Provided is a solid electrolyte material represented by the following composition formula (1)

Li.sub.33aY.sub.1+aM.sub.aCl.sub.6xyBr.sub.xI.sub.yFormula (1) where M is one or more kinds of elements selected from the group consisting of Zr, Hf, and Ti; 1<<2; 0<a<1.5; 0<(33a); 0<(1+a); 0x6; 0y6; and (x+y)6.

A compound of Formula 1:
Li.sub.6+(4a)x+c)M.sup.4+.sub.(2x)A.sup.a+.sub.xO.sub.(7c)N.sub.c(1)
wherein M is a tetravalent cationic element, A is a divalent or trivalent cationic element, N is an anion having a valence of less than 2, wherein when A is Y.sup.3+, In.sup.3+, Zn.sup.2+, or a combination thereof, 0.15<x0.5, otherwise 0x0.5, 0c2, and ((4a)x+c)>0.

Preparation of semiconductor nanocrystals and their dispersions in solvents and other media is described. The nanocrystals described herein have small (1-10 nm) particle size with minimal aggregation and can be synthesized with high yield. The capping agents on the as-synthesized nanocrystals as well as nanocrystals which have undergone cap exchange reactions result in the formation of stable suspensions in polar and nonpolar solvents which may then result in the formation of high quality nanocomposite films.

Disclosed is a solid state electrolyte comprising a compound of Formula 1

Li.sub.7a*(b4)*xM.sup.a.sub.La.sub.3Hf.sub.2M.sup.b.sub.O.sub.12xX.sub.x (1)

wherein M.sup.a is a cationic element having a valence of a+; M.sup.b is a cationic element having a valence of b+; and X is an anion having a valence of 1, wherein, when M.sup.a includes H, 05, otherwise 00.75, and wherein 01.5, 0x1.5, and (a*+(b4)+x)>0, 01.

The present invention relates to a mixed oxide of aluminium, of zirconium, of cerium, of lanthanum and optionally of at least one rare-earth metal other than cerium and lanthanum that makes it possible to prepare a catalyst that retains, after severe ageing, a good thermal stability and a good catalytic activity. The invention also relates to the process for preparing this mixed oxide and also to a process for treating exhaust gases from internal combustion engines using a catalyst prepared from this mixed oxide.

Provided are a sodium ion-conductive crystal-containing solid electrolyte sheet capable of giving excellent battery characteristics even when reduced in thickness, and an all-solid-state battery using the same. The solid electrolyte sheet contains at least one type of sodium ion-conductive crystal selected from -alumina and NASICON crystal and has a thickness of 500 m or less and a flatness of 200 m or less.

A compound of Formula 1

Li.sub.1+(4a)Hf.sub.2M.sup.a.sub.(PO.sub.4).sub.3(1)

wherein M is at least one cationic element with valence of a, wherein 0<, 1a4, and 00.1. Also an electrolyte composition, a separator, a protected positive electrode, a protected negative electrode, and a lithium battery, each including the compound of Formula 1.

Provided is a complex oxide that has a high hydrogen content, contains almost no impurity phase, and is suitable for proton conductivity. The complex oxide is represented by a chemical formula Li.sub.7-xH.sub.xLa.sub.3M.sub.2O.sub.12 (M represents Zr and/or Hf, and 3.2<x7) and is a single phase of a garnet type structure belonging to a cubic system. A method for producing the complex oxide includes an exchange step of bringing a raw material complex oxide represented by a chemical formula Li.sub.7-xH.sub.xLa.sub.3M.sub.2O.sub.12 (M represents Zr and/or Hf, and 0x3.2) and a compound having a hydroxy group or a carboxyl group into contact with each other to exchange at least some of lithium of the raw material complex oxide and hydrogen of the compound having a hydroxy group or a carboxyl group.

A mixed conductor represented by Formula 1:

A.sub.4+xM.sub.5-yM.sub.yO.sub.12-,Formula 1

wherein, in Formula 1, A is a monovalent cation, M is at least one of a divalent cation, a trivalent cation, or a tetravalent cation, M is at least one of a monovalent cation, a divalent cation, a trivalent cation, a tetravalent cation, a pentavalent cation, or a hexavalent cation, M and M are different from each other, and 0.3x<3, 0.01<y<2, and 01 are satisfied.

A perovskite material represented by Formula 1:

Li.sub.xA.sub.yM.sub.zO.sub.3-Formula 1 wherein in Formula 1, 0<x1, 0<y1, 0<x+y<1, 0<z1.5, 01, A is H, Na, K, Rb, Cs, Ca, Sr, Ba, Y, La, Ce, Pr, Nd, Pm, Sm, Gd, Tb, Dy, Ho, Er, or a combination thereof, and M is Ni, Pd, Pb, Fe, Ir, Co, Rh, Mn, Cr, Ru, Re, Sn, V, Ge, W, Zr, Mo, Hf, U, Nb, Th, Ta, Bi, Li, H, Na, K, Rb, Cs, Ca, Sr, Ba, Y, La, Ce, Pr, Nd, Pm, Sm, Gd, Tb, Dy, Ho, Er, Mg, Al, Si, Sc, Zn, Ga, Ag, Cd, In, Sb, Pt, Au, or a combination thereof.