Bulletin of Materials Science

, Volume 21, Issue 1, pp 81–86 | Cite as

Preparation of tetragonal zirconia powders by a solid state reaction: Kinetics, phases and morphology

  • V V Mishra
  • A K Garg
  • D C Agrawal
Research Articles


Powders of tetragonal (t)ZrO2 have been prepared by a solid state reaction between sodium metazirconate and sodium metaphosphate. The reaction temperatures and times have been varied between 450 and 550°C and 5 and 75 h, respectively. Zirconia powder, mostly in thet andt′ phases, is obtained. The yield of ZrO2 powder increases monotonically with time at all reaction temperatures according to a phase boundary controlled kinetics. The fraction oft phase also increases with time at 450°C and 500°C but goes through a maximum at 550°C, the highest temperature employed. A maximum of 55% of the precursor monoclinic zirconia (used to prepare sodium meta zirconate) is converted tot phase at 500°C/75 h. The ZrO2 powder consists of crystallites of size 9–25 nm agglomerated into particles having average size between 2 and 4µm. The agglomerates have a breaking strength of 100 MPa. A hydrothermal treatment is found to break the agglomerates into smaller sizes. Grinding the powder in a mortar and pestle converts only 12% of thet phase into monoclinic, indicating that substantial fraction of the tetragonal phase is the non transformable varietyt′. Heating experiments also confirm this.


Tetragonal zirconia powder preparation solid state reaction 


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Copyright information

© the Indian Academy of Sciences 1998

Authors and Affiliations

  • V V Mishra
    • 1
  • A K Garg
    • 1
  • D C Agrawal
    • 1
  1. 1.Materials Science ProgrammeIndian Institute of TechnologyKanpurIndia

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