✦ LIBER ✦

The amount of tin in the ?1 phase of dental amalgam

✍ Scribed by Johnson, L. B.

Publisher: John Wiley and Sons
Year: 1971
Tongue: English
Weight: 238 KB
Volume: 5
Category: Article
ISSN: 0021-9304
DOI: 10.1002/jbm.820050310

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✦ Synopsis

Spherical-particle Ag-Sn alloy powders containing 4.3, 8.3, 12.0, 15.4, 18.5, 21.4, and 24.1 atomic per cent Sn were obtained. Amalgams from these alloys were examined by x-ray diffraction and metdlography for the presence of the y 2 phase and the yl + p 1 phase t,ransformation. A single amalgam of the approximate composition of dental amalgam was prepared from a melt at, high temperature and pressure and likewise examined.

Results showed that the solubility of Sn in Ag-Hg is about 7 atoms of Sn per unit cell of the y phase. As clinically prepared, the y1 phase of dental amalgam contains, however, only about 5 atoms of Sn per unit cell. These 5 atoms, nevertheless, result in a very considerable stabilization of this phase due to the increase in its electron concentration.

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