A mixed conductor represented by Formula 1:
A.sub.4±xTi.sub.5−yG.sub.zO.sub.12−δ  Formula 1 wherein, in Formula 1, A is a monovalent cation, G is at least one of a monovalent cation, a divalent cation, a trivalent cation, a tetravalent cation, a pentavalent cation, or a hexavalent cation, with the proviso that G is not Ti or Cr, wherein 0<x<2, 0.3<y<5, 0<z<5, and 0<δ≤3.

An inorganic oxide of the present invention has a composition represented by General formula (1): M.sub.2LnX.sub.2(AlO.sub.4).sub.3 (where M includes Ca, Ln includes Tb, and X includes at least either one of Zr and Hf). Then, a number of Tb atoms in General formula (1) is 0.1 or more to 1 or less. Moreover, a crystal structure of the inorganic oxide is a garnet structure. A phosphor made of this inorganic oxide is capable of being excited by short-wavelength visible light, and can radiate narrow-band green light.

At least partial substitution of zirconium by hafnium in ion-conducting zirconium-based ceramics provides enhanced chemical stability in alkaline and acid environments.

A solid ion conductor compound includes a compound represented by Formula 1:

Li.sub.6−wHf.sub.2−xM.sub.xO.sub.7−yZ.sub.y  Formula 1

where, in Formula 1, M is an element having an oxidation number of a and a is 5, 6, or a combination thereof, Z is an element having an oxidation number of −1, and 0<x<2, 0≤y≤2, and 0<w<6 and w=[(a−4)×x]+y.

Provided is a method for forming a ferroelectric film of a metal oxide having a fluorite-type structure at a low temperature of lower than 300° C., and a ferroelectric film obtained at a low temperature. The present invention provides a production method of a ferroelectric film comprising a crystalline metal oxide having a fluorite-type structure of an orthorhombic crystal phase, which comprises using a film sputtering method comprising sputtering a target at a substrate temperature of lower than 300° C., to deposit on the substrate a film of a metal oxide which is capable of having a fluorite-type structure of an orthorhombic crystal phase, and having a subsequent thermal history of said film of lower than 300° C.; or applying an electric field to said film after said deposition or after said thermal history of lower than 300° C. Also provided are the ferroelectric film, which is formed on an organic substrate, glass, or metal substrate, which can be used only at low temperatures, and a ferroelectric element and a ferroelectric functional element or device using the ferroelectric film.

An electronic device comprises a first blocking electrode; a second blocking electrode; and a dielectric material disposed between the first electrode and the second electrode, the dielectric material comprising a compound of Formula 1

Li.sub.24-b*y-c*z-a*xM.sup.1.sub.yM.sup.2.sub.zM.sup.3.sub.xO.sub.12-δ  (1)

wherein M.sup.1 is a cationic element having an oxidation state of b, wherein b is +1, +2, +3, +4, +5, +6, or a combination thereof; M.sup.2 is a cationic element having an oxidation state of c, wherein c is +1, +2, +3, +4, +5, +6, or a combination thereof; M.sup.3 is a cationic element having an oxidation state of a, wherein a is +1, +3, +4, or a combination thereof; 0≤y≤3; 0≤z≤3; 0≤x≤5; and 0≤δ≤2. Methods for the manufacture of the electronic device are also disclosed.

A compound of Formula 1

Li.sub.1+(4−a)αHf.sub.2−αM.sup.a.sub.α(PO.sub.4−δ).sub.3  (1)

is disclosed, wherein M is at least one cationic element having a valence of a, wherein 0<α≤⅔, 1≤a≤4, and 0≤δ≤0.1. Also described are an electrolyte composition, a separator, a protected positive electrode, a protected negative electrode, and a lithium battery, each including the compound of Formula 1.

Described are a solid material which has ionic conductivity for lithium ions, a composite comprising said solid material and a cathode active material, a process for preparing said solid material, a solid structure selected from the group consisting of a cathode, an anode and a separator for an electrochemical cell comprising the solid material, and an electrochemical cell comprising such solid structure.

Disclosed is a solid state electrolyte comprising a compound of Formula 1
Li.sub.7−a*α−(b−4)*β−xM.sup.a.sub.αLa.sub.3Hf.sub.2−βM.sup.b.sub.βO.sub.12−x−δX.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, 0≤α≤5, otherwise 0≤α≤0.75, and wherein 0≤β≤1.5, 0≤x≤1.5, and (a*α+(b−4)β+x)>0, 0≤δ≤1.

Provided is a solid electrolyte material represented by the following composition formula (1)
Li.sub.3−3δ−aY.sub.1+δ−aM.sub.aCl.sub.6−x−yBr.sub.xI.sub.y  Formula (1) where M is one or more kinds of elements selected from the group consisting of Zr, Hf, and Ti; −1<δ<2; 0<a<1.5; 0<(3−3δ−a); 0<(1+δ−a); 0≤x≤6; 0≤y≤6; and (x+y)≤6.