Kußmann D.

North A. C.

Abstract
               The YbAu2–x
                  Si
                     x
                   and CaAu2–x
                  Si
                     x
                   systems were studied by X-ray techniques in the range 0.7 ≤ x ≤ 1.3. The YbAuSi compound forms peritectically at 1478 K and is stable till 1168 K in its high-temperature form (EuAuGe type); below 1168 K the SrAgGe type occurs. No equiatomic compound exists in the Ca–Au–Si system. In the gold- and silicon-rich regions the two systems show similar structural behaviour: the gold-rich phases belong to the CeCu2 or the EuAuGe type, while the silicon-rich phases crystallize in the A1B2 type. The magnetic susceptibility at room temperature indicates the divalency of ytterbium in YbAuSi.</jats:p

New phases in the Yb–Au–Si and Ca–Au–Si systems

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