Influence of bismuth on cordierite polymorphism

J. E. Fiscina; M. T. Malachevsky; F. Soldera; J. A. Vivas Hohl; D. A. Esparza

doi:10.1117/12.375448

25 January 2000 Influence of bismuth on cordierite polymorphism

J. E. Fiscina, M. T. Malachevsky, F. Soldera, J. A. Vivas Hohl, D. A. Esparza

Proceedings Volume 4064, Third International Workshop on Nondestructive Testing and Computer Simulations in Science and Engineering; (2000) https://doi.org/10.1117/12.375448
Event: Third International Workshop on Nondestructive Testing and Computer Simulations in Science and Engineering, 1999, St. Petersburg, Russian Federation

Abstract

Synthesis of Cordierite was carried out by solid state reaction sintering of oxides and Andean mineral precursors. Strong mechanic mixing was employed, with and without bismuth oxide added as a flux. Powder x-ray diffraction patterns were taken after sintering at different temperatures, in the range from 900 degree(s)C to 1400 degree(s)C. A comparative analysis was performed to investigate the phase formation dynamics for compositions with bismuth contents of 0, 5 and 13 %wt Bi₂O₃. Hexagonal (alpha) -Cordierite was obtained after sintering at 930 degree(s)C under the appropriate conditions. The behavior of the distortion index (Delta) with the sintering temperature reveals how the cordierite order-disorder polymorphism is affected by the bismuth addition. The resultant structure became more ordered with increasing sintering temperature. From the distortion index behavior and DTA measurements it can be observed that all the thermal events are shifted to lower temperatures for increasing bismuth contents. A preliminary study on sintering kinetics is presented from dilatometric measurements. The addition of bismuth would act as a catalyzer, through a liquid phase sintering process, by increasing the reaction rate and lowering the diffusion barriers.

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J. E. Fiscina, M. T. Malachevsky, F. Soldera, J. A. Vivas Hohl, and D. A. Esparza "Influence of bismuth on cordierite polymorphism", Proc. SPIE 4064, Third International Workshop on Nondestructive Testing and Computer Simulations in Science and Engineering, (25 January 2000); https://doi.org/10.1117/12.375448

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KEYWORDS

Bismuth

Distortion

Oxides

Temperature metrology

X-ray diffraction

Solid state physics

Crystals

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