Layered titanic acid, lamellar titanic acid, lamellar titanium oxide and method for producing lamellar titanic acid

多层状钛酸，其特征在于：它由通式为A#-[x]M#-[y]□#-[z]Ti#-[2-(y+z)]O#-[4]，其中A和/或M为不同金属，它们的化合价各为1-3，□表示Ti所占的缺陷位，x为正的实数，它满足0＜x＜1.0，y和z各自为正的实数，它们满足0＜y+z＜1.0的多层状钛酸盐经酸处理，使其中40-99％的A和/或M离子被氢离子或水合氢离子取代的方法而制得；层状钛酸，其特征在于：使多层状钛酸与碱性化合物反应将多层状钛酸解层的方法而制得；层状二氧化钛，其特征在于：将所述层状钛酸经热处理一类方法而制得。 A layered titanic acid, characterized in that it is produced by a method comprising subjecting a layered titanate represented by a general formula: AxMy &squ& zTi2-(y+z)O4, wherein A and M represent metals having a valence of 1 to 3 and being different from each other, &squ& represents a defect to be occupied by titanium, x is a positive and real number satisfying 0 < x < 1.0, y and z are positive and real numbers satisfying 0 < y+z < 1.0, to an acid treatment, to thereby substitute hydrogen ions or hydronium ions for 40 to 99 % of A and/or M ions; a lamellar titanic acid, characterized in that it is produced by a method comprising reacting the layered titanic acid with a basic compound, to thereby delaminate the layered titanic acid; and a lamellar titanium oxide, characterized in that it is produced by a method comprising subjecting the lamellar titanic acid to a heat treatment or the like.