves²,

Ferreira³

2011

Advances in Ceramics - Synthesis and Characterization, Processing and Specific Applications

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“…Solid solution of yttrium fluoride in calcium fluoride is a classic example of heterovalent isomorphism [5]. Its study was initially discussed by Vogt in treatises on yttrofluorite [6], and has continued for more than a hundred years [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24] (for a more detailed history of this study, please see [18]): the said CaF 2 -YF 3 system has become a model for describing the interaction of calcium fluoride with the rare earth fluorides from yttrium group of elements (see Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

Synthesis of CaF2–YF3 nanopowders by coprecipitation from aqueos solutions

Федоров¹,

Mayakova²,

Kuznetsov³

et al. 2017

Nanosystems: Phys. Chem. Math.

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Study of the CaF 2 -YF 3 system by co-precipitation from aqueous nitrate solutions revealed the formation of Ca 1−x YxF 2+x solid solution precipitate containing up to 20 mol. % yttrium fluoride (x ≤ 0.2). A higher yttrium to calcium ratio in the starting solutions caused additional precipitation of orthorhombic β-YF 3 nanophase elongated along the b axis. Cubic (H 3 O)Y 3 F 10 phase was also formed (SSG Fm3m, a = 11.60Å, KY 3 F 10 structural type).

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“…Then, the Ca 1Àx Y x F 2+x belongs to the (CaF 2 ) 1Àx -(YF 3 ) x solid solution where uorite-type crystals exist when x is comprised between 0 to 0.35. 41 Lastly, the NaYF 4 crystal consists of two polymorphs: the cubic uorite phase, labeled a-NaYF 4 and the hexagonal one, labeled b-NaYF 4 .…”

Section: Structural Investigationmentioning

confidence: 99%

White light and multicolor emission tuning in triply doped Yb³⁺/Tm³⁺/Er³⁺ novel fluoro-phosphate transparent glass-ceramics

et al. 2014

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, Er 3+ and Tm 3+ doped fluoro-phosphate glasses belonging to the system NaPO 3 -YF 3 -BaF 2 -CaF 2 and containing up to 10 wt% of rare-earth ion fluorides were prepared and characterized by differential scanning calorimetry, absorption spectroscopy and up-conversion emission spectroscopy under excitation with a 975 nm laser diode. Transparent and homogeneous glass-ceramics have been reproducibly obtained with a view to manage the red, green and blue emission bands and generate white light. X-ray diffraction as well as electron microscopy techniques have confirmed the formation of fluorite-type cubic nanocrystals at the beginning of the crystallization process while complex nanocrystalline phases are formed after a longer heat-treatment. The prepared glass-ceramics exhibit high optical transparency even after 170 h of thermal treatment. An improvement of up-conversion emission intensity -from 10 to 160 times larger -was measured in the glass-ceramics when compared to the parent glass, suggesting an important incorporation of the rare-earth ions into the crystalline phase(s). The involved mechanisms and lifetime were described in detail as a function of heat-treatment time. Finally, a large range of designable color rendering (from orange to turquoise through white) can be observed in these materials by controlling the laser excitation power and the crystallization rate.

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Phase diagram of the system CaF2−YF3

Cited by 25 publications

References 11 publications

Last Advances in Aqueous Processing of Aluminium Nitride (AlN) - A Review

Last Advances in Aqueous Processing of Aluminium Nitride (AlN) - A Review

Synthesis of CaF2–YF3 nanopowders by coprecipitation from aqueos solutions

White light and multicolor emission tuning in triply doped Yb³⁺/Tm³⁺/Er³⁺ novel fluoro-phosphate transparent glass-ceramics

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Phase diagram of the system CaF2−YF3

Cited by 25 publications

References 11 publications

Last Advances in Aqueous Processing of Aluminium Nitride (AlN) - A Review

Last Advances in Aqueous Processing of Aluminium Nitride (AlN) - A Review

Synthesis of CaF2–YF3 nanopowders by coprecipitation from aqueos solutions

White light and multicolor emission tuning in triply doped Yb3+/Tm3+/Er3+ novel fluoro-phosphate transparent glass-ceramics

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Product

Resources

About

White light and multicolor emission tuning in triply doped Yb³⁺/Tm³⁺/Er³⁺ novel fluoro-phosphate transparent glass-ceramics