| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing a II type silicon clathrate involving sodium stably in large quantities. SOLUTION: This method for producing a silicon clathrate includes a positive-pressure heating treatment step of heating a silicon wafer and Na in the mixed state at≤650°C to produce a compound comprising Si and Na, and a negative-pressure heating treatment step of heating the produced compound comprising Si and Na for one hour or longer at a temperature of≥300°C and≤450°C under a negative pressure of≤10<SP POS="POST">-2</SP>Pa. Na is preferably supplied so that the mole ratio to Si used for generating the silicon clathrate becomes >1.0. COPYRIGHT: (C)2013,JPO&INPIT |
