Nihon Kessho Kogaku Co., Ltd.

Mitsui Minings & Melting Co., Ltd.

Yusuke Shiro

Takafumi Yamazaki

Shingo Ide

Masao Sekiguchi

An oriented apatite-type oxide ion conductor includes a composite oxide expressed as A[TM]O, where A represents one or two or more elements selected from the group consisting of La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Be, Mg, Ca, Sr, and Ba, T represents an element including Si or Ge or both, and M represents one or two or more elements selected from the group consisting of B, Ge, Zn, Sn, W, and Mo, and where x is from &#x2212;1.00 to 1.00, y is from 0.40 to less than 1.00, and z is from &#x2212;3.00 to 2.00.

Oriented apatite type oxide ion conductor and method for producing same

A fluorite having all the more excellent laser durability compared to a conventional fluorite is provided. A fluorite is proposed, in which the standard deviation of the surface areas of the Voronoi regions in a diagram from a Voronoi decomposition of the distribution of etch-pits in the (111) plane is 6,000 &#x3bc;mor less, or, in which the standard deviation of the distances of the Delaunay edges in a diagram from a Delaunay decomposition of the distribution of etch-pits of the (111) plane is 80 &#x3bc;m or less.

Fluorite

A fluorite with excellent laser durability is provided by devising a heat-treatment method for CaFcrystal. A fluorite production method is proposed, wherein heat-treatment is carried out by providing, through compartment walls in the periphery of a fluorite crystal, a fluoride gas trap layer containing a fluoride gas-adsorbing material.

Fluorite production method

A fluorite having all the more excellent laser durability compared to a conventional fluorite is provided. A fluorite is proposed, in which the standard deviation of the surface areas of the Voronoi regions in a diagram from a Voronoi segmentation of the distribution of etch-pits in the (111) plane is 6,000 &#x3bc;mor less, or, in which the standard deviation of the distances of the Delaunay edges in a diagram from a Delaunay segmentation of the distribution of etch-pits of the (111) plane is 80 &#x3bc;m or less.

Growing community of inventors

Ageo, Japan

Yusuke Shiro