Transactions of the INDIAN CERAMIC SOCIETY Vol. 59 2000
Phase Transformation of Sol-Gel Derived Zr02-2RE203
(RE = Sm, Gd and Dy) Spun Fibres by Ageing
in Humid Atmosphere
M. K. Naskar, M. Chatterjee and D. Ganguli Pages : 37-40
DOI : 10.1080/0371750X.2000.10799905
Abstract
Zirconia fibres doped with 2 equivalent mol% of RE20 3 (RE =
Sm, Gd and Dy) were prepared by spinning of acetate derived
sols followed by calcination of the gel fibres thus obtained at
900°·1300°C for 1 h. The oxide fibres were characterized by X-ray
diffraction (XRD) analysis. The fibres containing only tetragonal
(t) phase were aged under controlled humidity at 150°-300°C for
8 h and in addition at 200°C for 2 and 5 h. The aged samples
were then characterized by XRD analysis. Dy3•-doped zirconia
showed the maximum tendency to undergo phase transformation
from tetragonal (t) to monoclinic (m) phase because of its
increased tendency for hydrolysis.
