Analysis of nanostructure and nanochemistry by ASAXS: Accessing phase composition of oxyfluoride glass ceramics doped with Er{sup 3+}/Yb{sup 3+}

Journal Article · Sat May 01 00:00:00 EDT 2010 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PHYSREVB.81.184207· OSTI ID:21366820

Haas, Sylvio; Hoell, Armin; Wurth, Roman; Ruessel, Christian; Boesecke, Peter; Vainio, Ulla ^[1]

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1. Institute of Applied Materials, Helmholtz-Zentrum Berlin fuer Materialien und Energie, Albert-Einstein-Strasse 15, D-12489 Berlin (Germany)

Here, we describe the analysis of the nanostructure and average chemical compositions of each phase present in an oxyfluoride glass ceramic, which is composed of fluoride nanocrystals and an oxide glass matrix. The overall composition of the oxyfluoride glass ceramic as prepared is 21.1%SiO{sub 2} 6.5%B{sub 2}O{sub 3} 7.0%Al{sub 2}O{sub 3} 21.0%PbF{sub 2} 14.3%CdF{sub 2} 11.0%YbF{sub 3} 0.5%ErF{sub 3} 11.0%PbO 7.6%CdO(mole %). Nanocrystals begin to grow at temperatures above the glass transformation temperature at 678 K as observed by x-ray diffraction. We report results from anomalous small-angle x-ray scattering taken at energies of x-ray absorption edges of Er, Yb, Pb, and Cd. By nonlinear regression of the scattering curves obtained from different edges simultaneously, the nanocrystals were found to be describable as polydisperse spheroids. The length of the smaller axis was found to be 6.4+-1.4 nm while the larger axis was found to be 17.7+-3.9 nm. By analyzing the scattering contrast as a function of the x-ray energy we found cadmium only in the glass matrix.

• OSTI ID: 21366820
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Vol. 81, Issue 18; Other Information: DOI: 10.1103/PhysRevB.81.184207; (c) 2010 The American Physical Society; ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
77 NANOSCIENCE AND NANOTECHNOLOGY
ABSORPTION
ALUMINIUM OXIDES
BORATES
BORON OXIDES
CADMIUM
CADMIUM FLUORIDES
CADMIUM OXIDES
CERAMICS
CHEMICAL COMPOSITION
DOPED MATERIALS
ERBIUM ADDITIONS
ERBIUM FLUORIDES
ERBIUM IONS
GLASS
LEAD FLUORIDES
LEAD OXIDES
MATRIX MATERIALS
NANOSTRUCTURES
NONLINEAR PROBLEMS
OXYFLUORIDES
SILICON OXIDES
SMALL ANGLE SCATTERING
TEMPERATURE RANGE 0400-1000 K
X RADIATION
X-RAY DIFFRACTION
YTTERBIUM ADDITIONS
YTTERBIUM FLUORIDES
YTTERBIUM IONS
ALLOYS
ALUMINIUM COMPOUNDS
BORON COMPOUNDS
CADMIUM COMPOUNDS
CADMIUM HALIDES
CHALCOGENIDES
CHARGED PARTICLES
COHERENT SCATTERING
DIFFRACTION
ELECTROMAGNETIC RADIATION
ELEMENTS
ERBIUM ALLOYS
ERBIUM COMPOUNDS
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
IONIZING RADIATIONS
IONS
LEAD COMPOUNDS
LEAD HALIDES
MATERIALS
METALS
OXIDES
OXYGEN COMPOUNDS
OXYHALIDES
RADIATIONS
RARE EARTH ADDITIONS
RARE EARTH ALLOYS
RARE EARTH COMPOUNDS
SCATTERING
SILICON COMPOUNDS
SORPTION
TEMPERATURE RANGE
YTTERBIUM COMPOUNDS