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Journal of Dental Research
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*Compound via MeSH
*Substance via MeSH
Hazardous Substances DB
*COPPER, ELEMENTAL
*GOLD
*SILVER COMPOUNDS
*SILVER, ELEMENTAL
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Determination of the AuCu Superlattice Formation Region in Gold-Copper-Silver Ternary System

Tsutomu Uzuka

Department of Dental Materials Science, School of Dentistry, Tokyo Medical and Dental University, Tokyo 113, Japan

Yasuo Kanzawa

Department of Dental Materials Science, School of Dentistry, Tokyo Medical and Dental University, Tokyo 113, Japan

Katsuhiro Yasuda

Department of Dental Materials Science, School of Dentistry, Tokyo Medical and Dental University, Tokyo 113, Japan

The composition and temperature range of the AuCu-type superlattice formation in the Au-Cu-Ag ternary system was determined by X-ray powder diffraction. Four distinguishable phase transformations were detected, i.e., 1) {alpha} (disordered FCC phase) -> AuCu I, 2) {alpha} -> AuCu II, 3) {alpha} -> {alpha}1 (Cu-rich FCC phase) + {alpha} 2 (Ag-rich FCC phase), and 4) {alpha} -> AuCu3. The stable temperature range of the AuCu I-type superlattice was restricted to a lower temperature range by adding silver to stoichiometric and off-stoichiometric Au-Cu alloys. Depending on the increase in silver content, the co-existing region of the AuCu II-type superlattice and the silver-rich {alpha}2 phase extended to the lower temperature and over a wide composition range.

Journal of Dental Research, Vol. 60, No. 5, 883-889 (1981)
DOI: 10.1177/00220345810600050501
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