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Thermal and optical properties of glass and crystalline phases formed in the binary R2O3-Al2O3 (R = La-Lu and Y) system
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View: Figures


Image of FIG. 1.
FIG. 1.

Schematic diagram of aerodynamic levitator. A high speed video camera and pyrometer were used to measure solidification and temperature on sample surface.

Image of FIG. 2.
FIG. 2.

Temperature-time profile recorded during undercooling and solidification of RAlO samples. Snap shots taken using high speed video camera clearly show formation of glass and crystalline phase. (a) NdAlO glass and (b) GdAlO crystal.

Image of FIG. 3.
FIG. 3.

Typical cooling curves of rapidly solidified RAlO samples recorded using single color pyrometer at 120 Hz. Arrows indicate nucleation ( ) and post-recalescence ( ) temperatures.

Image of FIG. 4.
FIG. 4.

solidification behavior of RAlO samples (R = Gd, Y, Ho, Er, and Lu) captured using color high-speed video camera at 1 kHz. Frames taken at 1 ms and elapsed time indicated at top left of photograph.

Image of FIG. 5.
FIG. 5.

RAlO glass (R = La–Sm) and crystalline samples (R = Eu–Lu and Y) formed directly from undercooled melt. Open and filled circles indicate vitrification and crystallization, respectively. Inset shows spherical La, Nd, and Sm glasses approximately 2.5 mm in diameter.

Image of FIG. 6.
FIG. 6.

(a) Thermal stability of RAlO (R = La, Nd, and Sm) glasses measured by differential scanning calorimetry. Filled squares and circles represent glass transition temperature, , and crystallization onset temperature, , respectively. (b) and as a function of ionic radius of rare-earth elements and (c) temperature difference, Δ (= ) of RAlO glass (filled triangle).

Image of FIG. 7.
FIG. 7.

Refractive index of RAlO (La, Nd, and Sm) glasses at 589 nm.

Image of FIG. 8.
FIG. 8.

Transmittance spectrum of RAlO glass in UV-visible region. Apparent peaks at 460 and 630 nm are irrelevant signals in spectral calibration.

Image of FIG. 9.
FIG. 9.

(a) Densities and (b) molar volumes of RAlO glasses (R = La, Nd, and Sm) as a function of rare-earth element ionic radius.

Image of FIG. 10.
FIG. 10.

X-ray diffraction spectra of as-solidified RAlO samples (R = Gd, Y, Ho, Er, and Lu) measured over 2θ range of 5°–80° with step width of 0.02°.

Image of FIG. 11.
FIG. 11.

Cross-sectional scanning electron microscopy microstructure images of as-solidified RAlO samples (R = Gd, Y, Ho, and Lu).


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Thermal and optical properties of glass and crystalline phases formed in the binary R2O3-Al2O3 (R = La-Lu and Y) system