Abstract: This composite titanium oxide compound is a composite titanium oxide compound wherein primary particles of an alkali metal titanate compound and primary particles of an alkaline earth metal titanate compound are joined to form secondary particles. The secondary particles have an average particle size of 1 to 80 ?m. When the concentration of elements in the secondary particles is analyzed, a region where the alkaline earth metal is detected covers 50% or more of the surface area in 3% or less of the total number of secondary particles.

Abstract: A titanium-niobium oxide achieves suppressed adulteration with TiO2 and Ti2Nb10O29 and suppressed growth of crystal grains, and an electrode and a lithium-ion secondary cell include such a titanium-niobium oxide. The titanium-niobium oxide contains less than 0.30 at % of an alkali metal element and at least one element selected from the group consisting of Al, Y, La, Ce, Pr, and Sm. A ratio of thea total atomic weight of Al, Y, La, Ce, Pr, and Sm to thea total atomic weight of Ti and Nb is equal to or more than 0.001.

Abstract: This composite titanium oxide compound is a composite titanium oxide compound wherein primary particles of an alkali metal titanate compound and primary particles of an alkaline earth metal titanate compound are joined to form secondary particles. The secondary particles have an average particle size of 1 to 80 ?m. When the concentration of elements in the secondary particles is analyzed, a region where the alkaline earth metal is detected covers 50% or more of the surface area in 3% or less of the total number of secondary particles.

Abstract: A noncrystalline composite alkali metal titanate composition which is chemically stable, outstanding in resistance to hygroscopicity and suited as base materials for friction materials. The said composition comprises at least 60 wt. % of an alkali metal titanate represented by the general formula M2O.nTiO2 wherein M is one or at least two alkali metal elements and n is a number of 1 to 4, and at least 10 wt. % of SiO2, M2O/SiO2 being equal to or less than 2.5. When desired, it is possible to incorporate into the composition an oxide of at least one element selected from the group consisting of B, Mg, Al, P, Ca and Zn, and/or an oxide of at least one element selected from the group consisting of V, Cr, Mn, Fe, Co, Ni, Cu, Y, Zr, Nb and Ba.

Abstract: A noncrystalline composite alkali metal titanate composition which is chemically stable, outstanding in resistance to hygroscopicity and suited as base materials for friction materials. The said composition comprises at least 60 wt. % of an alkali metal titanate represented by the general formula M2O.nTiO2 wherein M is one or at least two alkali metal elements and n is a number of 1 to 4, and at least 10 wt. % of SiO2, M2O/SiO2 being equal to or less than 2.5. When desired, it is possible to incorporate into the composition an oxide of at least one element selected from the group consisting of B, Mg, Al, P, Ca and Zn, and/or an oxide of at least one element selected from the group consisting of V, Cr, Mn, Fe, Co, Ni, Cu, Y, Zr, Nb and Ba.

Abstract: Particles of titanium compounds each containing crystals of at least two kinds of alkaline earth metal titanate compounds of the perovskite type represented by RTiO.sub.3 wherein R is an alkaline earth metal which crystals are joined together or joined to crystals of TiO.sub.2. The friction material having added thereinto the powder of such particles of titanium compounds shows a high coefficient of friction and a low abrasive property to adjoining materials.