Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Densification of Nanostructured Alumina Assisted by Rapid Nucleation of (Alpha)-Alumina



V R. Palkar, D Thapa, M S. Multani, S G. Malghan


We have shown that it is possible to achieve dense nanostructured alumina, with density + 98% of the theoretical maximum at sintering temperature as low as 1300 C without any help of additives of Α-seeding. The drastic reduction in sintering temperature from 1600 C to 1300 C is possible by rapid nucleation of the stable Α-alumina phase. It is achieved by introducing the compacted pellet of bayrite fine particles derived by the sol-gel process, in a furnace at 1250 C, the temperature high enough for the rapid transformation to Α-alumina. Since the nucleation rate is higher than the growth rate of particles, large and extensive pore network which usually develops during the sequential transformation to Α-Al2O3 could be avoided. This newly developed cost effective simple process of sintering through rapid nucleation will help to fulfill the demand of highly sintered nanostructured alumina for various industrial applications.
Materials Letters


alumina, nanostructured, nanostructured alumina, phase transformation, sintering, sol-gel


Palkar, V. , Thapa, D. , Multani, M. and Malghan, S. (1998), Densification of Nanostructured Alumina Assisted by Rapid Nucleation of (Alpha)-Alumina, Materials Letters (Accessed July 19, 2024)


If you have any questions about this publication or are having problems accessing it, please contact

Created December 31, 1997, Updated October 12, 2021