Synthesis and Structural Characterization of Single-Crystal K7.5Si46 and K17.8Si136 Clathrates
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https://figshare.com/articles/dataset/Synthesis_and_Structural_Characterization_of_Single_Crystal_K_sub_7_5_sub_Si_sub_46_sub_and_K_sub_17_8_sub_Si_sub_136_sub_Clathrates/2607019
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Selective single-crystal growth of clathrate-I K7.5Si46 and clathrate-II K17.8Si136 was achieved from the precursor K4Si4 by reaction of the vapor phase with spatially separated graphite in a closed volume under pressure. K7.5Si46 was prepared at a temperature of 550 °C, and K17.8Si136 was prepared at 625 °C. Structural properties of both compositions were investigated using single-crystal X-ray diffraction. We compare the structural features of K7.5Si46 and K17.8Si136 with that of Na8Si46 and Na24Si136. A Na14.7Si136 single-crystal was also synthesized and used for comparison with K17.8Si136. K@Si28 was best refined in the center of the Si28 polyhedron for K17.8Si136, in contrast to the off-center refinement of Na@Si28 for NaxSi136.
创建时间：
2016-02-22
