At-temperature neutron diffraction investigation of the aging process in magnesia-partially-stabilized zirconia

Journal Article · Wed Nov 30 23:00:00 EST 1994 · Journal of the American Ceramic Society; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1994.tb04550.x· OSTI ID:6607379

Argyriou, D N ^[1]; Howard, C J ^[2]; Smith, R I ^[3]

---

1. Australian Nuclear Science and Technology Organization, Menai (Australia) Univ. of Technology, Sydney (Australia)
2. Australian Nuclear Science and Technology Organization, Menai (Australia)
3. Rutherford Appleton Lab., Chilton (United Kingdom). ISIS Facility

A time-resolved neutron powder diffraction technique has been used to follow the changes occurring during the aging of magnesia-partially-stabilized zirconia at 1,100 C. Through quantitative phase analyses it has been possible to follow the development with aging time of tetragonal zirconia and of the [delta]-phase (Mg[sub 2]Zr[sub 5]O[sub 12], related to cubic, but with ordered anion vacancies), both at the expense of cubic zirconia. Changes in lattice parameters have been attributed to the expulsion of MgO stabilizer from the tetragonal zirconia precipitates as the aging proceeds. The broadening of peaks in the neutron diffraction pattern suggests there is considerable strain in the tetragonal precipitates in the c-direction, which is the short dimension in these lenticular precipitates. On cooling, there is some transformation of tetragonal zirconia to the monoclinic and orthorhombic phases.

• OSTI ID: 6607379
• Journal Information: Journal of the American Ceramic Society; (United States), Journal Name: Journal of the American Ceramic Society; (United States) Vol. 77:12; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ALKALINE EARTH METAL COMPOUNDS
CHALCOGENIDES
COHERENT SCATTERING
CRYSTAL-PHASE TRANSFORMATIONS
DIFFRACTION
HEAT TREATMENTS
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
MECHANICAL PROPERTIES
MICROSTRUCTURE
NEUTRON DIFFRACTION
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
SCATTERING
TRANSITION ELEMENT COMPOUNDS
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES