| abstract |
And is one aspect of the present invention, at least one inorganic composition containing the M element and Al element and silicon, oxygen, and nitrogen, wherein the inorganic composition has particles having a crystal phase of two at least, the crystalline phase of said at least two of the M 2 A first crystal phase identical to the SiO 4 crystal, and a second crystal phase that is a β-sialon crystal. Here, M may be at least one element selected from the group consisting of Mg, Ca, Sr, and Ba. |