Lanthanum phosphate calcium aluminate glasses: 27Al and 31P NMR spectroscopy

Marzke, R. F.; Boucher, Susan; Wolf, George H.; Piwowarczyk, J.; Petuskey, William T.

doi:10.1016/j.jeurceramsoc.2008.03.023

Cited by 8 publications

(3 citation statements)

References 22 publications

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“…The width of the broad line is indicative of an amorphous material (based on a previous work, the average chemical shift indicates 3-4 Al neighbors per P atom). 39 This suggested that the amorphous nature, of both the as-precipitated powder and the coatings, is consistent with TEM results from the coatings. Spectrum D 00 is discussed further in relation to TRAPDOR, below.…”

Section: February 2010supporting

confidence: 71%

“…These conditions are met for aluminophosphate compounds, and allow TRAPDOR reductions to 70% and beyond. 38,39 Typical TRAPDOR signal acquisition conditions were Al r.f. pulse length 1 ms and Al power 360 W. The Al irradiation frequency was set at the peak of the 27 Al line in the treated Nextelt sample, near 10 ppm Al chemical shift.…”

Section: (4) Characterization and Testingmentioning

confidence: 99%

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Precipitation Coating of Monazite on Woven Ceramic Fibers: III—Coating without Strength Degradation Using a Phytic Acid Precursor

Fair

Hay

Boakye

et al. 2010

Journal of the American Ceramic Society

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Multiple coatings of La‐monazite (LaPO4) were applied to Nextel™ 610 and 720 oxide fibers using a heterogeneous nucleation and growth coating process with phytic acid solution precursors. The as‐processed coatings were found to be largely amorphous. Coated fibers were heat treated at 1200°C for 1–2 h, whereupon the coatings crystallized to porous LaPO4 with thin (50–100 nm) layers of AlPO4 at the fiber–coating interface. Heat‐treated fibers exhibited full strength retention, in marked contrast to fibers coated by precipitation using citric acid precursors as in a previous work. The microstructural evolution of the amorphous coatings was studied as a function of temperature. AlPO4 forms at the fiber–coating interface between 700° and 800°C, before high‐temperature outgassing of the coating as measured by TGA. NMR spectroscopy was used to study as‐precipitated powders and as‐processed coatings to gain insights into the structural nature of the materials. A possible explanation for the retention of fiber strength through the coating process is proposed and discussed in light of the experimental evidence.

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Section: February 2010supporting

confidence: 71%

Section: (4) Characterization and Testingmentioning

confidence: 99%

Precipitation Coating of Monazite on Woven Ceramic Fibers: III—Coating without Strength Degradation Using a Phytic Acid Precursor

Fair

Hay

Boakye

et al. 2010

Journal of the American Ceramic Society

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“…Figure A illustrates the 27 Al MAS NMR spectra of samples P– x Al–5Zn–1Bi. There are three peaks at ~36 ppm, ~7 ppm, and ~‐16 ppm, which correspond to tetrahedral (AlO 4 ), hexahedral (AlO 5 ), and octahedral (AlO 6 ), respectively. Aluminum octahedra are the dominant species over the other.…”

Section: Resultsmentioning

confidence: 99%

Tunable luminescence from bismuth‐doped phosphate laser glass by engineering photonic glass structure

et al. 2017

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Because of ultra-broadband near-infrared (NIR) emission bismuth-activated glasses and fibers offer a new promising platform for novel photonic devices such as new type of optical amplifiers and broadly tunable fiber lasers. Yet, challenge remains to manipulate the NIR emission behavior of bismuth (Bi) in photonic glasses for efficient Bismuth-doped fiber and fiber lasers. Here, by engineering phosphorus and aluminum's topology, broadly tunable NIR emission has been realized in Bismuth-doped phosphate laser glass. Structural and optical analyses on 27 Al magic-angle spinning nuclear magnetic resonance (MAS NMR), 31 P MAS NMR, fourier transform infrared (FTIR) and static emission spectra suggest that polymerization of glass network can be improved by proper addition of aluminum into the system, which can be evidenced by partial conversion of Q 2 to Q 3 species of phosphorus and the shift of P-O-P asymmetric stretching vibration toward lower frequency, and this turns out beneficial to Bi NIR emission. Embedding aluminum tetrahedra into phosphorus glass network can reduce the local crystal field around bismuth and therefore lead to the blueshift of Bi emission. This work presents new insights into the luminescent behavior of Bi ions in phosphate glass and it helps the design and fabrication of Bismuth-doped glasses and fibers in future.

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A comprehensive study of electrical and optical properties of phosphate oxide-based glasses doped with Er2O3

Saddeek

El-Maaref

Moustafa

et al. 2018

J Mater Sci: Mater Electron

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Lanthanum phosphate calcium aluminate glasses: 27Al and 31P NMR spectroscopy

Cited by 8 publications

References 22 publications

Precipitation Coating of Monazite on Woven Ceramic Fibers: III—Coating without Strength Degradation Using a Phytic Acid Precursor

Precipitation Coating of Monazite on Woven Ceramic Fibers: III—Coating without Strength Degradation Using a Phytic Acid Precursor

Tunable luminescence from bismuth‐doped phosphate laser glass by engineering photonic glass structure

A comprehensive study of electrical and optical properties of phosphate oxide-based glasses doped with Er2O3

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