View Generic Document: Ternary Phase Diagram of the System Bi2O3-Fe2O3-Nb2O5
Citation:
Pazos, Ileana (2005). Ternary Phase Diagram of the System Bi2O3-Fe2O3-Nb2O5. National Institute of Standards and Technology, Technology Administration, U.S. Department of Commerce..
Subsolidus phase equilibria was studied to find the ternary phase diagram of the Bi2O3-Fe2O3-Nb2O5 system. This system has compounds that are reported to exhibit interesting
dielectric and magnetic properties. Compositions were chosen, then Bi2O3, Fe2O3 and Nb2O5 were accurately weighed and ground together. To equilibrate, samples were heated and ground three or more
times until they were fully reacted. Between heatings, small portions of the samples were taken for x-ray powder diffraction analysis. When the x-ray powder diffraction patterns appeared unchanged,
it was determined that the compounds reached equilibrium. The peaks in the patterns indicate what compounds are present in the sample. With data from several samples, regions are identified as
single, two and three phased. Particularly interesting was the region of single-phase pyrochlore found near the center of the ternary diagram. One such composition was chosen and a larger batch was
synthesized to measure properties. Pyrochlore, in this system, has unusual structural features. An accurate ternary phase diagram provides information to those interested in reproducing
compositions found that have useful properties.
Publisher
National Institute of Standards and Technology, Technology Administration, U.S. Department of Commerce.
Guest - January 07, 2009
View Generic Document: Ternary Phase Diagram of the System Bi2O3-Fe2O3-Nb2O5 