Method of producing guest-free silicon clathrate, apparatus for producing guest-free silicon clathrate
[Problem] To improve productivity of guest-free silicon clathrates [Solution] A method of producing a guest-free silicon clathrate includes a synthesizing step of performing a heat treatment on a mixture containing Si as a material serving as a host and a material serving as a guest to synthesize a silicon clathrate compound; and a guest removing step of irradiating the silicon clathrate compound contained in a container with an electromagnetic wave to remove the guest while suctioning gas inside the container.
1. A method of producing a guest-free silicon clathrate, comprising:
a synthesizing step of performing a heat treatment on a mixture containing Si as a material serving as a host and a material serving as a guest to synthesize a silicon clathrate compound;
a stirring step of stirring the silicon clathrate compound contained in a container, performed by using a protrusion on an inner wall surface of the container;
a guest removing step of irradiating the silicon clathrate compound contained in the container with an electromagnetic wave from an outside of the container to remove the guest while suctioning gas inside the container and while rotating the container, wherein the container is made of transparent quartz glass; and
an adsorbing step of adsorbing the removed guest using a cooling member and an adsorbent.
2. The method of producing a guest-free silicon clathrate according to claim 1 , further comprising:
mixing the silicon clathrate compound and a Li source after the synthesizing step and synthesizing a silicon clathrate compound containing Li;
forming voids by removing Li from the silicon clathrate compound containing Li to obtain a silicon clathrate compound having the voids; and
performing the guest removing step on the silicon clathrate compound having the voids.