Premium
Formation of Metastable Fluorite Phase by Rapid Quenching of Melts in the Y 2 O 3 ‐Ta 2 O 5 System
Author(s) -
Yokota Osamu,
Yashima Masatomo,
Yamamoto Naoki,
Yoshimura Masahiro
Publication year - 1997
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1997.tb03138.x
Subject(s) - fluorite , metastability , solid solution , rietveld refinement , crystallography , homogeneous , quenching (fluorescence) , lattice (music) , phase (matter) , analytical chemistry (journal) , materials science , lattice constant , chemistry , diffraction , crystal structure , thermodynamics , physics , metallurgy , fluorescence , organic chemistry , chromatography , acoustics , optics , quantum mechanics
Melts of x mol% Ta 2 O 5 –Y 2 O 3 (x = 0–32.5) were rapidly quenched to investigate the formation of metastable fluorite solid solutions. C‐type Y 2 O 3 , fluorite, and fergusonite phases existed in the compositional regions of 0 x 16, 8 x 32.5, and 27.5 x 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 2 O 5 content, strongly suggesting the formation of compositionally homogeneous metastable solid solutions. Ta 2 O 5 was almost insoluble into Y 2 O 3 at 1700°C in the equilibrium state.