Max-Planck-Institut für Chemische Physik fester Stoffe, 01187 Dresden, Germany.
J Am Chem Soc. 2012 Aug 22;134(33):13558-61. doi: 10.1021/ja3055194. Epub 2012 Aug 9.
The new metastable binary silicides MSi(3) (M = Ca, Y, Lu) have been synthesized by high-pressure, high-temperature reactions at pressures between 12(2) and 15(2) GPa and temperatures from 900(100) to 1400(150) K. The atomic patterns comprise intricate silicon layers of condensed molecule-like Si(2) dimers. The alkaline-earth element adopts the oxidation state +2, while the rare-earth and transition metals realize +3. All of the compounds exhibit BCS-type superconductivity with weak electron-phonon coupling below critical temperatures of up to 7 K.
新的亚稳二元硅化物 MSi(3)（M = Ca、Y、Lu）已经通过在 12(2) 到 15(2) GPa 之间的压力和 900(100) 到 1400(150) K 的温度下的高压高温反应合成。原子模式包括复杂的凝聚分子状 Si(2) 二聚体的硅层。碱土元素采用+2 氧化态，而稀土和过渡金属则实现+3。所有化合物都表现出 BCS 型超导电性，在临界温度以下，电子-声子耦合较弱，最高可达 7 K。
