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Stability of the Ag42In42Ca16 Icosahedral Quasicrystal and Its 2/1 Cubic Approximant |
DENG Binbin; GUO Kexin |
Key Laboratory of Electron Microscopy; Institute of Physics; The Chinese Academy of Sciences; Beijing 100080 |
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Cite this article:
DENG Binbin; GUO Kexin. Stability of the Ag42In42Ca16 Icosahedral Quasicrystal and Its 2/1 Cubic Approximant. Acta Metall Sin, 2004, 40(2): 120-124 .
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Abstract The simple cubic Ag42In45Ca13 (Pa3,
a=2.496 nm), which is the 2/1 crystalline approximant of the
Ag42In42Ca16 icosahedral quasicrystal, has been
found as the dominant phase in the ternary Ag3In3Ca
alloy. Its close structural relation to the
Ag42In42Ca16 icosahedral quasicrystal was shown
by means of SAED (selected area electron diffraction). The
decomposition of the cubic Ag42In45Ca13 after
annealing or exposure in air was studied using EDS (energy
dispersive X-ray spectroscopy), EELS (electron energy loss
spectroscopy) and powder X-ray diffraction. Thin foils of the
Ag3In3Ca alloy are easily oxidized in air and the
product contains Ca, O and some C. In block samples of the
Ag3In3Ca alloy exposed to air for 14 d, the cubic
Ag42In45Ca13 gradually decomposes, while the
amount of the binary AgIn2 and In4Ag9 phases
increases. On the other hand, the Ag42In42Ca16
icosahedral quasicrystal is stable both chemically and
structurally under the same conditions.
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Received: 20 June 2003
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[1] Tsai A P, Guo J Q, Abe E, Takakura H, Sato T J. Nature, 2000; 408: 537 [2] Guo J Q, Abe E, Tsai A P. Phys Rev, 2000; 62B: R14605 [3] Guo J Q, Tsai A P. Philos Mag Lett, 2002; 82: 349 [4] Gmez C P, Lidin S. Angew Chem Int Ed, 2001; 40(21) : 4037 [5] Takakura H, Guo J Q, Tsai A P. Philos Mag Lett, 2001; 81: 411 [6] Deng B B, Kuo K H (Guo K X). J Alloy Compd, in press [7] Ahn C C, Krivanek O L. EELS Atlas. Warrendale: Gatan, Inc., 1983 |
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