NOVELTY - Ion conducting membrane comprises two phases that form continuous structures from a first side of the membrane to a second side of the membrane. The two phases are capable of conducting first and second type of ions, respectively.    USE - The membrane is used for separating molecules, e.g. carbon dioxide, steam, chlorides, nitrates, ammonium, and/or sulfur oxides from other molecules. It is used in solid oxide fuel cell and power plant, e.g. zero-emission coal-based electric power plant. It is used to separate carbon dioxide from a mixture comprising carbon dioxide and hydrogen, oxygen, carbon monoxide, nitrogen, methane, and/or steam, or from a fuel gas or an exhaust gas. (All claimed)    ADVANTAGE - The inventive membrane is capable of separating carbon dioxide at 200-1200 (preferably 400-1000)degreesC. It is readily available for power plant that relies on the recirculation of only partially combusted or oxidized flue gases. It increases the efficiency of recirculating the remaining gas if the gas can retain its sensible heat and does not have to be subjected to a cooling and heating cycle to allow removal of carbon dioxide. The zero emission power plants avoid smoke stacks by limiting the inputs to oxygen and carbonaceous fuels. It allows for a simple recovery of carbon dioxide in fuel gas streams. Most hydrocarbon gasification scheme to produce a hydrogen rich fuel makes use of the water gas shift reaction.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for:    (1) method for separating a molecule from other molecules comprising contacting a source of the molecules and other molecules to side(s) of the membrane; and    (2) method for producing the membrane comprising casting a mixture of particle(s) of the first phase and poreformer(s) to obtain a green body, sintering the green body to obtain a porous continuous structure having the first phase, and filling the pores of the porous continuous structure with a material capable of conducting the second type of ions.    DESCRIPTION OF DRAWING(S) - The figure is a schematic diagram exhibiting the structure of carbon dioxide (CO2) separating membrane.