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首页> 外文期刊>Crystal growth & design >Pressure effects on the size of type-I and type-II Si-clathrates synthesized by spark plasma sintering
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Pressure effects on the size of type-I and type-II Si-clathrates synthesized by spark plasma sintering

机译：压力对通过火花等离子体烧结合成的I型和II型硅酸盐的尺寸的影响

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摘要

The crystallinity of clathrate-I Na_8Si_(46) and clathrate-II Na_(24)Si_(136) was investigated as a function of applied pressure and temperature employing spark plasma sintering. Na _8Si_(46) and Na_(24)Si_(136) with full Na and Si occupancies were obtained at 450 and 600 C, respectively. Microcrystalline powders were obtained at 60 MPa, and single crystals were obtained at 100 MPa. The size of the crystals increased with pressure for the clathrate-II Na _(24)Si_(136), while a threshold value in pressure separated microcrystalline and single-crystal clathrate-I Na_8Si_(46).
机译：利用火花等离子体烧结研究了包合物-I Na_8Si_（46）和包合物-II Na_（24）Si_（136）的结晶度与施加压力和温度的关系。分别在450和600 C下获得了Na和Si完全占据的Na _8Si_（46）和Na_（24）Si_（136）。在60MPa下获得微晶粉末，并且在100MPa下获得单晶。对于包合物II Na _（24）Si_（136），晶体的尺寸随着压力而增加，而压力的阈值将微晶和单晶包合物I Na_8Si_（46）分开。

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