High-temperature X-ray study of the cubic-tetragonal diffusionless phase transition in the ZrO[sub 2]-ErO[sub 1. 5]system: II, temperature dependences of oxygen ion displacement and lattice parameter of compositionally homogeneous 12 mol% ErO[sub 1. 5]-ZrO[sub 2]

Journal Article · Mon Mar 01 00:00:00 EST 1993 · Journal of the American Ceramic Society; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1993.tb03655.x· OSTI ID:6050552

Yashima, Masatomo; Ishizawa, Nobuo; Yoshimura, Masahiro ^[1]

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1. Tokyo Inst. of Tech., Yokohama (Japan). Research Lab. of Engineering Materials

The tetragonal-to-cubic phase transition of rapidly quenched 12 mol% ErO[sub 1.5]-ZrO[sub 2] was investigated in situ using high-temperature X-ray diffraction. Rapid quenching of the melt yielded a small oxygen ion displacement and a small tetragonality, axial ratio c/a. Although the tetragonality of the as-quenched specimen increased with temperature up to about 1,000C, it became independent of temperature on cooling to room temperature from about 1,000C and reheating up to 1,000C. The tetragonality decreased continuously with temperature above 1,000C and became unity at about 1,400C. The atomic coordination z for the oxygen ion, which expresses the displacement from its ideal site in the fluorite-type structure, increased with temperature and became 1.4 at about 1,400C. The tetragonality increased with annealing time through a thermal activation, which could explain the compositional dependence of the tetragonality in rapidly quenched ZrO[sub 2]-RO[sub 1.5] samples (R = rare earths).

• OSTI ID: 6050552
• Journal Information: Journal of the American Ceramic Society; (United States), Vol. 76:3; ISSN 0002-7820
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ERBIUM OXIDES
CRYSTAL-PHASE TRANSFORMATIONS
ZIRCONIUM OXIDES
CUBIC LATTICES
EXPERIMENTAL DATA
OXYGEN
QUENCHING
RARE EARTH COMPOUNDS
SAMPLE PREPARATION
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 1000-4000 K
TETRAGONAL LATTICES
X-RAY DIFFRACTION
CHALCOGENIDES
COHERENT SCATTERING
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DATA
DIFFRACTION
ELEMENTS
ERBIUM COMPOUNDS
INFORMATION
NONMETALS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
SCATTERING
TEMPERATURE RANGE
TRANSITION ELEMENT COMPOUNDS
ZIRCONIUM COMPOUNDS
360202* - Ceramics
Cermets
& Refractories- Structure & Phase Studies