SOLID ION CONDUCTOR, SOLID ELECTROLYTE INCLUDING THE SAME, ELECTROCHEMICAL DEVICE INCLUDING THE SAME, AND PREPARATION METHOD THEREOF

A solid ion conductor including a garnet-type oxide represented by Formula 1, a solid electrolyte including the solid ion conductor, an electrochemical device including the ion conductor, and a method of preparing the ion conductor are disclosed. LiM1LaM2ZrM3M4OX Formula 1 In Formula 1, M1 is a monovalent cation, a divalent cation, a trivalent cation, or a combination thereof, M2 is a monovalent cation, a divalent cation, a trivalent cation, or a combination thereof, M3 is a divalent cation, a trivalent cation, a tetravalent cation, a pentavalent cation, a hexavalent cation, or a combination thereof, M4 is Ir, Ru, Mn, Sn, or a combination thereof, X is a monovalent anion, a divalent anion, a trivalent anion, or a combination thereof, and 6≤A≤8, 0≤B