Metastable tetragonal zirconia in porous powder aggregates
Micron-sized aggregate particles composed of nanosized primary particles are conveniently prepared by chemical methods of the sol-gel type. For pure zirconia, such aggregates often consist of the metastable tetragonal phase at temperatures up to about 500 C, instead of the thermodynamically more stable monoclinic phase. Surface energy considerations can explain the stability of large crystals of t-ZrO(2) within aggregates; a simple generic model is proposed for the microtexture of the aggregate structure to demonstrate this. This model can also explain the large discrepancies sometimes found in practice between XRD and TEM measurements of crystal size in zirconia.
Bibliographic Reference: Paper presented: 4th European Ceramics Society Conference, Riccione (IT), October 2-6, 1995
Availability: Available from (1) as Paper EN 39110 ORA
Record Number: 199511099 / Last updated on: 1995-08-22
Original language: en
Available languages: en