Crystal growth of quasicrystal and partial phase diagram involving quasicrystal in the Ag-In-Yb system

摘要

An isothermal section of the partial Ag-In-Yb phase diagram, involving the icosahedral quasicrystalline (i-QC) phase and its corresponding 2/1 and 1/1 approximants (AP) at 823 K, has been determined. The i-QC, 2/1 and 1/1 AP exist in the compositional region around Ag42In42Yb16, Ag41In44Yb15 and Ag40In46Yb14, respectively. In a way similar to the Cd-Yb system, the i-QC in the present system forms congruently from the melt at around 890 K. On the basis of the phase diagram, a large single grain of i-QC with a diameter of 10 mm was obtained by using the Bridgman method.