Formation of metastable fluorite phase by rapid quenching of melts in the Y{sub 2}O{sub 3}-Ta{sub 2}O{sub 5} system

Journal Article · Mon Sep 01 04:00:00 EDT 1997 · Journal of the American Ceramic Society

OSTI ID:554026

Yokota, Osamu; Yashima, Masatomo; Yoshimura, Masahiro ^[1]; Yamamoto, Naoki ^[2]

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1. Tokyo Inst. of Tech., Midori, Yokohama (Japan)
2. Tokyo Inst. of Tech., Meguro, Tokyo (Japan). Dept. of Physics

Melts of x mol% Ta{sub 2}O{sub 5}-Y{sub 2}O{sub 3} (x = 0--32.5) were rapidly quenched to investigate the formation of metastable fluorite solid solutions. C-type Y{sub 2}O{sub 3}, fluorite, and fergusonite phases existed in the compositional regions of 0 {le} x {le} 16, 8 {le} x {le} 32.5, and 27.5 {le} x {le} 32.5, respectively. Their lattice parameters were precisely measured through either Rietveld analysis or a least-squares fit of the individual X-ray diffraction peak positions. The lattice parameter of the fluorite phase decreased linearly with increasing Ta{sub 2}O{sub 5} content, strongly suggesting the formation of compositionally homogeneous metastable solid solutions. Ta{sub 2}O{sub 5} was almost insoluble into Y{sub 2}O{sub 3} at 1,700 C in the equilibrium state.

• OSTI ID: 554026
• Journal Information: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 9 Vol. 80; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CHEMICAL COMPOSITION
LATTICE PARAMETERS
PHASE STUDIES
QUENCHING
SOLID SOLUTIONS
SOLIDIFICATION
TANTALUM OXIDES
TEMPERATURE RANGE 1000-4000 K
X-RAY DIFFRACTION
YTTRIUM OXIDES